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1078 lines
28 KiB
Plaintext
1078 lines
28 KiB
Plaintext
; IL65 definitions for the Commodore-64
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; Including memory registers, I/O registers, Basic and Kernel subroutines, utility subroutines.
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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; ;
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; indent format: TABS, size=8
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~ c64 {
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memory .byte SCRATCH_ZP1 = $02 ; scratch register #1 in ZP
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memory .byte SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
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memory .word SCRATCH_ZPWORD1 = $fb ; scratch word in ZP ($fb/$fc)
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memory .word SCRATCH_ZPWORD2 = $fd ; scratch word in ZP ($fd/$fe)
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memory .byte TIME_HI = $a0 ; software jiffy clock, hi byte
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memory .byte TIME_MID = $a1 ; .. mid byte
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memory .byte TIME_LO = $a2 ; .. lo byte. Updated by IRQ every 1/60 sec
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memory .byte STKEY = $91 ; various keyboard statuses (updated by IRQ)
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memory .byte SFDX = $cb ; current key pressed (matrix value) (updated by IRQ)
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memory .byte COLOR = $0286 ; cursor color
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memory .word CINV = $0314 ; IRQ vector
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memory .matrix(40, 25) Screen = $0400 ; default character screen matrix
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memory .matrix(40, 25) Colors = $d800 ; character screen colors
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; ---- VIC-II registers ----
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memory SP0X = $d000
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memory SP0Y = $d001
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memory SP1X = $d002
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memory SP1Y = $d003
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memory SP2X = $d004
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memory SP2Y = $d005
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memory SP3X = $d006
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memory SP3Y = $d007
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memory SP4X = $d008
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memory SP4Y = $d009
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memory SP5X = $d00a
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memory SP5Y = $d00b
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memory SP6X = $d00c
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memory SP6Y = $d00d
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memory SP7X = $d00e
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memory SP7Y = $d00f
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memory MSIGX = $d010
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memory SCROLY = $d011
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memory RASTER = $d012
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memory LPENX = $d013
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memory LPENY = $d014
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memory SPENA = $d015
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memory SCROLX = $d016
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memory YXPAND = $d017
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memory VMCSB = $d018
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memory VICIRQ = $d019
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memory IREQMASK = $d01a
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memory SPBGPR = $d01b
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memory SPMC = $d01c
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memory XXPAND = $d01d
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memory SPSPCL = $d01e
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memory SPBGCL = $d01f
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memory EXTCOL = $d020 ; border color
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memory BGCOL0 = $d021 ; screen color
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memory BGCOL1 = $d022
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memory BGCOL2 = $d023
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memory BGCOL4 = $d024
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memory SPMC0 = $d025
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memory SPMC1 = $d026
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memory SP0COL = $d027
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memory SP1COL = $d028
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memory SP2COL = $d029
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memory SP3COL = $d02a
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memory SP4COL = $d02b
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memory SP5COL = $d02c
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memory SP6COL = $d02d
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memory SP7COL = $d02e
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; ---- end of VIC-II registers ----
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; ---- C64 basic and kernal ROM float constants and functions ----
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; note: the fac1 and fac2 are working registers and take 6 bytes each,
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; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
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; constants in five-byte "mflpt" format in the BASIC ROM
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memory .float FL_PIVAL = $aea8 ; 3.1415926...
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memory .float FL_N32768 = $b1a5 ; -32768
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memory .float FL_FONE = $b9bc ; 1
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memory .float FL_SQRHLF = $b9d6 ; SQR(2) / 2
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memory .float FL_SQRTWO = $b9db ; SQR(2)
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memory .float FL_NEGHLF = $b9e0 ; -.5
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memory .float FL_LOG2 = $b9e5 ; LOG(2)
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memory .float FL_TENC = $baf9 ; 10
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memory .float FL_NZMIL = $bdbd ; 1e9 (1 billion)
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memory .float FL_FHALF = $bf11 ; .5
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memory .float FL_LOGEB2 = $bfbf ; 1 / LOG(2)
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memory .float FL_PIHALF = $e2e0 ; PI / 2
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memory .float FL_TWOPI = $e2e5 ; 2 * PI
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memory .float FL_FR4 = $e2ea ; .25
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; note: fac1/2 might get clobbered even if not mentioned in the function's name.
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; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
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; checked functions below:
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sub MOVFM (mflpt: AY) -> (A?, Y?) = $bba2 ; load mflpt value from memory in A/Y into fac1
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sub FREADMEM () -> (A?, Y?) = $bba6 ; load mflpt value from memory in $22/$23 into fac1
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sub CONUPK (mflpt: AY) -> (A?, Y?) = $ba8c ; load mflpt value from memory in A/Y into fac2
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sub FAREADMEM () -> (A?, Y?) = $ba90 ; load mflpt value from memory in $22/$23 into fac2
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sub MOVFA () -> (A?, X?) = $bbfc ; copy fac2 to fac1
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sub MOVAF () -> (A?, X?) = $bc0c ; copy fac1 to fac2 (rounded)
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sub MOVEF () -> (A?, X?) = $bc0f ; copy fac1 to fac2
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sub FTOMEMXY (mflpt: XY) -> (A?, Y?) = $bbd4 ; store fac1 to memory X/Y as 5-byte mflpt
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sub FTOSWORDYA () -> (Y, A, X?) = $b1aa ; fac1-> signed word in Y/A (might throw ILLEGAL QUANTITY)
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; use c64flt.FTOSWRDAY to get A/Y output (lo/hi switched to normal order)
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sub GETADR () -> (Y, A, X?) = $b7f7 ; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY)
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; (result also in $14/15) use c64flt.GETADRAY to get A/Y output (lo/hi switched to normal order)
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sub QINT () -> (?) = $bc9b ; fac1 -> 4-byte signed integer in 98-101 ($62-$65), with the MSB FIRST.
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sub AYINT () -> (?) = $b1bf ; fac1-> signed word in 100-101 ($64-$65) MSB FIRST. (might throw ILLEGAL QUANTITY)
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sub GIVAYF (lo: Y, hi: A) -> (?) = $b391 ; signed word in Y/A -> float in fac1
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; use c64flt.GIVAYFAY to use A/Y input (lo/hi switched to normal order)
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; there is also c64flt.GIVUAYF - unsigned word in A/Y (lo/hi) to fac1
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; there is also c64flt.FREADS32 that reads from 98-101 ($62-$65) MSB FIRST
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; there is also c64flt.FREADUS32 that reads from 98-101 ($62-$65) MSB FIRST
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; there is also c64flt.FREADS24AXY that reads signed int24 into fac1 from A/X/Y (lo/mid/hi bytes)
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sub FREADUY (ubyte: Y) -> (?) = $b3a2 ; 8 bit unsigned Y -> float in fac1
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sub FREADSA (sbyte: A) -> (?) = $bc3c ; 8 bit signed A -> float in fac1
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sub FREADSTR (len: A) -> (?) = $b7b5 ; str -> fac1, $22/23 must point to string, A=string length
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sub FPRINTLN () -> (?) = $aabc ; print string of fac1, on one line (= with newline)
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sub FOUT () -> (AY, X?) = $bddd ; fac1 -> string, address returned in AY ($0100)
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sub FADDH () -> (?) = $b849 ; fac1 += 0.5, for rounding- call this before INT
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sub MUL10 () -> (?) = $bae2 ; fac1 *= 10
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sub DIV10 () -> (?) = $bafe ; fac1 /= 10 , CAUTION: result is always positive!
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sub FCOMP (mflpt: AY) -> (A, X?, Y?) = $bc5b ; A = compare fac1 to mflpt in A/Y, 0=equal 1=fac1 is greater, 255=fac1 is less than
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sub FADDT () -> (?) = $b86a ; fac1 += fac2
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sub FADD (mflpt: AY) -> (?) = $b867 ; fac1 += mflpt value from A/Y
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sub FSUBT () -> (?) = $b853 ; fac1 = fac2-fac1 mind the order of the operands
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sub FSUB (mflpt: AY) -> (?) = $b850 ; fac1 = mflpt from A/Y - fac1
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sub FMULTT () -> (?) = $ba2b ; fac1 *= fac2
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sub FMULT (mflpt: AY) -> (?) = $ba28 ; fac1 *= mflpt value from A/Y
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sub FDIVT () -> (?) = $bb12 ; fac1 = fac2/fac1 mind the order of the operands
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sub FDIV (mflpt: AY) -> (?) = $bb0f ; fac1 = mflpt in A/Y / fac1
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sub FPWRT () -> (?) = $bf7b ; fac1 = fac2 ** fac1
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sub FPWR (mflpt: AY) -> (?) = $bf78 ; fac1 = fac2 ** mflpt from A/Y
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sub NOTOP () -> (?) = $aed4 ; fac1 = NOT(fac1)
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sub INT () -> (?) = $bccc ; INT() truncates, use FADDH first to round instead of trunc
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sub LOG () -> (?) = $b9ea ; fac1 = LN(fac1) (natural log)
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sub SGN () -> (?) = $bc39 ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
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sub SIGN () -> (A) = $bc2b ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
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sub ABS () -> () = $bc58 ; fac1 = ABS(fac1)
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sub SQR () -> (?) = $bf71 ; fac1 = SQRT(fac1)
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sub EXP () -> (?) = $bfed ; fac1 = EXP(fac1) (e ** fac1)
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sub NEGOP () -> (A?) = $bfb4 ; switch the sign of fac1
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sub RND () -> (?) = $e097 ; fac1 = RND() (use RNDA instead)
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sub RNDA (A) -> (?) = $e09a ; fac1 = RND(A)
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sub COS () -> (?) = $e264 ; fac1 = COS(fac1)
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sub SIN () -> (?) = $e26b ; fac1 = SIN(fac1)
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sub TAN () -> (?) = $e2b4 ; fac1 = TAN(fac1)
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sub ATN () -> (?) = $e30e ; fac1 = ATN(fac1)
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; ---- C64 basic routines ----
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sub CLEARSCR () -> (?) = $E544 ; clear the screen
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sub HOMECRSR () -> (?) = $E566 ; cursor to top left of screen
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; ---- end of C64 basic routines ----
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; ---- C64 kernal routines ----
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sub IRQDFRT () -> (?) = $EA31 ; default IRQ routine
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sub IRQDFEND () -> (?) = $EA81 ; default IRQ end/cleanup
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sub CINT () -> (?) = $FF81 ; (alias: SCINIT) initialize screen editor and video chip
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sub IOINIT () -> (A?, X?) = $FF84 ; initialize I/O devices (CIA, SID, IRQ)
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sub RAMTAS () -> (?) = $FF87 ; initialize RAM, tape buffer, screen
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sub RESTOR () -> (?) = $FF8A ; restore default I/O vectors
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sub VECTOR (dir: SC, userptr: XY) -> (A?, Y?) = $FF8D ; read/set I/O vector table
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sub SETMSG (value: A) -> () = $FF90 ; set Kernal message control flag
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sub SECOND (address: A) -> (A?) = $FF93 ; (alias: LSTNSA) send secondary address after LISTEN
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sub TKSA (address: A) -> (A?) = $FF96 ; (alias: TALKSA) send secondary address after TALK
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sub MEMTOP (dir: SC, address: XY) -> (XY) = $FF99 ; read/set top of memory pointer
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sub MEMBOT (dir: SC, address: XY) -> (XY) = $FF9C ; read/set bottom of memory pointer
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sub SCNKEY () -> (?) = $FF9F ; scan the keyboard
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sub SETTMO (timeout: A) -> () = $FFA2 ; set time-out flag for IEEE bus
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sub ACPTR () -> (A) = $FFA5 ; (alias: IECIN) input byte from serial bus
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sub CIOUT (byte: A) -> () = $FFA8 ; (alias: IECOUT) output byte to serial bus
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sub UNTLK () -> (A?) = $FFAB ; command serial bus device to UNTALK
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sub UNLSN () -> (A?) = $FFAE ; command serial bus device to UNLISTEN
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sub LISTEN (device: A) -> (A?) = $FFB1 ; command serial bus device to LISTEN
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sub TALK (device: A) -> (A?) = $FFB4 ; command serial bus device to TALK
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sub READST () -> (A) = $FFB7 ; read I/O status word
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sub SETLFS (logical: A, device: X, address: Y) -> () = $FFBA ; set logical file parameters
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sub SETNAM (namelen: A, filename: XY) -> () = $FFBD ; set filename parameters
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sub OPEN () -> (?) = $FFC0 ; (via 794 ($31A)) open a logical file
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sub CLOSE (logical: A) -> (?) = $FFC3 ; (via 796 ($31C)) close a logical file
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sub CHKIN (logical: X) -> (A?, X?) = $FFC6 ; (via 798 ($31E)) define an input channel
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sub CHKOUT (logical: X) -> (A?, X?) = $FFC9 ; (via 800 ($320)) define an output channel
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sub CLRCHN () -> (A?, X?) = $FFCC ; (via 802 ($322)) restore default devices
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sub CHRIN () -> (A, Y?) = $FFCF ; (via 804 ($324)) input a character (for keyboard, read a whole line from the screen) A=byte read.
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sub CHROUT (char: A) -> () = $FFD2 ; (via 806 ($326)) output a character
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sub LOAD (verify: A, address: XY) -> (SC, A, X, Y) = $FFD5 ; (via 816 ($330)) load from device
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sub SAVE (zp_startaddr: A, endaddr: XY) -> (SC, A) = $FFD8 ; (via 818 ($332)) save to a device
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sub SETTIM (low: A, middle: X, high: Y) -> () = $FFDB ; set the software clock
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sub RDTIM () -> (A, X, Y) = $FFDE ; read the software clock
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sub STOP () -> (SZ, SC, A?, X?) = $FFE1 ; (via 808 ($328)) check the STOP key
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sub GETIN () -> (A, X?, Y?) = $FFE4 ; (via 810 ($32A)) get a character
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sub CLALL () -> (A?, X?) = $FFE7 ; (via 812 ($32C)) close all files
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sub UDTIM () -> (A?, X?) = $FFEA ; update the software clock
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sub SCREEN () -> (X, Y) = $FFED ; read number of screen rows and columns
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sub PLOT (dir: SC, col: Y, row: X) -> (X, Y) = $FFF0 ; read/set position of cursor on screen
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sub IOBASE () -> (X, Y) = $FFF3 ; read base address of I/O devices
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; ---- end of C64 kernal routines ----
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memory .word NMI_VEC = $FFFA ; nmi vector, set by the kernal if banked in
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memory .word RESET_VEC = $FFFC ; reset vector, set by the kernal if banked in
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memory .word IRQ_VEC = $FFFE ; interrupt vector, set by the kernal if banked in
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; ----- utility functions ----
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sub init_system () -> (?) {
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; ---- initializes the machine to a sane starting state
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; This means that the BASIC, KERNAL and CHARGEN ROMs are banked in,
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; the VIC, SID and CIA chips are reset, screen is cleared, and the default IRQ is set.
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; Also a different color scheme is chosen to identify ourselves a little.
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%asm {
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sei
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cld
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lda #%00101111
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sta $00
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lda #%00100111
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sta $01
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jsr c64.IOINIT
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jsr c64.RESTOR
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jsr c64.CINT
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lda #6
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sta c64.EXTCOL
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lda #7
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sta c64.COLOR
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lda #0
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sta c64.BGCOL0
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tax
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tay
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clc
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clv
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cli
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rts
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}
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}
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} ; ------ end of block c64
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~ c64flt {
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; ---- this block contains C-64 floating point related functions ----
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sub FREADS32 () -> (?) {
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; ---- fac1 = signed int32 from $62-$65 big endian (MSB FIRST)
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%asm {
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lda $62
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eor #$ff
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asl a
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lda #0
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ldx #$a0
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jmp $bc4f ; internal BASIC routine
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}
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}
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sub FREADUS32 () -> (?) {
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; ---- fac1 = uint32 from $62-$65 big endian (MSB FIRST)
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%asm {
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sec
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lda #0
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ldx #$a0
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jmp $bc4f ; internal BASIC routine
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}
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}
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sub FREADS24AXY (lo: A, mid: X, hi: Y) -> (?) {
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; ---- fac1 = signed int24 (A/X/Y contain lo/mid/hi bytes)
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; note: there is no FREADU24AXY (unsigned), use FREADUS32 instead.
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%asm {
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sty $62
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stx $63
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sta $64
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lda $62
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eor #$FF
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asl a
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lda #0
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sta $65
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ldx #$98
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jmp $bc4f ; internal BASIC routine
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}
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}
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sub GIVUAYF (uword: AY) -> (?) {
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; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
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%asm {
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sty $62
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sta $63
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ldx #$90
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sec
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jmp $bc49 ; internal BASIC routine
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}
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}
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sub GIVAYFAY (sword: AY) -> (?) {
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; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
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%asm {
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sta c64.SCRATCH_ZP1
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tya
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ldy c64.SCRATCH_ZP1
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jmp c64.GIVAYF ; this uses the inverse order, Y/A
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}
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}
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sub FTOSWRDAY () -> (AY, X?) {
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; ---- fac1 to signed word in A/Y
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%asm {
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jsr c64.FTOSWORDYA ; note the inverse Y/A order
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sta c64.SCRATCH_ZP1
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tya
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ldy c64.SCRATCH_ZP1
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rts
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}
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}
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sub GETADRAY () -> (AY, X?) {
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; ---- fac1 to unsigned word in A/Y
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%asm {
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jsr c64.GETADR ; this uses the inverse order, Y/A
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sta c64.SCRATCH_ZP1
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tya
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ldy c64.SCRATCH_ZP1
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rts
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}
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}
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sub copy_mflt (source: XY) -> (A?, Y?) {
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; ---- copy a 5 byte MFLT floating point variable to another place
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; input: X/Y = source address, c64.SCRATCH_ZPWORD1 = destination address
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%asm {
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stx c64.SCRATCH_ZP1
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sty c64.SCRATCH_ZPWORD1+1
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ldy #0
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lda (c64.SCRATCH_ZP1),y
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sta (c64.SCRATCH_ZPWORD1),y
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iny
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lda (c64.SCRATCH_ZP1),y
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sta (c64.SCRATCH_ZPWORD1),y
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iny
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lda (c64.SCRATCH_ZP1),y
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sta (c64.SCRATCH_ZPWORD1),y
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iny
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lda (c64.SCRATCH_ZP1),y
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sta (c64.SCRATCH_ZPWORD1),y
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iny
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lda (c64.SCRATCH_ZP1),y
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sta (c64.SCRATCH_ZPWORD1),y
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ldy c64.SCRATCH_ZPWORD1+1
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rts
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}
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}
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sub float_add_one (mflt: XY) -> (?) {
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; ---- add 1 to the MFLT pointed to by X/Y. Clobbers A, X, Y
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%asm {
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stx c64.SCRATCH_ZP1
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sty c64.SCRATCH_ZP2
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txa
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jsr c64.MOVFM ; fac1 = float XY
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lda #<c64.FL_FONE
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ldy #>c64.FL_FONE
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jsr c64.FADD ; fac1 += 1
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ldx c64.SCRATCH_ZP1
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ldy c64.SCRATCH_ZP2
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jmp c64.FTOMEMXY ; float XY = fac1
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}
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}
|
|
|
|
sub float_sub_one (mflt: XY) -> (?) {
|
|
; ---- subtract 1 from the MFLT pointed to by X/Y. Clobbers A, X, Y
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
lda #<c64.FL_FONE
|
|
ldy #>c64.FL_FONE
|
|
jsr c64.MOVFM ; fac1 = 1
|
|
txa
|
|
ldy c64.SCRATCH_ZP2
|
|
jsr c64.FSUB ; fac1 = float XY - 1
|
|
ldx c64.SCRATCH_ZP1
|
|
ldy c64.SCRATCH_ZP2
|
|
jmp c64.FTOMEMXY ; float XY = fac1
|
|
}
|
|
}
|
|
|
|
sub float_add_SW1_to_XY (mflt: XY) -> (?) {
|
|
; ---- add MFLT pointed to by SCRATCH_ZPWORD1 to the MFLT pointed to by X/Y. Clobbers A, X, Y
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
txa
|
|
jsr c64.MOVFM ; fac1 = float XY
|
|
lda c64.SCRATCH_ZPWORD1
|
|
ldy c64.SCRATCH_ZPWORD1+1
|
|
jsr c64.FADD ; fac1 += SCRATCH_ZPWORD1
|
|
ldx c64.SCRATCH_ZP1
|
|
ldy c64.SCRATCH_ZP2
|
|
jmp c64.FTOMEMXY ; float XY = fac1
|
|
}
|
|
}
|
|
|
|
sub float_sub_SW1_from_XY (mflt: XY) -> (?) {
|
|
; ---- subtract MFLT pointed to by SCRATCH_ZPWORD1 from the MFLT pointed to by X/Y. Clobbers A, X, Y
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
lda c64.SCRATCH_ZPWORD1
|
|
ldy c64.SCRATCH_ZPWORD1+1
|
|
jsr c64.MOVFM ; fac1 = SCRATCH_ZPWORD1
|
|
txa
|
|
ldy c64.SCRATCH_ZP2
|
|
jsr c64.FSUB ; fac1 = float XY - SCRATCH_ZPWORD1
|
|
ldx c64.SCRATCH_ZP1
|
|
ldy c64.SCRATCH_ZP2
|
|
jmp c64.FTOMEMXY ; float XY = fac1
|
|
}
|
|
}
|
|
|
|
} ; ------ end of block c64flt
|
|
|
|
|
|
|
|
~ c64scr {
|
|
; ---- this block contains (character) Screen and text I/O related functions ----
|
|
|
|
|
|
sub clear_screen (char:A, color: Y) -> () {
|
|
; ---- clear the character screen with the given fill character and character color.
|
|
; (assumes screen is at $0400, could be altered in the future with self-modifying code)
|
|
|
|
%asm {
|
|
sta _loop + 1 ; self-modifying
|
|
stx c64.SCRATCH_ZP1
|
|
ldx #0
|
|
_loop lda #0
|
|
sta c64.Screen,x
|
|
sta c64.Screen+$0100,x
|
|
sta c64.Screen+$0200,x
|
|
sta c64.Screen+$02e8,x
|
|
tya
|
|
sta c64.Colors,x
|
|
sta c64.Colors+$0100,x
|
|
sta c64.Colors+$0200,x
|
|
sta c64.Colors+$02e8,x
|
|
inx
|
|
bne _loop
|
|
|
|
lda _loop+1 ; restore A and X
|
|
ldx c64.SCRATCH_ZP1
|
|
rts
|
|
}
|
|
|
|
}
|
|
|
|
|
|
sub scroll_left_full (alsocolors: SC) -> (A?, X?, Y?) {
|
|
; ---- scroll the whole screen 1 character to the left
|
|
; contents of the rightmost column are unchanged, you should clear/refill this yourself
|
|
; Carry flag determines if screen color data should be scrolled too
|
|
%asm {
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Colors + 40*row + 1,x
|
|
sta c64.Colors + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Colors + 40*row + 1,x
|
|
sta c64.Colors + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
_scroll_screen
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Screen + 40*row + 1,x
|
|
sta c64.Screen + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
ldx #0
|
|
ldy #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Screen + 40*row + 1,x
|
|
sta c64.Screen + 40*row,x
|
|
.next
|
|
inx
|
|
dey
|
|
bpl -
|
|
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
sub scroll_right_full (alsocolors: SC) -> (A?, X?) {
|
|
; ---- scroll the whole screen 1 character to the right
|
|
; contents of the leftmost column are unchanged, you should clear/refill this yourself
|
|
; Carry flag determines if screen color data should be scrolled too
|
|
%asm {
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+
|
|
ldx #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Colors + 40*row + 0,x
|
|
sta c64.Colors + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen
|
|
ldx #38
|
|
-
|
|
.for row=0, row<=12, row+=1
|
|
lda c64.Screen + 40*row + 0,x
|
|
sta c64.Screen + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #38
|
|
-
|
|
.for row=13, row<=24, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*row + 1,x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
sub scroll_up_full (alsocolors: SC) -> (A?, X?) {
|
|
; ---- scroll the whole screen 1 character up
|
|
; contents of the bottom row are unchanged, you should refill/clear this yourself
|
|
; Carry flag determines if screen color data should be scrolled too
|
|
%asm {
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+
|
|
ldx #39
|
|
-
|
|
.for row=1, row<=11, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=12, row<=24, row+=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen
|
|
ldx #39
|
|
-
|
|
.for row=1, row<=11, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=12, row<=24, row+=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row-1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
sub scroll_down_full (alsocolors: SC) -> (A?, X?) {
|
|
; ---- scroll the whole screen 1 character down
|
|
; contents of the top row are unchanged, you should refill/clear this yourself
|
|
; Carry flag determines if screen color data should be scrolled too
|
|
%asm {
|
|
bcs +
|
|
jmp _scroll_screen
|
|
|
|
+
|
|
ldx #39
|
|
-
|
|
.for row=23, row>=12, row-=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=11, row>=0, row-=1
|
|
lda c64.Colors + 40*row,x
|
|
sta c64.Colors + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
_scroll_screen
|
|
ldx #39
|
|
-
|
|
.for row=23, row>=12, row-=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
ldx #39
|
|
-
|
|
.for row=11, row>=0, row-=1
|
|
lda c64.Screen + 40*row,x
|
|
sta c64.Screen + 40*(row+1),x
|
|
.next
|
|
dex
|
|
bpl -
|
|
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
sub byte2decimal (ubyte: A) -> (Y, X, A) {
|
|
; ---- A to decimal string in Y/X/A (100s in Y, 10s in X, 1s in A)
|
|
%asm {
|
|
ldy #$2f
|
|
ldx #$3a
|
|
sec
|
|
- iny
|
|
sbc #100
|
|
bcs -
|
|
- dex
|
|
adc #10
|
|
bmi -
|
|
adc #$2f
|
|
rts
|
|
}
|
|
}
|
|
|
|
sub byte2hex (ubyte: A) -> (X, Y, A?) {
|
|
; ---- A to hex string in XY (first hex char in X, second hex char in Y)
|
|
%asm {
|
|
pha
|
|
and #$0f
|
|
tax
|
|
ldy hex_digits,x
|
|
pla
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
tax
|
|
lda hex_digits,x
|
|
tax
|
|
rts
|
|
|
|
hex_digits .text "0123456789abcdef" ; can probably be reused for other stuff as well
|
|
}
|
|
}
|
|
|
|
|
|
var .text word2hex_output = "1234" ; 0-terminated, to make printing easier
|
|
sub word2hex (word: XY) -> (?) {
|
|
; ---- convert 16 bit word in X/Y into 4-character hexadecimal string into memory 'word2hex_output'
|
|
%asm {
|
|
stx c64.SCRATCH_ZP2
|
|
tya
|
|
jsr byte2hex
|
|
stx word2hex_output
|
|
sty word2hex_output+1
|
|
lda c64.SCRATCH_ZP2
|
|
jsr byte2hex
|
|
stx word2hex_output+2
|
|
sty word2hex_output+3
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
var .array(3) word2bcd_bcdbuff
|
|
sub word2bcd (word: XY) -> (A?, X?) {
|
|
; Convert an 16 bit binary value to BCD
|
|
;
|
|
; This function converts a 16 bit binary value in X/Y into a 24 bit BCD. It
|
|
; works by transferring one bit a time from the source and adding it
|
|
; into a BCD value that is being doubled on each iteration. As all the
|
|
; arithmetic is being done in BCD the result is a binary to decimal
|
|
; conversion.
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
sed ; switch to decimal mode
|
|
lda #0 ; ensure the result is clear
|
|
sta word2bcd_bcdbuff+0
|
|
sta word2bcd_bcdbuff+1
|
|
sta word2bcd_bcdbuff+2
|
|
ldx #16 ; the number of source bits
|
|
|
|
- asl c64.SCRATCH_ZP1 ; shift out one bit
|
|
rol c64.SCRATCH_ZP2
|
|
lda word2bcd_bcdbuff+0 ; and add into result
|
|
adc word2bcd_bcdbuff+0
|
|
sta word2bcd_bcdbuff+0
|
|
lda word2bcd_bcdbuff+1 ; propagating any carry
|
|
adc word2bcd_bcdbuff+1
|
|
sta word2bcd_bcdbuff+1
|
|
lda word2bcd_bcdbuff+2 ; ... thru whole result
|
|
adc word2bcd_bcdbuff+2
|
|
sta word2bcd_bcdbuff+2
|
|
dex ; and repeat for next bit
|
|
bne -
|
|
cld ; back to binary
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
var .array(5) word2decimal_output
|
|
sub word2decimal (word: XY) -> (?) {
|
|
; ---- convert 16 bit word in X/Y into decimal string into memory 'word2decimal_output'
|
|
%asm {
|
|
jsr word2bcd
|
|
lda word2bcd_bcdbuff+2
|
|
clc
|
|
adc #'0'
|
|
sta word2decimal_output
|
|
ldy #1
|
|
lda word2bcd_bcdbuff+1
|
|
jsr +
|
|
lda word2bcd_bcdbuff+0
|
|
|
|
+ pha
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
lsr a
|
|
clc
|
|
adc #'0'
|
|
sta word2decimal_output,y
|
|
iny
|
|
pla
|
|
and #$0f
|
|
adc #'0'
|
|
sta word2decimal_output,y
|
|
iny
|
|
rts
|
|
}
|
|
}
|
|
|
|
|
|
; @todo string to 32 bit unsigned integer http://www.6502.org/source/strings/ascii-to-32bit.html
|
|
|
|
|
|
sub print_string (address: XY) -> (A?, Y?) {
|
|
; ---- print null terminated string from X/Y
|
|
; note: the IL65 compiler contains an optimization that will replace
|
|
; a call to this subroutine with a string argument of just one char,
|
|
; by just one call to c64.CHROUT of that single char.
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
ldy #0
|
|
- lda (c64.SCRATCH_ZP1),y
|
|
beq +
|
|
jsr c64.CHROUT
|
|
iny
|
|
bne -
|
|
+ rts
|
|
}
|
|
}
|
|
|
|
|
|
sub print_pstring (address: XY) -> (A?, X?, Y) {
|
|
; ---- print pstring (length as first byte) from X/Y, returns str len in Y
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
sty c64.SCRATCH_ZP2
|
|
ldy #0
|
|
lda (c64.SCRATCH_ZP1),y
|
|
beq +
|
|
tax
|
|
- iny
|
|
lda (c64.SCRATCH_ZP1),y
|
|
jsr c64.CHROUT
|
|
dex
|
|
bne -
|
|
+ rts ; output string length is in Y
|
|
}
|
|
}
|
|
|
|
|
|
sub print_pimmediate () -> () {
|
|
; ---- print pstring in memory immediately following the subroutine fast call instruction
|
|
; note that the clobbered registers (A,X,Y) are not listed ON PURPOSE
|
|
%asm {
|
|
tsx
|
|
lda $102,x
|
|
tay ; put high byte in y
|
|
lda $101,x
|
|
tax ; and low byte in x.
|
|
inx
|
|
bne +
|
|
iny
|
|
+ jsr print_pstring ; print string in XY, returns string length in y.
|
|
tya
|
|
tsx
|
|
clc
|
|
adc $101,x ; add content of 1st (length) byte to return addr.
|
|
bcc + ; if that made the low byte roll over to 00,
|
|
inc $102,x ; then increment the high byte too.
|
|
+ clc
|
|
adc #1 ; now add 1 for the length byte itself.
|
|
sta $101,x
|
|
bne + ; if that made it (the low byte) roll over to 00,
|
|
inc $102,x ; increment the high byte of the return addr too.
|
|
+ rts
|
|
}
|
|
}
|
|
|
|
|
|
sub print_byte_decimal0 (ubyte: A) -> (?) {
|
|
; ---- print the byte in A in decimal form, with left padding 0s (3 positions total)
|
|
%asm {
|
|
jsr byte2decimal
|
|
pha
|
|
tya
|
|
jsr c64.CHROUT
|
|
txa
|
|
jsr c64.CHROUT
|
|
pla
|
|
jmp c64.CHROUT
|
|
}
|
|
}
|
|
|
|
|
|
sub print_byte_decimal (ubyte: A) -> (?) {
|
|
; ---- print the byte in A in decimal form, without left padding 0s
|
|
%asm {
|
|
jsr byte2decimal
|
|
pha
|
|
cpy #'0'
|
|
bne _print_hundreds
|
|
cpx #'0'
|
|
bne _print_tens
|
|
pla
|
|
jmp c64.CHROUT
|
|
_print_hundreds tya
|
|
jsr c64.CHROUT
|
|
_print_tens txa
|
|
jsr c64.CHROUT
|
|
pla
|
|
jmp c64.CHROUT
|
|
}
|
|
}
|
|
|
|
|
|
sub print_byte_hex (prefix: SC, ubyte: A) -> (?) {
|
|
; ---- print the byte in A in hex form (if Carry is set, a radix prefix '$' is printed as well)
|
|
%asm {
|
|
bcc +
|
|
pha
|
|
lda #'$'
|
|
jsr c64.CHROUT
|
|
pla
|
|
+ jsr byte2hex
|
|
txa
|
|
jsr c64.CHROUT
|
|
tya
|
|
jmp c64.CHROUT
|
|
}
|
|
}
|
|
|
|
|
|
sub print_word_hex (prefix: SC, word: XY) -> (?) {
|
|
; ---- print the (unsigned) word in X/Y in hexadecimal form (4 digits)
|
|
; (if Carry is set, a radix prefix '$' is printed as well)
|
|
%asm {
|
|
stx c64.SCRATCH_ZP1
|
|
tya
|
|
jsr print_byte_hex
|
|
lda c64.SCRATCH_ZP1
|
|
clc
|
|
jmp print_byte_hex
|
|
}
|
|
}
|
|
|
|
|
|
sub print_word_decimal0 (word: XY) -> (?) {
|
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; ---- print the (unsigned) word in X/Y in decimal form, with left padding 0s (5 positions total)
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%asm {
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jsr word2decimal
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lda word2decimal_output
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jsr c64.CHROUT
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lda word2decimal_output+1
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jsr c64.CHROUT
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lda word2decimal_output+2
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jsr c64.CHROUT
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lda word2decimal_output+3
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jsr c64.CHROUT
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lda word2decimal_output+4
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jmp c64.CHROUT
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}
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}
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sub print_word_decimal (word: XY) -> (A?, X?, Y?) {
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; ---- print the word in X/Y in decimal form, without left padding 0s
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%asm {
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jsr word2decimal
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ldy #0
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lda word2decimal_output
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cmp #'0'
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bne _pr_decimal
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iny
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lda word2decimal_output+1
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cmp #'0'
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bne _pr_decimal
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iny
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lda word2decimal_output+2
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cmp #'0'
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bne _pr_decimal
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iny
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lda word2decimal_output+3
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cmp #'0'
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bne _pr_decimal
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iny
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_pr_decimal
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lda word2decimal_output,y
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jsr c64.CHROUT
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iny
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cpy #5
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bcc _pr_decimal
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rts
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}
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}
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sub input_chars (buffer: AX) -> (A?, Y) {
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; ---- Input a string (max. 80 chars) from the keyboard.
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; It assumes the keyboard is selected as I/O channel!!
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%asm {
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sta c64.SCRATCH_ZP1
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stx c64.SCRATCH_ZP2
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ldy #0 ; char counter = 0
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- jsr c64.CHRIN
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cmp #$0d ; return (ascii 13) pressed?
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beq + ; yes, end.
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sta (c64.SCRATCH_ZP1),y ; else store char in buffer
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iny
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bne -
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+ lda #0
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sta (c64.SCRATCH_ZP1),y ; finish string with 0 byte
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rts
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}
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}
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} ; ---- end block c64scr
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;sub memcopy_basic () -> (?) {
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; ; ---- copy a memory block by using a BASIC ROM routine @todo fix code
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; ; it calls a function from the basic interpreter, so:
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; ; - BASIC ROM must be banked in
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; ; - the source block must be readable (so no RAM hidden under BASIC, Kernal, or I/O)
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; ; - the target block must be writable (so no RAM hidden under I/O)
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; ; higher addresses are copied first, so:
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; ; - moving data to higher addresses works even if areas overlap
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; ; - moving data to lower addresses only works if areas do not overlap
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; ; @todo fix this
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; %asm {
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; lda #<src_start
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; ldx #>src_start
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; sta $5f
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; stx $60
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; lda #<src_end
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; ldx #>src_end
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; sta $5a
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; stx $5b
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; lda #<(target_start + src_end - src_start)
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; ldx #>(target_start + src_end - src_start)
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; sta $58
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; stx $59
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; jmp $a3bf
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; }
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;}
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; macro version of the above memcopy_basic routine: @todo macro support?
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; MACRO PARAMS src_start, src_end, target_start
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; lda #<src_start
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; ldx #>src_start
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; sta $5f
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; stx $60
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; lda #<src_end
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; ldx #>src_end
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; sta $5a
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; stx $5b
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; lda #<(target_start + src_end - src_start)
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; ldx #>(target_start + src_end - src_start)
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; sta $58
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; stx $59
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; jsr $a3bf
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