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Irmen de Jong 2017-12-26 02:15:25 +01:00
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lib/c64lib.ill
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@ -3,90 +3,93 @@
;
; Written by Irmen de Jong (irmen@razorvine.net)
; License: GNU GPL 3.0, see LICENSE
;
; indent format: TABS, size=8
output raw
~ c64 {
memory SCRATCH_ZP1 = $02 ; scratch register #1 in ZP
memory SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
memory SCRATCH_ZP1 = $02 ; scratch register #1 in ZP
memory SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
memory .byte COLOR = $0286 ; cursor color
memory .word CINV = $0314 ; IRQ vector
memory .byte COLOR = $0286 ; cursor color
memory .word CINV = $0314 ; IRQ vector
; ---- VIC-II registers ----
memory SP0X = $d000
memory SP0Y = $d001
memory SP1X = $d002
memory SP1Y = $d003
memory SP2X = $d004
memory SP2Y = $d005
memory SP3X = $d006
memory SP3Y = $d007
memory SP4X = $d008
memory SP4Y = $d009
memory SP5X = $d00a
memory SP5Y = $d00b
memory SP6X = $d00c
memory SP6Y = $d00d
memory SP7X = $d00e
memory SP7Y = $d00f
memory SP0X = $d000
memory SP0Y = $d001
memory SP1X = $d002
memory SP1Y = $d003
memory SP2X = $d004
memory SP2Y = $d005
memory SP3X = $d006
memory SP3Y = $d007
memory SP4X = $d008
memory SP4Y = $d009
memory SP5X = $d00a
memory SP5Y = $d00b
memory SP6X = $d00c
memory SP6Y = $d00d
memory SP7X = $d00e
memory SP7Y = $d00f
memory MSIGX = $d010
memory SCROLY = $d011
memory RASTER = $d012
memory LPENX = $d013
memory LPENY = $d014
memory SPENA = $d015
memory SCROLX = $d016
memory YXPAND = $d017
memory VMCSB = $d018
memory VICIRQ = $d019
memory IREQMASK = $d01a
memory SPBGPR = $d01b
memory SPMC = $d01c
memory XXPAND = $d01d
memory SPSPCL = $d01e
memory SPBGCL = $d01f
memory MSIGX = $d010
memory SCROLY = $d011
memory RASTER = $d012
memory LPENX = $d013
memory LPENY = $d014
memory SPENA = $d015
memory SCROLX = $d016
memory YXPAND = $d017
memory VMCSB = $d018
memory VICIRQ = $d019
memory IREQMASK = $d01a
memory SPBGPR = $d01b
memory SPMC = $d01c
memory XXPAND = $d01d
memory SPSPCL = $d01e
memory SPBGCL = $d01f
memory EXTCOL = $d020 ; border color
memory BGCOL0 = $d021 ; screen color
memory BGCOL1 = $d022
memory BGCOL2 = $d023
memory BGCOL4 = $d024
memory SPMC0 = $d025
memory SPMC1 = $d026
memory SP0COL = $d027
memory SP1COL = $d028
memory SP2COL = $d029
memory SP3COL = $d02a
memory SP4COL = $d02b
memory SP5COL = $d02c
memory SP6COL = $d02d
memory SP7COL = $d02e
memory EXTCOL = $d020 ; border color
memory BGCOL0 = $d021 ; screen color
memory BGCOL1 = $d022
memory BGCOL2 = $d023
memory BGCOL4 = $d024
memory SPMC0 = $d025
memory SPMC1 = $d026
memory SP0COL = $d027
memory SP1COL = $d028
memory SP2COL = $d029
memory SP3COL = $d02a
memory SP4COL = $d02b
memory SP5COL = $d02c
memory SP6COL = $d02d
memory SP7COL = $d02e
; ---- end of VIC-II registers ----
; ---- C64 basic and kernal ROM float constants and functions ----
; note: the fac1 and fac2 are working registers and take 6 bytes each,
; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
; constants in five-byte "mflpt" format in the BASIC ROM
memory .float FL_PIVAL = $aea8 ; 3.1415926...
memory .float FL_N32768 = $b1a5 ; -32768
memory .float FL_FONE = $b9bc ; 1
memory .float FL_SQRHLF = $b9d6 ; SQR(2) / 2
memory .float FL_SQRTWO = $b9db ; SQR(2)
memory .float FL_NEGHLF = $b9e0 ; -.5
memory .float FL_LOG2 = $b9e5 ; LOG(2)
memory .float FL_TENC = $baf9 ; 10
memory .float FL_NZMIL = $bdbd ; 1e9 (1 billion)
memory .float FL_FHALF = $bf11 ; .5
memory .float FL_LOGEB2 = $bfbf ; 1 / LOG(2)
memory .float FL_PIHALF = $e2e0 ; PI / 2
memory .float FL_TWOPI = $e2e5 ; 2 * PI
memory .float FL_FR4 = $e2ea ; .25
memory .float FL_PIVAL = $aea8 ; 3.1415926...
memory .float FL_N32768 = $b1a5 ; -32768
memory .float FL_FONE = $b9bc ; 1
memory .float FL_SQRHLF = $b9d6 ; SQR(2) / 2
memory .float FL_SQRTWO = $b9db ; SQR(2)
memory .float FL_NEGHLF = $b9e0 ; -.5
memory .float FL_LOG2 = $b9e5 ; LOG(2)
memory .float FL_TENC = $baf9 ; 10
memory .float FL_NZMIL = $bdbd ; 1e9 (1 billion)
memory .float FL_FHALF = $bf11 ; .5
memory .float FL_LOGEB2 = $bfbf ; 1 / LOG(2)
memory .float FL_PIHALF = $e2e0 ; PI / 2
memory .float FL_TWOPI = $e2e5 ; 2 * PI
memory .float FL_FR4 = $e2ea ; .25
; @todo verify clobbered registers?
@ -94,14 +97,14 @@ output raw
; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
; checked functions below:
sub MOVFM (mflpt: AY) -> (A?, Y?) = $bba2 ; load mflpt value from memory in A/Y into fac1
sub FREADMEM () -> (A?, Y?) = $bba6 ; load mflpt value from memory in $22/$23 into fac1
sub CONUPK (mflpt: AY) -> (A?, Y?) = $ba8c ; load mflpt value from memory in A/Y into fac2
sub FAREADMEM () -> (A?, Y?) = $ba90 ; load mflpt value from memory in $22/$23 into fac2
sub MOVFM (mflpt: AY) -> (A?, Y?) = $bba2 ; load mflpt value from memory in A/Y into fac1
sub FREADMEM () -> (A?, Y?) = $bba6 ; load mflpt value from memory in $22/$23 into fac1
sub CONUPK (mflpt: AY) -> (A?, Y?) = $ba8c ; load mflpt value from memory in A/Y into fac2
sub FAREADMEM () -> (A?, Y?) = $ba90 ; load mflpt value from memory in $22/$23 into fac2
sub MOVFA () -> (A?, X?) = $bbfc ; copy fac2 to fac1
sub MOVAF () -> (A?, X?) = $bc0c ; copy fac1 to fac2 (rounded)
sub MOVEF () -> (A?, X?) = $bc0f ; copy fac1 to fac2
sub FTOMEMXY (mflpt: XY) -> (A?, Y?) = $bbd4 ; store fac1 to memory X/Y as 5-byte mflpt
sub FTOMEMXY (mflpt: XY) -> (A?, Y?) = $bbd4 ; store fac1 to memory X/Y as 5-byte mflpt
sub FTOSWORDYA () -> (Y, A, X?) = $b1aa ; fac1-> signed word in Y/A (might throw ILLEGAL QUANTITY)
; use c64util.FTOSWRDAY to get A/Y output (lo/hi switched to normal order)
sub GETADR () -> (Y, A, X?) = $b7f7 ; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY)
@ -174,8 +177,8 @@ sub VECTOR (dir: SC, userptr: XY) -> (A?, Y?) = $FF8D ; read/set I/O vect
sub SETMSG (value: A) -> () = $FF90 ; set Kernal message control flag
sub SECOND (address: A) -> (A?) = $FF93 ; (alias: LSTNSA) send secondary address after LISTEN
sub TKSA (address: A) -> (A?) = $FF96 ; (alias: TALKSA) send secondary address after TALK
sub MEMTOP (dir: SC, address: XY) -> (XY) = $FF99 ; read/set top of memory pointer
sub MEMBOT (dir: SC, address: XY) -> (XY) = $FF9C ; read/set bottom of memory pointer
sub MEMTOP (dir: SC, address: XY) -> (XY) = $FF99 ; read/set top of memory pointer
sub MEMBOT (dir: SC, address: XY) -> (XY) = $FF9C ; read/set bottom of memory pointer
sub SCNKEY () -> (A?, X?, Y?) = $FF9F ; scan the keyboard
sub SETTMO (timeout: A) -> () = $FFA2 ; set time-out flag for IEEE bus
sub ACPTR () -> (A) = $FFA5 ; (alias: IECIN) input byte from serial bus
@ -208,9 +211,9 @@ sub IOBASE () -> (X, Y) = $FFF3 ; read base address
; ---- end of C64 kernal routines ----
memory .word NMI_VEC = $FFFA ; nmi vector, set by the kernal if banked in
memory .word RESET_VEC = $FFFC ; reset vector, set by the kernal if banked in
memory .word IRQ_VEC = $FFFE ; interrupt vector, set by the kernal if banked in
memory .word NMI_VEC = $FFFA ; nmi vector, set by the kernal if banked in
memory .word RESET_VEC = $FFFC ; reset vector, set by the kernal if banked in
memory .word IRQ_VEC = $FFFE ; interrupt vector, set by the kernal if banked in
}
@ -225,7 +228,7 @@ sub FREADS32 () -> (A?, X?, Y?) {
asl a
lda #0
ldx #$a0
jmp $bc4f
jmp $bc4f ; internal BASIC routine
}
}
@ -235,7 +238,7 @@ sub FREADUS32 () -> (A?, X?, Y?) {
sec
lda #0
ldx #$a0
jmp $bc4f
jmp $bc4f ; internal BASIC routine
}
}
@ -252,7 +255,7 @@ sub FREADS24AXY (lo: A, mid: X, hi: Y) -> (A?, X?, Y?) {
lda #0
sta $65
ldx #$98
jmp $bc4f
jmp $bc4f ; internal BASIC routine
}
}
@ -263,7 +266,7 @@ sub GIVUAYF (uword: AY) -> (A?, X?, Y?) {
sta $63
ldx #$90
sec
jmp $bc49
jmp $bc49 ; internal BASIC routine
}
}
@ -273,14 +276,14 @@ sub GIVAYFAY (sword: AY) -> (A?, X?, Y?) {
sta c64.SCRATCH_ZP1
tya
ldy c64.SCRATCH_ZP1
jmp c64.GIVAYF ; this uses the inverse order, Y/A
jmp c64.GIVAYF ; this uses the inverse order, Y/A
}
}
sub FTOSWRDAY () -> (A, Y, X?) {
; ---- fac1 to signed word in A/Y
asm {
jsr c64.FTOSWORDYA ; note the inverse Y/A order
jsr c64.FTOSWORDYA ; note the inverse Y/A order
sta c64.SCRATCH_ZP1
tya
ldy c64.SCRATCH_ZP1
@ -291,7 +294,7 @@ sub FTOSWRDAY () -> (A, Y, X?) {
sub GETADRAY () -> (A, Y, X?) {
; ---- fac1 to unsigned word in A/Y
asm {
jsr c64.GETADR ; this uses the inverse order, Y/A
jsr c64.GETADR ; this uses the inverse order, Y/A
sta c64.SCRATCH_ZP1
tya
ldy c64.SCRATCH_ZP1
@ -328,34 +331,34 @@ sub print_pstring (address: XY) -> (A?, X?, Y) {
jsr c64.CHROUT
dex
bne -
+ rts ; output string length is in Y
+ rts ; output string length is in Y
}
}
sub print_pimmediate () -> () {
; ---- print pstring in memory immediately following the subroutine fast call instruction
; ---- 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
tay ; put high byte in y
lda $101,x
tax ; and low byte in x.
tax ; and low byte in x.
inx
bne +
iny
+ jsr print_pstring ; print string in XY, returns string length in y.
+ 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.
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.
inc $102,x ; then increment the high byte too.
+ clc
adc #1 ; now add 1 for the length byte itself.
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.
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
}
}
@ -394,13 +397,13 @@ sub byte2hex (ubyte: A) -> (X, Y, A?) {
tax
rts
hex_digits .text "0123456789abcdef" ; can probably be reused for other stuff as well
hex_digits .text "0123456789abcdef" ; can probably be reused for other stuff as well
}
}
var .array(3) word2bcd_bcdbuff
var .array(3) word2bcd_bcdbuff
sub word2bcd (address: XY) -> (A?, X?) {
; Convert an 16 bit binary value to BCD
;
@ -412,35 +415,35 @@ sub word2bcd (address: XY) -> (A?, X?) {
asm {
stx c64.SCRATCH_ZP1
sty c64.SCRATCH_ZP2
sed ; switch to decimal mode
lda #0 ; ensure the result is clear
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
ldx #16 ; the number of source bits
- asl c64.SCRATCH_ZP1 ; shift out one bit
- asl c64.SCRATCH_ZP1 ; shift out one bit
rol c64.SCRATCH_ZP2
lda word2bcd_bcdbuff+0 ; and add into result
lda word2bcd_bcdbuff+0 ; and add into result
adc word2bcd_bcdbuff+0
sta word2bcd_bcdbuff+0
lda word2bcd_bcdbuff+1 ; propagating any carry
lda word2bcd_bcdbuff+1 ; propagating any carry
adc word2bcd_bcdbuff+1
sta word2bcd_bcdbuff+1
lda word2bcd_bcdbuff+2 ; ... thru whole result
lda word2bcd_bcdbuff+2 ; ... thru whole result
adc word2bcd_bcdbuff+2
sta word2bcd_bcdbuff+2
dex ; and repeat for next bit
dex ; and repeat for next bit
bne -
cld ; back to binary
cld ; back to binary
rts
}
}
var .array(5) word2decimal_output
var .array(5) word2decimal_output
sub word2decimal (address: XY) -> (A?, X?, Y?) {
; ---- convert 16 bit word in X/Y into decimal string into memory 'word2decimal_output'
; ---- convert 16 bit word in X/Y into decimal string into memory 'word2decimal_output'
asm {
jsr word2bcd
lda word2bcd_bcdbuff+2
@ -572,15 +575,15 @@ sub input_chars (buffer: AX) -> (A?, Y) {
asm {
sta c64.SCRATCH_ZP1
stx c64.SCRATCH_ZP2
ldy #0 ; char counter = 0
ldy #0 ; char counter = 0
- jsr c64.CHRIN
cmp #$0d ; return (ascii 13) pressed?
beq + ; yes, end.
sta (c64.SCRATCH_ZP1),y ; else store char in buffer
cmp #$0d ; return (ascii 13) pressed?
beq + ; yes, end.
sta (c64.SCRATCH_ZP1),y ; else store char in buffer
iny
bne -
+ lda #0
sta (c64.SCRATCH_ZP1),y ; finish string with 0 byte
sta (c64.SCRATCH_ZP1),y ; finish string with 0 byte
rts
}