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480 lines
20 KiB
Lua
480 lines
20 KiB
Lua
; Prog8 definitions for the CommanderX16
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; Including memory registers, I/O registers, Basic and Kernal 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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%target cx16
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c64 {
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; ---- kernal routines, these are the same as on the Commodore-64 (hence the same block name) ----
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; STROUT --> use txt.print
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; CLEARSCR -> use txt.clear_screen
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; HOMECRSR -> use txt.plot
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romsub $FF81 = CINT() clobbers(A,X,Y) ; (alias: SCINIT) initialize screen editor and video chip
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romsub $FF84 = IOINIT() clobbers(A, X) ; initialize I/O devices (CIA, SID, IRQ)
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romsub $FF87 = RAMTAS() clobbers(A,X,Y) ; initialize RAM, tape buffer, screen
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romsub $FF8A = RESTOR() clobbers(A,X,Y) ; restore default I/O vectors
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romsub $FF8D = VECTOR(uword userptr @ XY, ubyte dir @ Pc) clobbers(A,Y) ; read/set I/O vector table
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romsub $FF90 = SETMSG(ubyte value @ A) ; set Kernal message control flag
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romsub $FF93 = SECOND(ubyte address @ A) clobbers(A) ; (alias: LSTNSA) send secondary address after LISTEN
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romsub $FF96 = TKSA(ubyte address @ A) clobbers(A) ; (alias: TALKSA) send secondary address after TALK
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romsub $FF99 = MEMTOP(uword address @ XY, ubyte dir @ Pc) -> uword @ XY ; read/set top of memory pointer
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romsub $FF9C = MEMBOT(uword address @ XY, ubyte dir @ Pc) -> uword @ XY ; read/set bottom of memory pointer
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romsub $FF9F = SCNKEY() clobbers(A,X,Y) ; scan the keyboard
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romsub $FFA2 = SETTMO(ubyte timeout @ A) ; set time-out flag for IEEE bus
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romsub $FFA5 = ACPTR() -> ubyte @ A ; (alias: IECIN) input byte from serial bus
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romsub $FFA8 = CIOUT(ubyte databyte @ A) ; (alias: IECOUT) output byte to serial bus
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romsub $FFAB = UNTLK() clobbers(A) ; command serial bus device to UNTALK
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romsub $FFAE = UNLSN() clobbers(A) ; command serial bus device to UNLISTEN
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romsub $FFB1 = LISTEN(ubyte device @ A) clobbers(A) ; command serial bus device to LISTEN
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romsub $FFB4 = TALK(ubyte device @ A) clobbers(A) ; command serial bus device to TALK
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romsub $FFB7 = READST() -> ubyte @ A ; read I/O status word
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romsub $FFBA = SETLFS(ubyte logical @ A, ubyte device @ X, ubyte address @ Y) ; set logical file parameters
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romsub $FFBD = SETNAM(ubyte namelen @ A, str filename @ XY) ; set filename parameters
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romsub $FFC0 = OPEN() clobbers(X,Y) -> ubyte @Pc, ubyte @A ; (via 794 ($31A)) open a logical file
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romsub $FFC3 = CLOSE(ubyte logical @ A) clobbers(A,X,Y) ; (via 796 ($31C)) close a logical file
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romsub $FFC6 = CHKIN(ubyte logical @ X) clobbers(A,X) -> ubyte @Pc ; (via 798 ($31E)) define an input channel
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romsub $FFC9 = CHKOUT(ubyte logical @ X) clobbers(A,X) ; (via 800 ($320)) define an output channel
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romsub $FFCC = CLRCHN() clobbers(A,X) ; (via 802 ($322)) restore default devices
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romsub $FFCF = CHRIN() clobbers(X, Y) -> ubyte @ A ; (via 804 ($324)) input a character (for keyboard, read a whole line from the screen) A=byte read.
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romsub $FFD2 = CHROUT(ubyte char @ A) ; (via 806 ($326)) output a character
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romsub $FFD5 = LOAD(ubyte verify @ A, uword address @ XY) -> ubyte @Pc, ubyte @ A, ubyte @ X, ubyte @ Y ; (via 816 ($330)) load from device
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romsub $FFD8 = SAVE(ubyte zp_startaddr @ A, uword endaddr @ XY) -> ubyte @ Pc, ubyte @ A ; (via 818 ($332)) save to a device
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romsub $FFDB = SETTIM(ubyte low @ A, ubyte middle @ X, ubyte high @ Y) ; set the software clock
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romsub $FFDE = RDTIM() -> ubyte @ A, ubyte @ X, ubyte @ Y ; read the software clock
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romsub $FFE1 = STOP() clobbers(X) -> ubyte @ Pz, ubyte @ A ; (via 808 ($328)) check the STOP key (and some others in A)
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romsub $FFE4 = GETIN() clobbers(X,Y) -> ubyte @Pc, ubyte @ A ; (via 810 ($32A)) get a character
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romsub $FFE7 = CLALL() clobbers(A,X) ; (via 812 ($32C)) close all files
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romsub $FFEA = UDTIM() clobbers(A,X) ; update the software clock
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romsub $FFED = SCREEN() -> ubyte @ X, ubyte @ Y ; read number of screen rows and columns
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romsub $FFF0 = PLOT(ubyte col @ Y, ubyte row @ X, ubyte dir @ Pc) -> ubyte @ X, ubyte @ Y ; read/set position of cursor on screen. Use txt.plot for a 'safe' wrapper that preserves X.
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romsub $FFF3 = IOBASE() -> uword @ XY ; read base address of I/O devices
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; ---- utility
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asmsub STOP2() -> ubyte @A {
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; -- check if STOP key was pressed, returns true if so. More convenient to use than STOP() because that only sets the carry status flag.
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%asm {{
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phx
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jsr c64.STOP
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beq +
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plx
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lda #0
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rts
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+ plx
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lda #1
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rts
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}}
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}
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}
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cx16 {
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; 65c02 hardware vectors:
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&uword NMI_VEC = $FFFA ; 6502 nmi vector, determined by the kernal if banked in
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&uword RESET_VEC = $FFFC ; 6502 reset vector, determined by the kernal if banked in
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&uword IRQ_VEC = $FFFE ; 6502 interrupt vector, determined by the kernal if banked in
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; the sixteen virtual 16-bit registers
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&uword r0 = $0002
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&uword r1 = $0004
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&uword r2 = $0006
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&uword r3 = $0008
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&uword r4 = $000a
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&uword r5 = $000c
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&uword r6 = $000e
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&uword r7 = $0010
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&uword r8 = $0012
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&uword r9 = $0014
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&uword r10 = $0016
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&uword r11 = $0018
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&uword r12 = $001a
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&uword r13 = $001c
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&uword r14 = $001e
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&uword r15 = $0020
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; VERA registers
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const uword VERA_BASE = $9F20
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&ubyte VERA_ADDR_L = VERA_BASE + $0000
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&ubyte VERA_ADDR_M = VERA_BASE + $0001
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&ubyte VERA_ADDR_H = VERA_BASE + $0002
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&ubyte VERA_DATA0 = VERA_BASE + $0003
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&ubyte VERA_DATA1 = VERA_BASE + $0004
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&ubyte VERA_CTRL = VERA_BASE + $0005
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&ubyte VERA_IEN = VERA_BASE + $0006
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&ubyte VERA_ISR = VERA_BASE + $0007
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&ubyte VERA_IRQ_LINE_L = VERA_BASE + $0008
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&ubyte VERA_DC_VIDEO = VERA_BASE + $0009
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&ubyte VERA_DC_HSCALE = VERA_BASE + $000A
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&ubyte VERA_DC_VSCALE = VERA_BASE + $000B
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&ubyte VERA_DC_BORDER = VERA_BASE + $000C
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&ubyte VERA_DC_HSTART = VERA_BASE + $0009
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&ubyte VERA_DC_HSTOP = VERA_BASE + $000A
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&ubyte VERA_DC_VSTART = VERA_BASE + $000B
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&ubyte VERA_DC_VSTOP = VERA_BASE + $000C
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&ubyte VERA_L0_CONFIG = VERA_BASE + $000D
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&ubyte VERA_L0_MAPBASE = VERA_BASE + $000E
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&ubyte VERA_L0_TILEBASE = VERA_BASE + $000F
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&ubyte VERA_L0_HSCROLL_L = VERA_BASE + $0010
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&ubyte VERA_L0_HSCROLL_H = VERA_BASE + $0011
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&ubyte VERA_L0_VSCROLL_L = VERA_BASE + $0012
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&ubyte VERA_L0_VSCROLL_H = VERA_BASE + $0013
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&ubyte VERA_L1_CONFIG = VERA_BASE + $0014
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&ubyte VERA_L1_MAPBASE = VERA_BASE + $0015
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&ubyte VERA_L1_TILEBASE = VERA_BASE + $0016
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&ubyte VERA_L1_HSCROLL_L = VERA_BASE + $0017
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&ubyte VERA_L1_HSCROLL_H = VERA_BASE + $0018
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&ubyte VERA_L1_VSCROLL_L = VERA_BASE + $0019
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&ubyte VERA_L1_VSCROLL_H = VERA_BASE + $001A
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&ubyte VERA_AUDIO_CTRL = VERA_BASE + $001B
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&ubyte VERA_AUDIO_RATE = VERA_BASE + $001C
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&ubyte VERA_AUDIO_DATA = VERA_BASE + $001D
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&ubyte VERA_SPI_DATA = VERA_BASE + $001E
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&ubyte VERA_SPI_CTRL = VERA_BASE + $001F
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; VERA_PSG_BASE = $1F9C0
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; VERA_PALETTE_BASE = $1FA00
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; VERA_SPRITES_BASE = $1FC00
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; I/O
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const uword via1 = $9f60 ;VIA 6522 #1
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&ubyte d1prb = via1+0
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&ubyte d1pra = via1+1
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&ubyte d1ddrb = via1+2
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&ubyte d1ddra = via1+3
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&ubyte d1t1l = via1+4
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&ubyte d1t1h = via1+5
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&ubyte d1t1ll = via1+6
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&ubyte d1t1lh = via1+7
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&ubyte d1t2l = via1+8
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&ubyte d1t2h = via1+9
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&ubyte d1sr = via1+10
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&ubyte d1acr = via1+11
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&ubyte d1pcr = via1+12
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&ubyte d1ifr = via1+13
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&ubyte d1ier = via1+14
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&ubyte d1ora = via1+15
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const uword via2 = $9f70 ;VIA 6522 #2
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&ubyte d2prb = via2+0
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&ubyte d2pra = via2+1
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&ubyte d2ddrb = via2+2
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&ubyte d2ddra = via2+3
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&ubyte d2t1l = via2+4
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&ubyte d2t1h = via2+5
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&ubyte d2t1ll = via2+6
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&ubyte d2t1lh = via2+7
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&ubyte d2t2l = via2+8
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&ubyte d2t2h = via2+9
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&ubyte d2sr = via2+10
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&ubyte d2acr = via2+11
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&ubyte d2pcr = via2+12
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&ubyte d2ifr = via2+13
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&ubyte d2ier = via2+14
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&ubyte d2ora = via2+15
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; ---- Commander X-16 additions on top of C64 kernal routines ----
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; spelling of the names is taken from the Commander X-16 rom sources
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; supported C128 additions
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romsub $ff4a = close_all(ubyte device @A) clobbers(A,X,Y)
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romsub $ff59 = lkupla(ubyte la @A) clobbers(A,X,Y)
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romsub $ff5c = lkupsa(ubyte sa @Y) clobbers(A,X,Y)
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romsub $ff5f = screen_set_mode(ubyte mode @A) clobbers(A, X, Y) -> ubyte @Pc
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romsub $ff62 = screen_set_charset(ubyte charset @A, uword charsetptr @XY) clobbers(A,X,Y) ; incompatible with C128 dlchr()
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; not yet supported: romsub $ff65 = pfkey() clobbers(A,X,Y)
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romsub $ff6e = jsrfar()
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romsub $ff74 = fetch(ubyte bank @X, ubyte index @Y) clobbers(X) -> ubyte @A
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romsub $ff77 = stash(ubyte data @A, ubyte bank @X, ubyte index @Y) clobbers(X)
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romsub $ff7a = cmpare(ubyte data @A, ubyte bank @X, ubyte index @Y) clobbers(X)
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romsub $ff7d = primm()
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; X16 additions
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romsub $ff44 = macptr() clobbers(A,X,Y)
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romsub $ff47 = enter_basic(ubyte cold_or_warm @Pc) clobbers(A,X,Y)
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romsub $ff68 = mouse_config(ubyte shape @A, ubyte scale @X) clobbers (A, X, Y)
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romsub $ff6b = mouse_get(ubyte zpdataptr @X) clobbers(A)
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romsub $ff71 = mouse_scan() clobbers(A, X, Y)
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romsub $ff53 = joystick_scan() clobbers(A, X, Y)
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romsub $ff56 = joystick_get(ubyte joynr @A) -> ubyte @A, ubyte @X, ubyte @Y
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romsub $ff4d = clock_set_date_time(uword yearmonth @R0, uword dayhours @R1, uword minsecs @R2, ubyte jiffies @R3) clobbers(A, X, Y)
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romsub $ff50 = clock_get_date_time() clobbers(A, X, Y) -> uword @R0, uword @R1, uword @R2, ubyte @R3 ; result registers see clock_set_date_time()
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; TODO specify the correct clobbers for alle these functions below, we now assume all 3 regs are clobbered
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; high level graphics & fonts
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romsub $ff20 = GRAPH_init(uword vectors @R0) clobbers(A,X,Y)
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romsub $ff23 = GRAPH_clear() clobbers(A,X,Y)
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romsub $ff26 = GRAPH_set_window(uword x @R0, uword y @R1, uword width @R2, uword height @R3) clobbers(A,X,Y)
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romsub $ff29 = GRAPH_set_colors(ubyte stroke @A, ubyte fill @X, ubyte background @Y) clobbers (A,X,Y)
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romsub $ff2c = GRAPH_draw_line(uword x1 @R0, uword y1 @R1, uword x2 @R2, uword y2 @R3) clobbers(A,X,Y)
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romsub $ff2f = GRAPH_draw_rect(uword x @R0, uword y @R1, uword width @R2, uword height @R3, uword cornerradius @R4, ubyte fill @Pc) clobbers(A,X,Y)
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romsub $ff32 = GRAPH_move_rect(uword sx @R0, uword sy @R1, uword tx @R2, uword ty @R3, uword width @R4, uword height @R5) clobbers(A,X,Y)
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romsub $ff35 = GRAPH_draw_oval(uword x @R0, uword y @R1, uword width @R2, uword height @R3, ubyte fill @Pc) clobbers(A,X,Y)
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romsub $ff38 = GRAPH_draw_image(uword x @R0, uword y @R1, uword ptr @R2, uword width @R3, uword height @R4) clobbers(A,X,Y)
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romsub $ff3b = GRAPH_set_font(uword fontptr @R0) clobbers(A,X,Y)
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romsub $ff3e = GRAPH_get_char_size(ubyte baseline @A, ubyte width @X, ubyte height_or_style @Y, ubyte is_control @Pc) clobbers(A,X,Y)
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romsub $ff41 = GRAPH_put_char(uword x @R0, uword y @R1, ubyte char @A) clobbers(A,X,Y)
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romsub $ff41 = GRAPH_put_next_char(ubyte char @A) clobbers(A,X,Y) ; alias for the routine above that doesn't reset the position of the initial character
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; framebuffer
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romsub $fef6 = FB_init() clobbers(A,X,Y)
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romsub $fef9 = FB_get_info() clobbers(X,Y) -> byte @A, uword @R0, uword @R1 ; width=r0, height=r1
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romsub $fefc = FB_set_palette(uword pointer @R0, ubyte index @A, ubyte bytecount @X) clobbers(A,X,Y)
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romsub $feff = FB_cursor_position(uword x @R0, uword y @R1) clobbers(A,X,Y)
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romsub $feff = FB_cursor_position2() clobbers(A,X,Y) ; alias for the previous routine, but avoiding having to respecify both x and y every time
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romsub $ff02 = FB_cursor_next_line(uword x @R0) clobbers(A,X,Y)
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romsub $ff05 = FB_get_pixel() clobbers(X,Y) -> ubyte @A
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romsub $ff08 = FB_get_pixels(uword pointer @R0, uword count @R1) clobbers(A,X,Y)
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romsub $ff0b = FB_set_pixel(ubyte color @A) clobbers(A,X,Y)
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romsub $ff0e = FB_set_pixels(uword pointer @R0, uword count @R1) clobbers(A,X,Y)
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romsub $ff11 = FB_set_8_pixels(ubyte pattern @A, ubyte color @X) clobbers(A,X,Y)
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romsub $ff14 = FB_set_8_pixels_opaque(ubyte pattern @R0, ubyte mask @A, ubyte color1 @X, ubyte color2 @Y) clobbers(A,X,Y)
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romsub $ff17 = FB_fill_pixels(uword count @R0, uword pstep @R1, ubyte color @A) clobbers(A,X,Y)
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romsub $ff1a = FB_filter_pixels(uword pointer @ R0, uword count @R1) clobbers(A,X,Y)
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romsub $ff1d = FB_move_pixels(uword sx @R0, uword sy @R1, uword tx @R2, uword ty @R3, uword count @R4) clobbers(A,X,Y)
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; misc
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romsub $fef0 = sprite_set_image(uword pixels @R0, uword mask @R1, ubyte bpp @R2, ubyte number @A, ubyte width @X, ubyte height @Y, ubyte apply_mask @Pc) clobbers(A,X,Y) -> ubyte @Pc
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romsub $fef3 = sprite_set_position(uword x @R0, uword y @R1, ubyte number @A) clobbers(A,X,Y)
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romsub $fee4 = memory_fill(uword address @R0, uword num_bytes @R1, ubyte value @A) clobbers(A,X,Y)
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romsub $fee7 = memory_copy(uword source @R0, uword target @R1, uword num_bytes @R2) clobbers(A,X,Y)
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romsub $feea = memory_crc(uword address @R0, uword num_bytes @R1) clobbers(A,X,Y) -> uword @R2
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romsub $feed = memory_decompress(uword input @R0, uword output @R1) clobbers(A,X,Y) -> uword @R1 ; last address +1 is result in R1
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romsub $fedb = console_init(uword x @R0, uword y @R1, uword width @R2, uword height @R3) clobbers(A,X,Y)
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romsub $fede = console_put_char(ubyte char @A, ubyte wrapping @Pc) clobbers(A,X,Y)
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romsub $fee1 = console_get_char() clobbers(X,Y) -> ubyte @A
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romsub $fed8 = console_put_image(uword pointer @R0, uword width @R1, uword height @R2) clobbers(A,X,Y)
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romsub $fed5 = console_set_paging_message(uword msgptr @R0) clobbers(A,X,Y)
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romsub $fed2 = kbdbuf_put(ubyte key @A) clobbers(A,X,Y)
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romsub $fecf = entropy_get() -> ubyte @A, ubyte @X, ubyte @Y
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romsub $fecc = monitor() clobbers(A,X,Y)
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; ---- end of kernal routines ----
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; ---- utilities -----
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asmsub vpeek(ubyte bank @A, uword address @XY) -> ubyte @A {
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; -- get a byte from VERA's video memory
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; note: inefficient when reading multiple sequential bytes!
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%asm {{
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pha
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lda #1
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sta cx16.VERA_CTRL
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pla
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and #1
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sta cx16.VERA_ADDR_H
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sty cx16.VERA_ADDR_M
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stx cx16.VERA_ADDR_L
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lda cx16.VERA_DATA1
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rts
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}}
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}
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asmsub vaddr(ubyte bank @A, uword address @R0, ubyte addrsel @R1, byte autoIncrOrDecrByOne @Y) {
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; -- setup the VERA's data address register 0 or 1
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%asm {{
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and #1
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pha
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lda cx16.r1
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and #1
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sta cx16.VERA_CTRL
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lda cx16.r0
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sta cx16.VERA_ADDR_L
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lda cx16.r0+1
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sta cx16.VERA_ADDR_M
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pla
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|
cpy #0
|
|
bmi ++
|
|
beq +
|
|
ora #%00010000
|
|
+ sta cx16.VERA_ADDR_H
|
|
rts
|
|
+ ora #%00011000
|
|
sta cx16.VERA_ADDR_H
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
asmsub vpoke(ubyte bank @A, uword address @R0, ubyte value @Y) {
|
|
; -- write a single byte to VERA's video memory
|
|
; note: inefficient when writing multiple sequential bytes!
|
|
%asm {{
|
|
stz cx16.VERA_CTRL
|
|
and #1
|
|
sta cx16.VERA_ADDR_H
|
|
lda cx16.r0
|
|
sta cx16.VERA_ADDR_L
|
|
lda cx16.r0+1
|
|
sta cx16.VERA_ADDR_M
|
|
sty cx16.VERA_DATA0
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub vpoke_or(ubyte bank @A, uword address @R0, ubyte value @Y) {
|
|
; -- or a single byte to the value already in the VERA's video memory at that location
|
|
; note: inefficient when writing multiple sequential bytes!
|
|
%asm {{
|
|
stz cx16.VERA_CTRL
|
|
and #1
|
|
sta cx16.VERA_ADDR_H
|
|
lda cx16.r0
|
|
sta cx16.VERA_ADDR_L
|
|
lda cx16.r0+1
|
|
sta cx16.VERA_ADDR_M
|
|
tya
|
|
ora cx16.VERA_DATA0
|
|
sta cx16.VERA_DATA0
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub vpoke_and(ubyte bank @A, uword address @R0, ubyte value @Y) {
|
|
; -- and a single byte to the value already in the VERA's video memory at that location
|
|
; note: inefficient when writing multiple sequential bytes!
|
|
%asm {{
|
|
stz cx16.VERA_CTRL
|
|
and #1
|
|
sta cx16.VERA_ADDR_H
|
|
lda cx16.r0
|
|
sta cx16.VERA_ADDR_L
|
|
lda cx16.r0+1
|
|
sta cx16.VERA_ADDR_M
|
|
tya
|
|
and cx16.VERA_DATA0
|
|
sta cx16.VERA_DATA0
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub vpoke_xor(ubyte bank @A, uword address @R0, ubyte value @Y) {
|
|
; -- xor a single byte to the value already in the VERA's video memory at that location
|
|
; note: inefficient when writing multiple sequential bytes!
|
|
%asm {{
|
|
stz cx16.VERA_CTRL
|
|
and #1
|
|
sta cx16.VERA_ADDR_H
|
|
lda cx16.r0
|
|
sta cx16.VERA_ADDR_L
|
|
lda cx16.r0+1
|
|
sta cx16.VERA_ADDR_M
|
|
tya
|
|
eor cx16.VERA_DATA0
|
|
sta cx16.VERA_DATA0
|
|
rts
|
|
}}
|
|
}
|
|
|
|
sub FB_set_pixels_from_buf(uword buffer, uword count) {
|
|
%asm {{
|
|
; -- This is replacement code for the normal FB_set_pixels subroutine in ROM
|
|
; However that routine contains a bug in the current v38 ROM that makes it crash when count > 255.
|
|
; So the code below replaces that. Once the ROM is patched this routine is no longer necessary.
|
|
; See https://github.com/commanderx16/x16-rom/issues/179
|
|
phx
|
|
lda buffer
|
|
ldy buffer+1
|
|
sta P8ZP_SCRATCH_W1
|
|
sty P8ZP_SCRATCH_W1+1
|
|
jsr _pixels
|
|
plx
|
|
rts
|
|
|
|
_pixels lda count+1
|
|
beq +
|
|
ldx #0
|
|
- jsr _loop
|
|
inc P8ZP_SCRATCH_W1+1
|
|
dec count+1
|
|
bne -
|
|
|
|
+ ldx count
|
|
_loop ldy #0
|
|
- lda (P8ZP_SCRATCH_W1),y
|
|
sta cx16.VERA_DATA0
|
|
iny
|
|
dex
|
|
bne -
|
|
rts
|
|
}}
|
|
}
|
|
|
|
|
|
|
|
sub wait(uword jiffies) {
|
|
uword current_time = 0
|
|
c64.SETTIM(0,0,0)
|
|
|
|
while current_time < jiffies {
|
|
; read clock
|
|
%asm {{
|
|
phx
|
|
jsr c64.RDTIM
|
|
sta current_time
|
|
stx current_time+1
|
|
plx
|
|
}}
|
|
}
|
|
}
|
|
|
|
|
|
; ---- system stuff -----
|
|
|
|
asmsub init_system() {
|
|
; Initializes the machine to a sane starting state.
|
|
; Called automatically by the loader program logic.
|
|
%asm {{
|
|
sei
|
|
cld
|
|
;stz $00
|
|
;stz $01
|
|
;stz d1prb ; select rom bank 0
|
|
lda #$80
|
|
sta VERA_CTRL
|
|
jsr c64.IOINIT
|
|
jsr c64.RESTOR
|
|
jsr c64.CINT
|
|
lda #$90 ; black
|
|
jsr c64.CHROUT
|
|
lda #1 ; swap fg/bg
|
|
jsr c64.CHROUT
|
|
lda #$9e ; yellow
|
|
jsr c64.CHROUT
|
|
lda #147 ; clear screen
|
|
jsr c64.CHROUT
|
|
lda #0
|
|
tax
|
|
tay
|
|
clc
|
|
clv
|
|
cli
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub reset_system() {
|
|
; Soft-reset the system back to Basic prompt.
|
|
%asm {{
|
|
sei
|
|
lda #14
|
|
sta $01
|
|
stz cx16.d1prb ; bank the kernal in
|
|
jmp (cx16.RESET_VEC)
|
|
}}
|
|
}
|
|
|
|
}
|