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atari5200 update: simple conio "hello world" works now

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This commit is contained in:
Christian Groessler 2014-04-25 03:02:44 +02:00
parent ec417c0dc5
commit 92b32d7d0e
7 changed files with 252 additions and 14 deletions
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7
asminc/atari5200.inc
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@ -55,10 +55,11 @@ PADDL5 = $16 ;POT5 "
PADDL6 = $17 ;POT6 "
PADDL7 = $18 ;POT7 "
; cc65 runtime zero page variables
.importzp COLCRS_5200
.importzp ROWCRS_5200
COLCRS_5200 = $19
ROWCRS_5200 = $1A
SAVMSC = $1B ; pointer to screen memory (conio)
;-------------------------------------------------------------------------
; Page #2

2
cfg/atari5200.cfg
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@ -5,7 +5,7 @@ SYMBOLS {
__RESERVED_MEMORY__: type = export, value = $0200; # space for display list and 20x24 screen buffer
}
MEMORY {
ZP: file = "", start = $0019, size = $00E7, define = yes;
ZP: file = "", start = $001D, size = $00E3, define = yes;
RAM: file = "", start = $021C, size = $4000 - __STACKSIZE__ - __RESERVED_MEMORY__ - $021C, define = yes;
ROM: file = %O, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - $18, define = yes, fill = yes, fillval = $FF;
CARTNAME: file = %O, start = $BFE8, size = $0014 fill = yes, fillval = $40;

67
libsrc/atari5200/conioscreen.s Normal file
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@ -0,0 +1,67 @@
.include "atari5200.inc"
SCREEN_BUF_SIZE = 20 * 24
SCREEN_BUF = $4000 - SCREEN_BUF_SIZE
.code
.export screen_setup_20x24
screen_setup_20x24:
; initialize SAVMSC
lda #<SCREEN_BUF
sta SAVMSC
lda #>SCREEN_BUF
sta SAVMSC+1
; initialize cursor position
lda #0
sta COLCRS_5200
sta ROWCRS_5200
; clear screen buffer
ldy #<(SCREEN_BUF_SIZE-1)
ldx #>(SCREEN_BUF_SIZE-1)
clrscr: sta (SAVMSC),y
dey
cpy #$FF
bne clrscr
dex
cpx #$FF
bne clrscr
; set display list
lda #<dlist
sta SDLSTL
lda #>dlist
sta SDLSTH
rts
.segment "RODATA"
; display list for 20x24 text mode
dlist: .repeat 3
.byte DL_BLK8
.endrepeat
.byte DL_CHR20x8x2 | DL_LMS
.word SCREEN_BUF
.repeat 23
.byte DL_CHR20x8x2
.endrepeat
.byte DL_JVB
.word dlist
; end of display list
.assert ((* >> 10) = (dlist >> 10)), error, "Display list crosses 1K boundary"
.end

95
libsrc/atari5200/cputc.s Normal file
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@ -0,0 +1,95 @@
;
; adapted from Atari version
; Christian Groessler, 2014
;
; void cputcxy (unsigned char x, unsigned char y, char c);
; void cputc (char c);
;
.include "atari5200.inc"
.export _cputcxy, _cputc
.export plot, cputdirect, putchar
.import popa, _gotoxy, mul20
.importzp ptr4
.import setcursor
.constructor screen_setup, 26
.import screen_setup_20x24
screen_setup = screen_setup_20x24
_cputcxy:
pha ; Save C
jsr popa ; Get Y
jsr _gotoxy ; Set cursor, drop x
pla ; Restore C
_cputc:
cmp #$0D ; CR
bne L4
lda #0
sta COLCRS_5200
beq plot ; return
L4: cmp #$0A ; LF
beq newline
cmp #ATEOL ; Atari-EOL?
beq newline
tay
rol a
rol a
rol a
rol a
and #3
tax
tya
and #$9f
ora ataint,x
cputdirect: ; accepts screen code
jsr putchar
; advance cursor
inc COLCRS_5200
lda COLCRS_5200
cmp #40
bcc plot
lda #0
sta COLCRS_5200
.export newline
newline:
inc ROWCRS_5200
lda ROWCRS_5200
cmp #24
bne plot
lda #0
sta ROWCRS_5200
plot: jsr setcursor
ldy COLCRS_5200
ldx ROWCRS_5200
rts
; turn off cursor, update screen, turn on cursor
putchar:
pha ; save char
lda ROWCRS_5200
jsr mul20 ; destroys tmp4
clc
adc SAVMSC ; add start of screen memory
sta ptr4
txa
adc SAVMSC+1
sta ptr4+1
pla ; get char again
ldy COLCRS_5200
sta (ptr4),y
jmp setcursor
.rodata
ataint: .byte 64,0,32,96

13
libsrc/atari5200/crt0.s
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@ -1,7 +1,7 @@
;
; Startup code for cc65 (Atari5200 version)
;
; by Christian Groessler (chris@groessler.org), 2014
; Christian Groessler (chris@groessler.org), 2014
;
.export _exit, start
@ -15,12 +15,6 @@
.include "zeropage.inc"
.include "atari5200.inc"
; ------------------------------------------------------------------------
; Place the startup code in a special segment.
.segment "STARTUP"
start:
; Clear the BSS data
@ -49,7 +43,6 @@ start:
_exit: jsr donelib ; Run module destructors
; Reset the NES
jmp start
; A 5200 program isn't supposed to exit.
halt: jmp halt

33
libsrc/atari5200/mul20.s Normal file
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@ -0,0 +1,33 @@
;
; Christian Groessler, April 2014
;
; mul20
; multiplies A by 20 and returns result in AX
; uses tmp4
.importzp tmp4
.export mul20,loc_tmp
.proc mul20
ldx #0
stx tmp4
sta loc_tmp
asl a
rol tmp4
asl a
rol tmp4 ; val * 4
adc loc_tmp
bcc L1
inc tmp4 ; val * 5
L1: asl a
rol tmp4 ; val * 10
asl a
rol tmp4 ; val * 20
ldx tmp4
rts
.endproc
.bss
loc_tmp:.res 1

49
libsrc/atari5200/setcursor.s Normal file
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@ -0,0 +1,49 @@
.include "atari5200.inc"
.export setcursor
.import cursor ; from conio/_cursor.s
.proc setcursor
rts
.if 0
ldy #0
lda ROWCRS_5200
jsr mul20
clc
; adc SAVMSC ; add start of screen memory
; sta OLDADR
txa
; adc SAVMSC+1
; sta OLDADR+1
lda COLCRS_5200
; adc OLDADR
; sta OLDADR
bcc nc
; inc OLDADR+1
nc:;;; lda (OLDADR),y
; sta OLDCHR
ldx cursor ; current cursor setting as requested by the user
beq off
ldx #0
beq cont
off: inx
cont:;;; stx CRSINH ; update system variable
beq turnon
and #$7f ; clear high bit / inverse flag
finish: ;;;sta (OLDADR),y ; update on-screen display
rts
turnon: ora #$80 ; set high bit / inverse flag
bne finish
.endif
.endproc