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227 lines
5.5 KiB
ArmAsm
227 lines
5.5 KiB
ArmAsm
;
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; 2022-04-02, Karri Kaksonen
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;
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; The Atari 7800 has only 4k of RAM. So for a generic conio implementation
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; the best alternative is to use indirect tile mapping with a character
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; frame buffer
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;
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.constructor initconio
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.include "atari7800.inc"
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.include "extzp.inc"
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.import _conio_font
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.import _get_tv
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.export _screen
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.export _zones
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.export _dll
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.bss
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_screen:
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.res charsperline * screenrows
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;----------------------------------------------------------------------------
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; Macros used to generate lists
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.macro DLLentry offset, addr
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.byte offset
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.byte >addr
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.byte <addr
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.endmacro
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.macro NullHeader offset, zero
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.byte offset
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.byte zero
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.endmacro
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.macro Header addr, palwidth, hpos
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.byte <addr
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.byte palwidth
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.byte >addr
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.byte hpos
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.endmacro
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.macro XHeader addr, flags, palwidth, hpos
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.byte <addr
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.byte flags
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.byte >addr
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.byte palwidth
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.byte hpos
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.endmacro
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.macro TextZone row
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; Text
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.byte <(_screen + row * charsperline)
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.byte $60
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.byte >(_screen + row * charsperline)
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.byte 12
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.byte 0
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; Cursor
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.byte 254
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.byte 0
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.byte >_conio_font
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.byte 0
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.endmacro
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;-----------------------------------------------------------------------------
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; The Atari 7800 has only 4k of RAM. So for a generic conio implementation
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; the best alternative is to use indirect tile mapping with a character
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; frame buffer
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.data
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_zones:
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zone0: TextZone 0
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nh: NullHeader 0, 0
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zone1: TextZone 1
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NullHeader 0, 0
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zone2: TextZone 2
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NullHeader 0, 0
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zone3: TextZone 3
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NullHeader 0, 0
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zone4: TextZone 4
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NullHeader 0, 0
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zone5: TextZone 5
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NullHeader 0, 0
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zone6: TextZone 6
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NullHeader 0, 0
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zone7: TextZone 7
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NullHeader 0, 0
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zone8: TextZone 8
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NullHeader 0, 0
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zone9: TextZone 9
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NullHeader 0, 0
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zone10: TextZone 10
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NullHeader 0, 0
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zone11: TextZone 11
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NullHeader 0, 0
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zone12: TextZone 12
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NullHeader 0, 0
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zone13: TextZone 13
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NullHeader 0, 0
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zone14: TextZone 14
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NullHeader 0, 0
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zone15: TextZone 15
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NullHeader 0, 0
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zone16: TextZone 16
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NullHeader 0, 0
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zone17: TextZone 17
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NullHeader 0, 0
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zone18: TextZone 18
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NullHeader 0, 0
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zone19: TextZone 19
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NullHeader 0, 0
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zone20: TextZone 20
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NullHeader 0, 0
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zone21: TextZone 21
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NullHeader 0, 0
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zone22: TextZone 22
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NullHeader 0, 0
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zone23: TextZone 23
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NullHeader 0, 0
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zone24: TextZone 24
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NullHeader 0, 0
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zone25: TextZone 25
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NullHeader 0, 0
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zone26: TextZone 26
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NullHeader 0, 0
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zone27: TextZone 27
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NullHeader 0, 0
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_dll:
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PALscanlines: ; 25 lines
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DLLentry 15, nh
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DLLentry 8, nh
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Topscanlines: ; 9 lines
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DLLentry 8, nh
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Displaylines:
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DLLentry $80+7, zone0 ; NMI interrupt from end of prev zone
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DLLentry 7, zone1
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DLLentry 7, zone2
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DLLentry 7, zone3
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DLLentry 7, zone4
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DLLentry 7, zone5
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DLLentry 7, zone6
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DLLentry 7, zone7
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DLLentry 7, zone8
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DLLentry 7, zone9
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DLLentry 7, zone10
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DLLentry 7, zone11
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DLLentry 7, zone12
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DLLentry 7, zone13
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DLLentry 7, zone14
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DLLentry 7, zone15
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DLLentry 7, zone16
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DLLentry 7, zone17
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DLLentry 7, zone18
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DLLentry 7, zone19
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DLLentry 7, zone20
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DLLentry 7, zone21
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DLLentry 7, zone22
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DLLentry 7, zone23
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DLLentry 7, zone24
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DLLentry 7, zone25
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DLLentry 7, zone26
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DLLentry 7, zone27
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Bottomscanlines:
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DLLentry $80+15, nh ; NMI interrupt at end of display
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DLLentry 9, nh
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DLLentry 15, nh
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DLLentry 8, nh
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;-----------------------------------------------------------------------------
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; Set up the screen to 320a mode
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;
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.segment "ONCE"
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CTRL_MODE160 .set 0
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CTRL_MODEAC .set 3
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CTRL_KANGOFF .set 0
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CTRL_BCBLACK .set 0
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CTRL_CHAR1B .set 0
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CTRL_CHAR2B .set $10
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CTRL_DMAON .set $40
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CTRL_CKOFF .set 0
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;-----------------------------------------------------------------------------
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; Initialize the conio display lists and zones
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;
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.proc initconio
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jsr _get_tv
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bne pal
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lda #<Topscanlines
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sta DPPL
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lda #>Topscanlines
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sta DPPH
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jmp vblankon
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pal: lda #<PALscanlines
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sta DPPL
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lda #>PALscanlines
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sta DPPH
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vblankon:
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lda MSTAT
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bmi vblankon
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vblankoff:
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lda MSTAT
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bpl vblankoff
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lda #>_conio_font
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sta CHBASE
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lda #(CTRL_MODE160 | CTRL_KANGOFF | CTRL_BCBLACK | CTRL_CHAR2B | CTRL_DMAON | CTRL_CKOFF)
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sta CTRL
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lda #$00 ; Black background
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sta BKGRND
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sta CURS_X
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sta CURS_Y
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lda #$33 ; Red
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sta P0C1
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lda #$c8 ; Green
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sta P0C2
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lda #$0f ; White
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sta P0C3
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rts
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.endproc
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