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drv_a40.asm
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drv_a40.asm
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;original Atari 40col gr0 driver
SCREEN_LINES_TOTAL = 24
SCREEN_WIDTH_CHARS = 40
SCREEN_WIDTH_BYTES = SCREEN_WIDTH_CHARS
SCREEN_WIDTH_CHARS_PRINTED = SCREEN_WIDTH_CHARS-1
START_OF_LAST_LINE = [video_ram + (SCREEN_LINES_TOTAL-1) * SCREEN_WIDTH_CHARS]
video_ram = $c000 - ( screen_lines_total * screen_width_bytes )
graphics_start_page = >video_ram
; ---------------------------------------------------------------------------
dlist: .BYTE $70
.BYTE $70
.if ZVER = 3
.BYTE $60
.else
.BYTE $70
.endif
.BYTE $40+2
.WORD video_ram
.if ZVER = 3
.BYTE $10
.endif
:[SCREEN_LINES_TOTAL-1] .BYTE 2 ;one line is above in $42 instruction
.BYTE $41
.WORD dlist
; ---------------------------------------------------------------------------
line_addr_00 = video_ram + $00 * SCREEN_WIDTH_CHARS
line_addr_01 = video_ram + $01 * SCREEN_WIDTH_CHARS
line_addr_02 = video_ram + $02 * SCREEN_WIDTH_CHARS
line_addr_03 = video_ram + $03 * SCREEN_WIDTH_CHARS
line_addr_04 = video_ram + $04 * SCREEN_WIDTH_CHARS
line_addr_05 = video_ram + $05 * SCREEN_WIDTH_CHARS
line_addr_06 = video_ram + $06 * SCREEN_WIDTH_CHARS
line_addr_07 = video_ram + $07 * SCREEN_WIDTH_CHARS
line_addr_08 = video_ram + $08 * SCREEN_WIDTH_CHARS
line_addr_09 = video_ram + $09 * SCREEN_WIDTH_CHARS
line_addr_0A = video_ram + $0A * SCREEN_WIDTH_CHARS
line_addr_0B = video_ram + $0B * SCREEN_WIDTH_CHARS
line_addr_0C = video_ram + $0C * SCREEN_WIDTH_CHARS
line_addr_0D = video_ram + $0D * SCREEN_WIDTH_CHARS
line_addr_0E = video_ram + $0E * SCREEN_WIDTH_CHARS
line_addr_0F = video_ram + $0F * SCREEN_WIDTH_CHARS
line_addr_10 = video_ram + $10 * SCREEN_WIDTH_CHARS
line_addr_11 = video_ram + $11 * SCREEN_WIDTH_CHARS
line_addr_12 = video_ram + $12 * SCREEN_WIDTH_CHARS
line_addr_13 = video_ram + $13 * SCREEN_WIDTH_CHARS
line_addr_14 = video_ram + $14 * SCREEN_WIDTH_CHARS
line_addr_15 = video_ram + $15 * SCREEN_WIDTH_CHARS
line_addr_16 = video_ram + $16 * SCREEN_WIDTH_CHARS
line_addr_17 = video_ram + $17 * SCREEN_WIDTH_CHARS
videomem_ptrs_lo:
.BYTE <line_addr_00
.BYTE <line_addr_01
.BYTE <line_addr_02
.BYTE <line_addr_03
.BYTE <line_addr_04
.BYTE <line_addr_05
.BYTE <line_addr_06
.BYTE <line_addr_07
.BYTE <line_addr_08
.BYTE <line_addr_09
.BYTE <line_addr_0A
.BYTE <line_addr_0B
.BYTE <line_addr_0C
.BYTE <line_addr_0D
.BYTE <line_addr_0E
.BYTE <line_addr_0F
.BYTE <line_addr_10
.BYTE <line_addr_11
.BYTE <line_addr_12
.BYTE <line_addr_13
.BYTE <line_addr_14
.BYTE <line_addr_15
.BYTE <line_addr_16
.BYTE <line_addr_17
videomem_ptrs_hi:
.BYTE >line_addr_00
.BYTE >line_addr_01
.BYTE >line_addr_02
.BYTE >line_addr_03
.BYTE >line_addr_04
.BYTE >line_addr_05
.BYTE >line_addr_06
.BYTE >line_addr_07
.BYTE >line_addr_08
.BYTE >line_addr_09
.BYTE >line_addr_0A
.BYTE >line_addr_0B
.BYTE >line_addr_0C
.BYTE >line_addr_0D
.BYTE >line_addr_0E
.BYTE >line_addr_0F
.BYTE >line_addr_10
.BYTE >line_addr_11
.BYTE >line_addr_12
.BYTE >line_addr_13
.BYTE >line_addr_14
.BYTE >line_addr_15
.BYTE >line_addr_16
.BYTE >line_addr_17
; ---------------------------------------------------------------------------
graphics_init:
LDA #$94
STA COLOR2
STA COLOR4
LDA #<dlist
STA SDLSTL
LDA #>dlist
STA SDLSTH
RTS
; ---------------------------------------------------------------------------
ASC2INT: .BYTE %01000000
.BYTE %00000000
.BYTE %00100000
.BYTE %01100000
;in A is atascii character
graphics_put_char:
TAY
ROL
ROL
ROL
ROL
AND #03
TAX
TYA
AND #%10011111
ORA ASC2INT,X
;right now we have internal code in hands
PHA
LDX ROWCRS
LDA videomem_ptrs_lo,X
STA gpc_ptch1+1
LDA videomem_ptrs_hi,X
STA gpc_ptch1+2
LDY COLCRS
PLA
gpc_ptch1: STA.a $0000,Y
RTS
; ---------------------------------------------------------------------------
;in X is from
graphics_scroll_partially:
loop_over_screen:
CPX #[SCREEN_LINES_TOTAL-1]
BEQ clear_last_line
LDA videomem_ptrs_lo,X
STA a4sp_2+1
LDA videomem_ptrs_hi,X
STA a4sp_2+2
INX
LDA videomem_ptrs_lo,X
STA a4sp_1+1
LDA videomem_ptrs_hi,X
STA a4sp_1+2
LDY #[SCREEN_WIDTH_CHARS-1]
loop_over_row:
a4sp_1: LDA.a $0000,Y
a4sp_2: STA.a $0000,Y
DEY
BPL loop_over_row
BMI loop_over_screen
clear_last_line:
LDX #SCREEN_WIDTH_CHARS
LDA #0
loop_clearing_last_line:
STA START_OF_LAST_LINE,X
DEX
BPL loop_clearing_last_line
RTS
; ---------------------------------------------------------------------------
a40_line: .BYTE 0
graphics_cls:
LDX #0
LDY #SCREEN_LINES_TOTAL
graphics_cls_partial:
STY a40_line
a4cp_2:
LDA videomem_ptrs_lo,X
STA a4cp_1+1
LDA videomem_ptrs_hi,X
STA a4cp_1+2
LDY #SCREEN_WIDTH_CHARS
LDA #0
a4cp_1: STA.a $0000,Y
DEY
BPL a4cp_1
INX
CPX a40_line
BNE a4cp_2
a4cp_3: RTS
; ---------------------------------------------------------------------------
inverted_MORE_string:
.if CZ_LANG
DTA d 'V)ce$'*
.else
DTA d '[MORE]'*
.endif
more_length = * - inverted_MORE_string
graphics_display_more:
LDX #more_length - 1
loc_1D3A:
LDA inverted_MORE_string,X
STA START_OF_LAST_LINE,X
DEX
BPL loc_1D3A
RTS
graphics_erase_more:
LDX #more_length - 1
LDA #0
loc_1D53:
STA START_OF_LAST_LINE,X
DEX
BPL loc_1D53
RTS
;z3 has different dlist with one empty scanline, hence the difference
.if ZVER = 3
pmg_line_move = 40
.else
pmg_line_move = 39
.endif
graphics_pmg_cursor_on .macro
LDA COLCRS ;moves cursor
ASL
ASL
CLC
ADC #$30
STA HPOSM0 ;moves cursor based on COLCRS
LDA ROWCRS
ASL
ASL
ASL
CLC
ADC #pmg_line_move
TAY ;converts ROWCRS to byte to display pmg cursor
LDA #3
STA pmg_cursor_curr_shape_f8
STA pmg_missiles_mem,Y
.endm
graphics_pmg_cursor_xor .macro
LDA pmg_cursor_curr_shape_f8
EOR #3
STA pmg_cursor_curr_shape_f8
STA pmg_missiles_mem,Y
.endm
graphics_pmg_cursor_off .macro
LDA ROWCRS
ASL
ASL
ASL
CLC
ADC #pmg_line_move
TAY ;converts ROWCRS to byte to display pmg cursor
LDA #0
STA pmg_missiles_mem,Y
.endm
graphics_pmg_color = $0C
graphics_pmg_size = 1