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Support for 60K MTU setup, work on asm setpixel
This commit is contained in:
Dave Plummer
parent
9c00f6628b
commit
df46a00008
41
cfg/kim1-mtu60k.cfg
Normal file
41
cfg/kim1-mtu60k.cfg
Normal file
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@ -0,0 +1,41 @@
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# kim1-mtu60k.cfg (4k)
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#
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# for expanded KIM-1 w/ K-1008 Graphics and 60K RAM
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#
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# ld65 --config kim1-mtu60k.cfg -o <prog>.bin <prog>.o
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FEATURES {
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STARTADDRESS: default = $2000;
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CONDES: segment = STARTUP,
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type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__;
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CONDES: segment = STARTUP,
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type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__;
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}
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SYMBOLS {
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__STACKSIZE__: type = weak, value = $0080; # 128 byte program stack
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__STARTADDRESS__: type = export, value = %S;
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}
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MEMORY {
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ZP: file = %O, define = yes, start = $0000, size = $00EE;
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CPUSTACK: file = "", define = yes, start = $0100, size = $0100;
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RAM: file = %O, define = yes, start = %S, size = $E000 - %S - __STACKSIZE__;
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MAINROM: file = "", define = yes, start = $E000, size = $1000;
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TOP: file = "", define = yes, start = $F000, size = $1000;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp, define = yes;
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STARTUP: load = RAM, type = ro, define = yes;
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CODE: load = RAM, type = ro, define = yes;
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RODATA: load = RAM, type = ro, define = yes;
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ONCE: load = RAM, type = ro, define = yes;
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DATA: load = RAM, type = rw, define = yes;
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BSS: load = RAM, type = bss, define = yes;
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}
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@ -57,13 +57,13 @@ subs.o: subs.asm
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$(AS) subs.asm -o subs.o
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kimLife.bin: kimLife.c
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$(CL) -t kim1 -C kim1-60k.cfg -Oi -o kimLife.bin kimLife.c
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$(CL) -t kim1 -C kim1-mtu60k.cfg -Oi -o kimLife.bin kimLife.c
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kimTest.bin: kimTest.c
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$(CL) -t kim1 -C kim1-60k.cfg -Oi -o kimTest.bin kimTest.c
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kimGFX.bin: kimGFX.c ramfont.c subs.o
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$(CL) -t kim1 -C kim1-60k.cfg -Oi -o kimGFX.bin kimGFX.c subs.o
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$(CL) -t kim1 -C kim1-mtu60k.cfg -Oi -o kimGFX.bin kimGFX.c subs.o
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kimSieve.bin: kimSieve.c
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$(CL) -t kim1 -C kim1-60k.cfg -O -o kimSieve.bin kimSieve.c
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@ -17,6 +17,10 @@
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SCREEN = $A000
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.segment "ZEROPAGE"
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temp: .res 1
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btpt: .res 1
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dest = $02
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dest_lo = dest
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dest_hi = dest+1
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@ -25,6 +29,132 @@ src = $04
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src_lo = src
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src_hi = src+1
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adp1 = $06
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adp1_lo = adp1
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adp1_hi = adp1+1
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adp2 = $08
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adp2_lo = adp2
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adp2_hi = adp2+1
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x1cord = $0A
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x1cord_lo = x1cord
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x1cord_hi = x1cord+1
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y1cord = $0C
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y1cord_lo = y1cord
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y1cord_hi = y1cord+1
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.segment "CODE"
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;-----------------------------------------------------------------------------------
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; GetPixelAddress - Calculate the address of a pixel in the video memory
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;-----------------------------------------------------------------------------------
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; Based on MTU PIXADR code
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;-----------------------------------------------------------------------------------
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; x - x1cord (16-bit)
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; y - y1cord (16-bit)
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; adp2 - address of pixel to set (16-bit)
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;-----------------------------------------------------------------------------------
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_GetPixelAddress:
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lda x1cord ; compute bit address first
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sta adp1 ; also transfer x1cord to adp1
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and #$07 ; + which is simply the low 3 bits of x
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sta btpt
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lda x1cord+1 ; finish transferring x1cord to adp1
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sta adp1+1
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lsr adp1+1 ; double shift adp1 right 3 to get
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ror adp1 ; int(xcord/8 )
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lsr adp1+1
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ror adp1
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lsr adp1+1
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ror adp1
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lda #199 ; transfer (199-y1cord) to adp2
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sec ; and temporary storage
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sbc y1cord
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sta adp2
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sta temp
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lda #0
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sbc y1cord+1
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sta adp2+1
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sta temp+1
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asl adp2 ; compute 40*(199-y1cord)
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rol adp2+1 ; 2*(199-y1cord)
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asl adp2
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rol adp2+1 ; 4*(199-y1cord)
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lda adp2 ; add in temporary save of (199-y1cord)
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clc ; to make 5*(199-y1cord)
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adc temp
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sta adp2
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lda adp2+1
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adc temp+1
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sta adp2+1 ; 5*(199-y1cord)
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asl adp2 ; 10*(199-y1cord)
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rol adp2+1
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asl adp2 ; 20#(199-y1cord)
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rol adp2+1
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asl adp2 ; 40*(199-y1cord)
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rol adp2+1
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lda adp2 ; add in int(x1cord/8) computed earlier
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clc
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adc adp1
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sta adp1
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lda adp2+1
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adc adp1+1
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adc #>SCREEN ; add in base vidscreen address
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sta adp1+1 ; final result
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rts ; return
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;-----------------------------------------------------------------------------------
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; Mask tables for individual pixel subroutines
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;
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; MSKTB1 is a table of 1 bits corresponding to bit numbers
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; MSKTB2 is a table of 0 bits corresponding to bit numbers
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;-----------------------------------------------------------------------------------
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msktb1: .byte $80,$40,$20,$10,$08,$04,$02,$01
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msktb2: .byte $7F,$BF,$DF,$EF,$F7,$FB,$FD,$FE
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;-----------------------------------------------------------------------------------
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; SetPixel - Set a pixel in the video memory
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;-----------------------------------------------------------------------------------
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; x - x1cord (16-bit)
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; y - y1cord (16-bit)
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;-----------------------------------------------------------------------------------
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; Mask tables for individual pixel subroutines
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;-----------------------------------------------------------------------------------
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_SetPixel: jsr _GetPixelAddress
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ldy btpt ; get bit number in y
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lda msktb1,y ; get a byte with that bit =1, others =0
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ldy #0
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ora (adp1),y ; combine the bit with the addressed vm
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sta (adp1),y ; byte
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rts
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;-----------------------------------------------------------------------------------
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; ClearPixel - Clears a pixel in the video memory
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;-----------------------------------------------------------------------------------
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; x - x1cord (16-bit)
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; y - y1cord (16-bit)
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;-----------------------------------------------------------------------------------
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_ClearPixel: jsr _GetPixelAddress
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ldy btpt ; get bit number in y
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lda msktb2,y ; get a byte with that bit =0, others =1
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ldy #0
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and (adp1),y ; remove the bit from the addressed vm
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sta (adp1),y ; byte
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rts
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;-----------------------------------------------------------------------------------
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; ClearScreen - Clears the entire video memory (and thus the screen)
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;-----------------------------------------------------------------------------------
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_ClearScreen:
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lda #$00
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