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https://github.com/stid/woz64.git
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Woz alpha
This commit is contained in:
stid
parent
6013ca5d87
commit
65687a91fd
90
keyb2.asm
90
keyb2.asm
@ -12,39 +12,39 @@
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init:
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lda #64
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sta MemMap.KEYB2_SPACE.SYS_Lstx
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sta MemMap.KEYB2_SPACE.SYS_Sfdx
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sta MemMap.KEYB2.SYS_Lstx
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sta MemMap.KEYB2.SYS_Sfdx
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lda #cSYS_DelayValue
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sta MemMap.KEYB2_SPACE.SYS_Delay
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sta MemMap.KEYB2.SYS_Delay
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lda #6
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sta MemMap.KEYB2_SPACE.SYS_Kount
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sta MemMap.KEYB2.SYS_Kount
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lda #0
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sta MemMap.KEYB2_SPACE.SYS_Shflag
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sta MemMap.KEYB2_SPACE.SYS_Lstshf
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sta MemMap.KEYB2.SYS_Shflag
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sta MemMap.KEYB2.SYS_Lstshf
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sta MemMap.KEYB2_SPACE.SYS_Ndx
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sta MemMap.KEYB2.SYS_Ndx
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lda #10
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sta MemMap.KEYB2_SPACE.SYS_Xmax
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sta MemMap.KEYB2.SYS_Xmax
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// CLODE TO RAM
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lda #<cloneStart
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sta MemMap.MEMORY_SPACE.from
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sta MemMap.MEMORY.from
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lda #>cloneStart
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sta MemMap.MEMORY_SPACE.from+1
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sta MemMap.MEMORY.from+1
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lda #<$1000
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sta MemMap.MEMORY_SPACE.to
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sta MemMap.MEMORY.to
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lda #>$1000
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sta MemMap.MEMORY_SPACE.to+1
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sta MemMap.MEMORY.to+1
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lda #<cloneEnd-ReadKeyb
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sta MemMap.MEMORY_SPACE.size+1
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sta MemMap.MEMORY.size+1
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lda #>cloneEnd-ReadKeyb
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sta MemMap.MEMORY_SPACE.size
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sta MemMap.MEMORY.size
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jsr Memory.clone
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@ -114,10 +114,10 @@ ReadKeyb:
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// Clear Shift Flag
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lda #$40
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sta MemMap.KEYB2_SPACE.SYS_Sfdx
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sta MemMap.KEYB2.SYS_Sfdx
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lda #0
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sta MemMap.KEYB2_SPACE.SYS_Shflag
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sta MemMap.KEYB2.SYS_Shflag
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sta CIA1_KeybWrite
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ldx CIA1_KeybRead
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@ -127,7 +127,7 @@ ReadKeyb:
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ldy #$00
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lda #7
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sta MemMap.KEYB2_SPACE.KeyR
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sta MemMap.KEYB2.KeyR
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lda #cKeybW_Row1
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sta @SMC_Row + 1
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@ -155,11 +155,11 @@ ReadKeyb:
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beq @NotShift // Stop Key
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// Accumulate shift key types (SHIFT=1, COMM=2, CTRL=4)
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ora MemMap.KEYB2_SPACE.SYS_Shflag
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sta MemMap.KEYB2_SPACE.SYS_Shflag
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ora MemMap.KEYB2.SYS_Shflag
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sta MemMap.KEYB2.SYS_Shflag
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bpl @SMC_A
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@NotShift: sty MemMap.KEYB2_SPACE.SYS_Sfdx
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@NotShift: sty MemMap.KEYB2.SYS_Sfdx
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@SMC_A: lda #0
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@ -169,63 +169,63 @@ ReadKeyb:
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sec
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rol @SMC_Row + 1
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dec MemMap.KEYB2_SPACE.KeyR
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dec MemMap.KEYB2.KeyR
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bpl @SMC_Row
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jmp @ProcKeyImg
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// Handles the key repeat
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@Process: ldy MemMap.KEYB2_SPACE.SYS_Sfdx
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@Process: ldy MemMap.KEYB2.SYS_Sfdx
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@SMC_Key: lda $FFFF,Y
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tax
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cpy MemMap.KEYB2_SPACE.SYS_Lstx
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cpy MemMap.KEYB2.SYS_Lstx
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beq @SameKey
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ldy #cSYS_DelayValue
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sty MemMap.KEYB2_SPACE.SYS_Delay // Repeat delay counter
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sty MemMap.KEYB2.SYS_Delay // Repeat delay counter
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bne @Cleanup
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@SameKey: and #$7F
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ldy MemMap.KEYB2_SPACE.SYS_Delay
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ldy MemMap.KEYB2.SYS_Delay
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beq @EndDelay
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dec MemMap.KEYB2_SPACE.SYS_Delay
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dec MemMap.KEYB2.SYS_Delay
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bne @Exit
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@EndDelay: dec MemMap.KEYB2_SPACE.SYS_Kount
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@EndDelay: dec MemMap.KEYB2.SYS_Kount
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bne @Exit
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ldy #$04
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sty MemMap.KEYB2_SPACE.SYS_Kount
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ldy MemMap.KEYB2_SPACE.SYS_Ndx
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sty MemMap.KEYB2.SYS_Kount
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ldy MemMap.KEYB2.SYS_Ndx
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dey
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bpl @Exit
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// Updates the previous key and shift storage
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@Cleanup: ldy MemMap.KEYB2_SPACE.SYS_Sfdx
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sty MemMap.KEYB2_SPACE.SYS_Lstx
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ldy MemMap.KEYB2_SPACE.SYS_Shflag
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sty MemMap.KEYB2_SPACE.SYS_Lstshf
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@Cleanup: ldy MemMap.KEYB2.SYS_Sfdx
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sty MemMap.KEYB2.SYS_Lstx
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ldy MemMap.KEYB2.SYS_Shflag
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sty MemMap.KEYB2.SYS_Lstshf
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cpx #$FF
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beq @Exit
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txa
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ldx MemMap.KEYB2_SPACE.SYS_Ndx
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cpx MemMap.KEYB2_SPACE.SYS_Xmax
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ldx MemMap.KEYB2.SYS_Ndx
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cpx MemMap.KEYB2.SYS_Xmax
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bcs @Exit
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sta MemMap.KEYB2_SPACE.SYS_Keyd,X
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sta MemMap.KEYB2.SYS_Keyd,X
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inx
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stx MemMap.KEYB2_SPACE.SYS_Ndx
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stx MemMap.KEYB2.SYS_Ndx
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@Exit: lda #$7F
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sta CIA1_KeybWrite
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rts
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@ProcKeyImg:
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lda MemMap.KEYB2_SPACE.SYS_Shflag
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lda MemMap.KEYB2.SYS_Shflag
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cmp #$03 // C= + SHIFT
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bne @SetDecodeTable
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cmp MemMap.KEYB2_SPACE.SYS_Lstshf
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cmp MemMap.KEYB2.SYS_Lstshf
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beq @Exit
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@SetDecodeTable:
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@ -241,21 +241,21 @@ ReadKeyb:
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jmp @Process
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// --------------------------
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GetKey: lda MemMap.KEYB2_SPACE.SYS_Ndx
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GetKey: lda MemMap.KEYB2.SYS_Ndx
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bne @IsKey
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@NoKey: lda #255 // Null
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sec
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rts
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@IsKey: ldy MemMap.KEYB2_SPACE.SYS_Keyd
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@IsKey: ldy MemMap.KEYB2.SYS_Keyd
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ldx #0
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@Loop: lda MemMap.KEYB2_SPACE.SYS_Keyd + 1,X
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sta MemMap.KEYB2_SPACE.SYS_Keyd,X
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@Loop: lda MemMap.KEYB2.SYS_Keyd + 1,X
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sta MemMap.KEYB2.SYS_Keyd,X
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inx
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cpx MemMap.KEYB2_SPACE.SYS_Ndx
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cpx MemMap.KEYB2.SYS_Ndx
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bne @Loop
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dec MemMap.KEYB2_SPACE.SYS_Ndx
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dec MemMap.KEYB2.SYS_Ndx
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tya
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clc
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rts
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20
main.asm
20
main.asm
@ -17,6 +17,7 @@ BasicUpstart2(start)
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#import "screen.asm"
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#import "keyb2.asm"
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#import "hex.asm"
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#import "shell.asm"
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* = * "Kernel Start"
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@ -43,14 +44,20 @@ Raster: cmp $D012
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jsr Keyboard2.ReadKeyb
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jsr Keyboard2.GetKey
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bcs Skip
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cmp #$0d
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bne inputChar
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.break
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// Execute Item
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jsr Shell.push
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jsr Shell.wozExec
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lda #$0d
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jsr Screen.petToScreen
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cPrint()
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jsr Shell.clear
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jmp loop
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inputChar:
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jsr Shell.push
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jsr Screen.petToScreen
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//jsr Hex.byteToHex
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//cPrint()
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//txa
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cPrint()
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@ -65,6 +72,7 @@ initApp: {
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SetBackgroundColor(constants.BORDER_COLOR)
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jsr Screen.init
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jsr Keyboard2.init
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jsr Shell.init
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rts
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}
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14
math.asm
14
math.asm
@ -6,25 +6,25 @@
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* = * "Math Routines"
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multiply: {
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stx MemMap.MATH_SPACE.multiTmpX
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stx MemMap.MATH.multiTmpX
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pha
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lda #$00
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ldx #$08
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clc
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m0: bcc.r m1
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clc
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adc MemMap.MATH_SPACE.factor2
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adc MemMap.MATH.factor2
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m1: ror
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ror MemMap.MATH_SPACE.factor1
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ror MemMap.MATH.factor1
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dex
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bpl.r m0
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ldx MemMap.MATH_SPACE.factor1
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ldx MemMap.MATH.factor1
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sta MemMap.MATH_SPACE.result
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stx MemMap.MATH_SPACE.result+1
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sta MemMap.MATH.result
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stx MemMap.MATH.result+1
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pla
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ldx MemMap.MATH_SPACE.multiTmpX
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ldx MemMap.MATH.multiTmpX
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rts
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32
mem_map.asm
32
mem_map.asm
@ -4,23 +4,24 @@
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.const ZPAGE_BASE = $2
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.namespace SCREEN_SPACE {
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.namespace SCREEN {
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.label TempVideoPointer = ZPAGE_BASE // 2 bytes
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.label TempStringPointer = ZPAGE_BASE+2 // 2 bytes
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.label CursorCol = ZPAGE_BASE+4 // 1 byte
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.label CursorRow = ZPAGE_BASE+5 // 1 byte
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.label tempY = ZPAGE_BASE+6 // 1 byte
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.label tempX = ZPAGE_BASE+7 // 1 byte
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.label cTempY = ZPAGE_BASE+8 // 1 byte
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}
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.namespace MATH_SPACE {
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.label factor1 = ZPAGE_BASE+8 // 1 byte
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.label factor2 = ZPAGE_BASE+9 // 1 byte
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.label multiTmpX = ZPAGE_BASE+10 // 1 byte
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.label result = ZPAGE_BASE+11 // 2 bytes
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.namespace MATH {
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.label factor1 = ZPAGE_BASE+9 // 1 byte
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.label factor2 = ZPAGE_BASE+10 // 1 byte
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.label multiTmpX = ZPAGE_BASE+11 // 1 byte
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.label result = ZPAGE_BASE+12 // 2 bytes
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}
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.namespace KEYB2_SPACE {
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.namespace KEYB2 {
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.label KeyR = ZPAGE_BASE+37 // 1 bytes
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.label SYS_Keyd = ZPAGE_BASE+38 // 10 bytes
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.label SYS_Ndx = ZPAGE_BASE+48 // 1 bytes
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@ -33,8 +34,23 @@
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.label SYS_Lstshf = ZPAGE_BASE+55 // 1 bytes
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}
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.namespace MEMORY_SPACE {
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.namespace MEMORY {
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.label from = ZPAGE_BASE+56 // 2 bytes
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.label to = ZPAGE_BASE+58 // 2 bytes
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.label size = ZPAGE_BASE+60 // 2 bytes
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}
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.namespace SHELL {
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.label pos = ZPAGE_BASE+62 // 1 bytes
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.label MODE = ZPAGE_BASE+63 // 1 bytes
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.label L = ZPAGE_BASE+64 // 1 bytes
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.label H = ZPAGE_BASE+65 // 1 bytes
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.label YSAV = ZPAGE_BASE+66 // 1 bytes
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.label STL = ZPAGE_BASE+67 // 1 bytes
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.label STH = ZPAGE_BASE+68 // 1 bytes
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.label XAML = ZPAGE_BASE+69 // 1 bytes
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.label XAMH = ZPAGE_BASE+70 // 1 bytes
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.label buffer = $3000 // 256 bytes
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}
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16
memory.asm
16
memory.asm
@ -13,20 +13,20 @@
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//
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clone:
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ldy #0
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ldx MemMap.MEMORY_SPACE.size
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ldx MemMap.MEMORY.size
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beq md2
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md1: lda (MemMap.MEMORY_SPACE.from),y // move a page at a time
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sta (MemMap.MEMORY_SPACE.to),y
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md1: lda (MemMap.MEMORY.from),y // move a page at a time
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sta (MemMap.MEMORY.to),y
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iny
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bne md1
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inc MemMap.MEMORY_SPACE.from+1
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inc MemMap.MEMORY_SPACE.to+1
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inc MemMap.MEMORY.from+1
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inc MemMap.MEMORY.to+1
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dex
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bne md1
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md2: ldx MemMap.MEMORY_SPACE.size+1
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md2: ldx MemMap.MEMORY.size+1
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beq md4
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md3: lda (MemMap.MEMORY_SPACE.from),y // move the remaining bytes
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sta (MemMap.MEMORY_SPACE.to),y
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md3: lda (MemMap.MEMORY.from),y // move the remaining bytes
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sta (MemMap.MEMORY.to),y
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iny
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dex
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bne md3
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54
screen.asm
54
screen.asm
@ -15,7 +15,9 @@
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}
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.macro cPrint() {
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sty MemMap.SCREEN.cTempY
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jsr Screen.printChar
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ldy MemMap.SCREEN.cTempY
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}
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.macro ClearScreen(screen, clearByte) {
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@ -94,13 +96,13 @@
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init: {
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lda #$00
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sta MemMap.SCREEN_SPACE.CursorCol
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sta MemMap.SCREEN_SPACE.CursorRow
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sta MemMap.SCREEN.CursorCol
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sta MemMap.SCREEN.CursorRow
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rts
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}
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printChar: {
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stx MemMap.SCREEN_SPACE.tempX
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stx MemMap.SCREEN.tempX
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// New Line
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cmp #$8e
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bne.r !+
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@ -110,47 +112,47 @@ printChar: {
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!:
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// Store Base Video Address 16 bit
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ldx #<constants.VIDEO_ADDR // Low byte
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stx MemMap.SCREEN_SPACE.TempVideoPointer
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stx MemMap.SCREEN.TempVideoPointer
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ldx #>constants.VIDEO_ADDR // High byte
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stx MemMap.SCREEN_SPACE.TempVideoPointer+1
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stx MemMap.SCREEN.TempVideoPointer+1
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// Temp Save Y
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sty MemMap.SCREEN_SPACE.tempY
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sty MemMap.SCREEN.tempY
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// CursorRow * 40
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ldy MemMap.SCREEN_SPACE.CursorRow
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sty MemMap.MATH_SPACE.factor1
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ldy MemMap.SCREEN.CursorRow
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sty MemMap.MATH.factor1
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ldy #constants.COLUMN_NUM
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sty MemMap.MATH_SPACE.factor2
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sty MemMap.MATH.factor2
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jsr Math.multiply
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// Add mul result to TempVideoPointer
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clc
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pha
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lda MemMap.MATH_SPACE.result
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adc MemMap.SCREEN_SPACE.TempVideoPointer+1
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sta MemMap.SCREEN_SPACE.TempVideoPointer+1
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lda MemMap.MATH_SPACE.result+1
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adc MemMap.SCREEN_SPACE.TempVideoPointer
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sta MemMap.SCREEN_SPACE.TempVideoPointer
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lda MemMap.MATH.result
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adc MemMap.SCREEN.TempVideoPointer+1
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sta MemMap.SCREEN.TempVideoPointer+1
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lda MemMap.MATH.result+1
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adc MemMap.SCREEN.TempVideoPointer
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sta MemMap.SCREEN.TempVideoPointer
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pla
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// Add column
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ldy MemMap.SCREEN_SPACE.CursorCol
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sta (MemMap.SCREEN_SPACE.TempVideoPointer), y
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ldy MemMap.SCREEN.CursorCol
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sta (MemMap.SCREEN.TempVideoPointer), y
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ldy MemMap.SCREEN_SPACE.tempY
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ldy MemMap.SCREEN.tempY
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iny
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inc MemMap.SCREEN_SPACE.CursorCol
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lda MemMap.SCREEN_SPACE.CursorCol
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inc MemMap.SCREEN.CursorCol
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lda MemMap.SCREEN.CursorCol
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cmp #constants.COLUMN_NUM+1
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bcc.r exita
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// CursorCol > COLUMN_NUM ? new line
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jsr screenNewLine
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exita:
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ldx MemMap.SCREEN_SPACE.tempX
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ldx MemMap.SCREEN.tempX
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rts
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}
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@ -167,10 +169,10 @@ exita:
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// ——————————————————————————————————————————————————————
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print: {
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ldy #$00
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sta MemMap.SCREEN_SPACE.TempStringPointer
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stx MemMap.SCREEN_SPACE.TempStringPointer+1
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sta MemMap.SCREEN.TempStringPointer
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stx MemMap.SCREEN.TempStringPointer+1
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printLoop:
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lda (MemMap.SCREEN_SPACE.TempStringPointer), y
|
||||
lda (MemMap.SCREEN.TempStringPointer), y
|
||||
cmp #0
|
||||
beq exit
|
||||
jsr Screen.printChar
|
||||
@ -181,8 +183,8 @@ print: {
|
||||
|
||||
screenNewLine: {
|
||||
lda #0
|
||||
sta MemMap.SCREEN_SPACE.CursorCol
|
||||
inc MemMap.SCREEN_SPACE.CursorRow
|
||||
sta MemMap.SCREEN.CursorCol
|
||||
inc MemMap.SCREEN.CursorRow
|
||||
rts
|
||||
}
|
||||
|
||||
|
||||
196
shell.asm
Normal file
196
shell.asm
Normal file
@ -0,0 +1,196 @@
|
||||
#importonce
|
||||
.filenamespace Shell
|
||||
|
||||
#import "mem_map.asm"
|
||||
#import "screen.asm"
|
||||
|
||||
* = * "Shell Routines"
|
||||
|
||||
.const CR = $0d
|
||||
|
||||
|
||||
init: {
|
||||
lda #-1
|
||||
sta MemMap.SHELL.pos
|
||||
rts
|
||||
}
|
||||
|
||||
push: {
|
||||
ldy MemMap.SHELL.pos
|
||||
iny
|
||||
cpy #127
|
||||
beq done
|
||||
sty MemMap.SHELL.pos
|
||||
sta MemMap.SHELL.buffer, y
|
||||
done:
|
||||
rts
|
||||
}
|
||||
|
||||
clear: {
|
||||
ldy #-1
|
||||
sty MemMap.SHELL.pos
|
||||
rts
|
||||
}
|
||||
|
||||
|
||||
// WOZ MONITOR FLOW - FROM APPLE1
|
||||
wozExec: {
|
||||
ldy #-1
|
||||
lda #0
|
||||
tax
|
||||
|
||||
SETSTOR:
|
||||
asl
|
||||
SETMODE: sta MemMap.SHELL.MODE
|
||||
|
||||
BLSKIP: iny
|
||||
|
||||
NEXTITEM:
|
||||
.break
|
||||
lda MemMap.SHELL.buffer,Y //Get character
|
||||
cmp #$0d
|
||||
bne CONT // We're done if it's CR!
|
||||
rts
|
||||
CONT:
|
||||
cmp #'.'
|
||||
bcc BLSKIP // Ignore everything below "."!
|
||||
beq SETMODE // Set BLOCK XAM mode ("." = $AE)
|
||||
cmp #':'
|
||||
beq SETSTOR // Set STOR mode! $BA will become $7B
|
||||
cmp #'R'
|
||||
beq RUN // Run the program! Forget the rest
|
||||
stx MemMap.SHELL.L // Clear input value (X=0)
|
||||
stx MemMap.SHELL.H
|
||||
sty MemMap.SHELL.YSAV // Save Y for comparison
|
||||
|
||||
// Here we're trying to parse a new hex value
|
||||
|
||||
NEXTHEX:
|
||||
lda MemMap.SHELL.buffer,y // Get character for hex test
|
||||
eor #$30 // Map digits to 0-9
|
||||
cmp #9+1 // Is it a decimal digit?
|
||||
bcc DIG // Yes!
|
||||
|
||||
// TODO: THIS IS NOT WORKING
|
||||
adc #$08 // Map letter "A"-"F" to $FA-FF
|
||||
cmp #$FA // Hex letter?
|
||||
bcc NOTHEX // No! Character not hex
|
||||
|
||||
DIG:
|
||||
asl
|
||||
asl // Hex digit to MSD of A
|
||||
asl
|
||||
asl
|
||||
|
||||
ldx #4 // Shift count
|
||||
HEXSHIFT: asl // Hex digit left, MSB to carry
|
||||
rol MemMap.SHELL.L // Rotate into LSD
|
||||
rol MemMap.SHELL.H // Rotate into MSD's
|
||||
dex // Done 4 shifts?
|
||||
bne HEXSHIFT // No, loop
|
||||
iny // Advance text index
|
||||
bne NEXTHEX // Always taken
|
||||
|
||||
NOTHEX: cpy MemMap.SHELL.YSAV //Was at least 1 hex digit given?
|
||||
bne !+ // No! Ignore all, start from scratch
|
||||
rts
|
||||
!:
|
||||
bit MemMap.SHELL.MODE //Test MODE byte
|
||||
bvc NOTSTOR // B6=0 is STOR, 1 is XAM or BLOCK XAM
|
||||
|
||||
// STOR mode, save LSD of new hex byte
|
||||
|
||||
lda MemMap.SHELL.L // LSD's of hex data
|
||||
sta (MemMap.SHELL.STL,X) //Store current 'store index'(X=0)
|
||||
inc MemMap.SHELL.STL //Increment store index.
|
||||
bne NEXTITEM // No carry!
|
||||
inc MemMap.SHELL.STH // Add carry to 'store index' high
|
||||
TONEXTITEM: jmp NEXTITEM //Get next command item.
|
||||
|
||||
//-------------------------------------------------------------------------
|
||||
// RUN user's program from last opened location
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
RUN: jmp (MemMap.SHELL.XAML) // Run user's program
|
||||
|
||||
//-------------------------------------------------------------------------
|
||||
// We're not in Store mode
|
||||
//-------------------------------------------------------------------------
|
||||
|
||||
NOTSTOR: bmi XAMNEXT // B7 = 0 for XAM, 1 for BLOCK XAM
|
||||
|
||||
// We're in XAM mode now
|
||||
|
||||
ldx #2 // Copy 2 bytes
|
||||
SETADR: lda MemMap.SHELL.L-1,X // Copy hex data to
|
||||
sta MemMap.SHELL.STL-1,X // 'store index'
|
||||
sta MemMap.SHELL.XAML-1,X // and to 'XAM index'
|
||||
dex // Next of 2 bytes
|
||||
bne SETADR // Loop unless X = 0
|
||||
|
||||
// Print address and data from this address, fall through next BNE.
|
||||
|
||||
NXTPRNT: bne PRDATA // NE means no address to print
|
||||
lda #$8e // Print CR first
|
||||
cPrint()
|
||||
lda MemMap.SHELL.XAMH // Output high-order byte of address
|
||||
jsr PRBYTE
|
||||
lda MemMap.SHELL.XAML // Output low-order byte of address
|
||||
jsr PRBYTE
|
||||
lda #':' // Print colon
|
||||
cPrint()
|
||||
|
||||
PRDATA: lda #' ' // Print space
|
||||
cPrint()
|
||||
lda (MemMap.SHELL.XAML,X) // Get data from address (X=0)
|
||||
jsr PRBYTE // Output it in hex format
|
||||
XAMNEXT: stx MemMap.SHELL.MODE // 0 -> MODE (XAM mode).
|
||||
lda MemMap.SHELL.XAML // See if there's more to print
|
||||
cmp MemMap.SHELL.L
|
||||
lda MemMap.SHELL.XAMH
|
||||
sbc MemMap.SHELL.H
|
||||
bcs TONEXTITEM // Not less! No more data to output
|
||||
|
||||
inc MemMap.SHELL.XAML // Increment 'examine index'
|
||||
bne MOD8CHK // No carry!
|
||||
inc MemMap.SHELL.XAMH
|
||||
|
||||
MOD8CHK: lda MemMap.SHELL.XAML // If address MOD 8 = 0 start new line
|
||||
and #%00000111
|
||||
bpl NXTPRNT // Always taken.
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Subroutine to print a byte in A in hex form (destructive)
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
PRBYTE: pha // Save A for LSD
|
||||
lsr
|
||||
lsr
|
||||
lsr // MSD to LSD position
|
||||
lsr
|
||||
jsr PRHEX // Output hex digit
|
||||
pla // Restore A
|
||||
|
||||
// Fall through to print hex routine
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// Subroutine to print a hexadecimal digit
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
PRHEX: and #%00001111 // Mask LSD for hex print
|
||||
ora #'0' // Add "0"
|
||||
cmp #'9'+1 // Is it a decimal digit?
|
||||
bcc ECHO // Yes! output it
|
||||
adc #6 // Add offset for letter A-F
|
||||
jsr Screen.petToScreen
|
||||
cPrint()
|
||||
rts
|
||||
done:
|
||||
.break
|
||||
rts
|
||||
|
||||
ECHO:
|
||||
cPrint()
|
||||
rts
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user