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remove more spaces :)
This commit is contained in:
Bob Andrews
GitHub
parent
9517553254
commit
fd128595c6
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@ -56,11 +56,11 @@ adp2:
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adp2_lo: .res 1
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adp2_hi: .res 1
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scroll_src:
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scroll_src:
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scroll_src_lo: .res 1
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scroll_src_hi: .res 1
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scroll_dest:
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scroll_dest:
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scroll_dest_lo: .res 1
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scroll_dest_hi: .res 1
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@ -75,9 +75,9 @@ _cursorY: .res 1
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tempchar: .res 1
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xval: .res 2 ; These could move to zeropage for perf, but presume we
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yval: .res 2 ; we want to minimize the amount we grow zero page use
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err: .res 2
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err: .res 2
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temp: .res 2
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tempa: .res 1
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tempa: .res 1
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tempx: .res 1
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tempy: .res 1
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temp2: .res 2
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@ -103,7 +103,7 @@ y0: .res 2
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; adp1 - address of pixel to set (16-bit)
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;-----------------------------------------------------------------------------------
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_GetPixelAddress:
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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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@ -165,7 +165,7 @@ msktb2: .byte $7F,$BF,$DF,$EF,$F7,$FB,$FD,$FE
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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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; 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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@ -173,25 +173,25 @@ msktb2: .byte $7F,$BF,$DF,$EF,$F7,$FB,$FD,$FE
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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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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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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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; 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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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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rts
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;-----------------------------------------------------------------------------------
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; ClearScreen - Clears the entire video memory (and thus the screen)
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@ -265,7 +265,7 @@ _ScrollScreen:
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lda (scroll_src),y ; I've unwound the loop to do 8 bytes at a time. Since we're doing full pages
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sta (scroll_dest),y ; as long as we unwind the loop to do 8 bytes at a time, we know we'll still
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iny ; do the final increment on a page boundary.
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lda (scroll_src),y
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lda (scroll_src),y
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sta (scroll_dest),y
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iny
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lda (scroll_src),y
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@ -303,7 +303,7 @@ fullPageLoop:
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sta (scroll_dest_lo),y
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iny
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bne fullPageLoop
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inc scroll_dest_hi
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inc scroll_dest_hi
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partialPageLoop:
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sta (scroll_dest_lo),y
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iny
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@ -368,8 +368,8 @@ _DrawCircle: lda _x1cord ; x0 = _x1cord
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sta yval
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sta yval+1
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sta err ; err = 0;
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sta err+1
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circleloop:
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sta err+1
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circleloop:
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lda xval+1 ; if (xval < yval) we're done;
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sec
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cmp yval+1
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@ -396,7 +396,7 @@ doCircle: lda x0 ; Draw the first of 8 symmetric
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sbc xval+1
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sta _y1cord+1
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jsr _SetPixel ; SETPIXEL(x0 + y, y0 - x, val);
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lda x0
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sec
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sbc yval
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@ -541,7 +541,7 @@ doCircle: lda x0 ; Draw the first of 8 symmetric
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asl temp ; temp = 2*(err-xval)+1
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rol temp+1
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inc temp
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inc temp
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bne :+
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inc temp+1
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:
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@ -631,7 +631,7 @@ ascToPetTable: .byte $00,$01,$02,$03,$04,$05,$06,$07,$14,$20,$0d,$11,$93,$0a,$0
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_AscToPet: tay
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lda ascToPetTable, y
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rts
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rts
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;-----------------------------------------------------------------------------------
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; ReverseBits - Reverse the bits in a byte
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@ -743,7 +743,7 @@ _DrawChar: sty tempy
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sta (dest, x)
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lda dest_lo ; Advance to the next "scanline", or pixel row, down
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clc
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adc #<BYTESPERROW
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adc #<BYTESPERROW
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sta dest_lo
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lda dest_hi
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adc #>BYTESPERROW
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@ -773,7 +773,7 @@ checkHWrap: lda _cursorX
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bcc checkVWrap
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lda #0
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sta _cursorX
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inc _cursorY
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inc _cursorY
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checkVWrap: lda _cursorY
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cmp #ROWSPERCOLUMN
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@ -803,7 +803,7 @@ loadChar: lda (adp1), y
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iny
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bne checkHWrap
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doneText: rts
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doneText: rts
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demoText1: .byte " *** COMMODORE KIM-1 SHELL V0.1 ***", $0A, $0A
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.byte " 60K RAM SYSTEM. 49152 BYTES FREE.", $0A, $0A
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