Apple-2-HW/Apple2-IO-RPi
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Merge branch 'main' of https://github.com/tjboldt/Apple2-IO-RPi into main

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This commit is contained in:
Terence Boldt 2020-12-10 04:58:58 +00:00
commit 5c4804b54c
2 changed files with 32 additions and 28 deletions
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2
Firmware/Driver.asm
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@ -140,6 +140,8 @@ finishWrite:
lda InputByte
asl
bpl finishWrite
lda #$FF
sta OutputByte
rts
GetByte:

58
Firmware/Driver.lst
View File

@ -1,4 +1,4 @@
ca65 V2.19 - Git 59c58acb
ca65 V2.18 - Ubuntu 2.18-1
Main file : Driver.asm
Current file: Driver.asm
@ -89,7 +89,7 @@ Current file: Driver.asm
001056 1 60 rts
001057 1
001057 1 read256:
001057 1 20 AB 10 jsr GetByte
001057 1 20 B0 10 jsr GetByte
00105A 1 91 44 sta (BufferLo),y
00105C 1 C8 iny
00105D 1 D0 F8 bne read256
@ -144,29 +144,31 @@ Current file: Driver.asm
0010A4 1 AD DE C0 lda InputByte
0010A7 1 0A asl
0010A8 1 10 FA bpl finishWrite
0010AA 1 60 rts
0010AB 1
0010AB 1 GetByte:
0010AB 1 20 BE 10 jsr GetNibble
0010AE 1 0A asl
0010AF 1 0A asl
0010B0 1 0A asl
0010B1 1 0A asl
0010B2 1 85 1D sta NibbleStorage
0010B4 1 20 BE 10 jsr GetNibble
0010B7 1 29 0F and #$0f
0010B9 1 05 1D ora NibbleStorage
0010BB 1 A5 1D lda NibbleStorage
0010BD 1 60 rts
0010BE 1
0010BE 1 GetNibble:
0010BE 1 A9 B0 lda #$b0 ;set read flag low
0010C0 1 8D DD C0 sta OutputByte
0010C3 1 waitRead:
0010C3 1 AD DE C0 lda InputByte
0010C6 1 30 FB bmi waitRead
0010C8 1 29 F0 and #$f0 ;set all flags high
0010CA 1 8D DD C0 sta OutputByte
0010CD 1 60 rts
0010CE 1
0010CE 1
0010AA 1 A9 FF lda #$FF
0010AC 1 8D DD C0 sta OutputByte
0010AF 1 60 rts
0010B0 1
0010B0 1 GetByte:
0010B0 1 20 C3 10 jsr GetNibble
0010B3 1 0A asl
0010B4 1 0A asl
0010B5 1 0A asl
0010B6 1 0A asl
0010B7 1 85 1D sta NibbleStorage
0010B9 1 20 C3 10 jsr GetNibble
0010BC 1 29 0F and #$0f
0010BE 1 05 1D ora NibbleStorage
0010C0 1 A5 1D lda NibbleStorage
0010C2 1 60 rts
0010C3 1
0010C3 1 GetNibble:
0010C3 1 A9 B0 lda #$b0 ;set read flag low
0010C5 1 8D DD C0 sta OutputByte
0010C8 1 waitRead:
0010C8 1 AD DE C0 lda InputByte
0010CB 1 30 FB bmi waitRead
0010CD 1 29 F0 and #$f0 ;set all flags high
0010CF 1 8D DD C0 sta OutputByte
0010D2 1 60 rts
0010D3 1
0010D3 1