Apple-1-Tools/apple1emu-SAM
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- fixed BBR, where bits 0-6 were jumping to BBS

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- fixed resetting of key data on startup (1 byte out)
- improved Shift-Esc to poke RET into main loop
This commit is contained in:
Simon Owen 2008-07-20 12:52:56 +00:00
parent 2aa9957252
commit 400ebcf11b
1 changed files with 20 additions and 16 deletions
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36
apple1emu.asm
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@ -55,7 +55,7 @@ start: di
reset_loop: ld hl,0
ld (dsp_data),hl ; display ready
ld (kbd_ctrl),hl ; no key available
ld (kbd_data),hl ; no key available
ld hl,(m6502_reset) ; start from reset vector
ld (reg_pc),hl
@ -271,22 +271,26 @@ update_io:
in a,(status)
and %00100000
jr nz,not_esc ; jump if Esc not pressed
still_esc: ld a,&f7
in a,(status)
and %00100000
jr z,still_esc ; wait until Esc released
call clear_file ; Esc cancels type-in mode
ld a,&fe
in a,(keyboard)
rra
ld a,&1b ; Esc character
jr c,not_reset ; unshifted gives chr
ld a,&c9 ; RET opcode
ld (main_loop),a ; return to reset on next instruction
not_reset:
jr c,got_key ; unshifted gives chr
ld a,&c9 ; RET
ld (main_loop),a ; exit to reset at next instruction
jr no_key
still_esc: ld a,&f7
in a,(status)
and %00100000
jr z,still_esc ; wait until Esc released
ld a,&1b ; Esc character
jr got_key
not_esc:
ld a,&7f
in a,(keyboard)
@ -682,19 +686,19 @@ i_bra: ld a,(de) ; unconditional branch [65C02]
jr i_branch
i_bbr_0: ld a,%00000001 ; BBRn [65C02]
jp i_bbs
jp i_bbr
i_bbr_1: ld a,%00000010
jp i_bbs
jp i_bbr
i_bbr_2: ld a,%00000100
jp i_bbs
jp i_bbr
i_bbr_3: ld a,%00001000
jp i_bbs
jp i_bbr
i_bbr_4: ld a,%00010000
jp i_bbs
jp i_bbr
i_bbr_5: ld a,%00100000
jp i_bbs
jp i_bbr
i_bbr_6: ld a,%01000000
jp i_bbs
jp i_bbr
i_bbr_7: ld a,%10000000
i_bbr: ex de,hl
ld e,(hl)