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Cleaned up +3 paging

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- Changed normal +3 paging value so ROM3 is always present
- Used binary for all paging values
- Cleaned up comments to make them more consistent
This commit is contained in:
Simon Owen
2011-12-05 00:12:43 +00:00
parent af6922f10d
commit b9b012e29e
1 changed files with 22 additions and 22 deletions
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44
pacemuzx.asm
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@ -98,7 +98,7 @@ dip_5080: defb %11001001 ; -dbbllcc d=hard/normal bb=bonus life
start2: di
ld a,(&5b5c) ; sysvar holding 128K paging
ex af,af' ; keep safe
ld a,%00000001 ; special paging mode (0/1/2/3)
ld a,%00000001 ; special paging, banks 0/1/2/3
ld bc,&1ffd ; +3 paging port
out (c),a ; attempt paging
ld a,(3) ; peek value in Pac-Man ROM
@ -106,10 +106,10 @@ start2: di
jr z,start3 ; if so, start up
ex af,af'
out (c),a ; restore 128K paging (if any)
call &0d6b ; CLS
ld a,2 ; main screen
call &1601 ; CHAN-OPEN
out (c),a ; restore 128K paging (disturbed due to partial address decoding)
ei
ld hl,fail_msg
@ -136,9 +136,9 @@ start3: ld sp,new_stack
call patch_rom ; patch the ROM while it's at the correct location
xor a ; +3 normal paging
ld a,%00000100 ; +3 normal paging
ld bc,&1ffd
out (c),a ; restore R/5/2/0, for ROM access at &c000
out (c),a ; restore R3/5/2/0, for ROM access at &c000
ld a,%10000011 ; DivIDE page 3
out (divide),a ; page in at &2000, if present
@ -245,7 +245,7 @@ wait_no_key: xor a
page_rom: push af
push bc
ld a,%00000001 ; special +2A/+3 paging, banks 0/1/2/3
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a
pop bc
@ -254,7 +254,7 @@ page_rom: push af
page_screen: push af
push bc
xor a ; normal paging, banks R/5/2/7
ld a,%00000100 ; +3 normal paging, R3/5/2/7
ld bc,&1ffd
out (c),a
pop bc
@ -538,7 +538,7 @@ pill_1: cp &9f
cp &10
jr nz,pill_clear_1
pill_1_on:
xor a ; normal paging, banks R/5/2/7
ld a,%00000100 ; +3 normal paging, R3/5/2/7
ld bc,&1ffd
out (c),a
@ -560,12 +560,12 @@ pill_1_on:
inc h
ld (hl),d
ld a,1
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a ; special paging (ROM)
out (c),a ; page ROM
ret
; clear pill
pill_clear_1: xor a ; normal paging, banks R/5/2/7
pill_clear_1: ld a,%00000100 ; +3 normal paging, R3/5/2/7
ld bc,&1ffd
out (c),a
@ -586,9 +586,9 @@ pill_clear_1: xor a ; normal paging, banks R/5/2/7
inc h
ld (hl),a
ld a,1
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a ; special paging (ROM)
out (c),a ; page ROM
ret
@ -654,9 +654,9 @@ pill_2: cp &10
dec l
inc h
ld a,1
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a ; special paging (ROM)
out (c),a ; page ROM
ret
; clear pill
@ -730,9 +730,9 @@ pill_clear_2: call page_screen
and e
ld (hl),a
ld a,1
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a ; special paging (ROM)
out (c),a ; page ROM
ret
@ -1175,7 +1175,7 @@ draw_tile_x: ld a,b
add hl,hl ; *4
add hl,bc ; *6
xor a ; normal paging, banks R/5/2/7
ld a,%00000100 ; +3 normal paging, R3/5/2/7
ld bc,&1ffd
out (c),a
@ -1297,9 +1297,9 @@ tile_2_lp: ld a,(de)
jr tile_exit
tile_exit:
ld a,1 ; special paging, banks 0/1/2/3
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a
out (c),a ; page ROM
exx
ret
@ -1507,7 +1507,7 @@ trim_edge:
or ixh ; offset to current screen
ld h,a
xor a
ld a,%00000100 ; +3 normal paging, R3/5/2/7
ld bc,&1ffd
out (c),a ; normal paging (screen)
@ -1531,9 +1531,9 @@ trim_line_lp: ld a,(hl)
call z,blockdown_hl
djnz trim_line_lp
ld a,1
ld a,%00000001 ; +3 special paging, banks 0/1/2/3
ld bc,&1ffd
out (c),a ; special paging (ROM)
out (c),a ; page ROM
ret