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clean up bootloader and consolidate duplicate code

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This commit is contained in:
4am 2023-11-17 21:19:01 -05:00
parent 1778382119
commit d27658d23f
7 changed files with 280 additions and 99 deletions
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45
src/4cade.branding.a
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@ -3,41 +3,22 @@
;
PrintBranding
ldy #14
- lda II,y
ora #$80
+FORCE_UPPERCASE_IF_REQUIRED
sta $070C,y
; in: text screen is showing
; out: Y = 0 (important! some callers rely on this!)
ldy #15
- lda II-1, y
sta $070C-1, y
lda INSTANT-1, y
sta $04B4-1, y
lda REPLAY-1, y
sta $0534-1, y
dey
bpl -
ldy #12
- lda INSTANT,y
ora #$80
sta $04B5,y
dey
bpl -
ldy #10
- lda REPLAY,y
ora #$80
sta $0536,y
dey
bpl -
bne -
rts
II
!text "Total Replay II"
!scrxor $80,"TOTAL REPLAY II"
INSTANT
!text "I N S T A N T"
!scrxor $80," I N S T A N T "
REPLAY
!text "R E P L A Y"
!ifndef RELEASE {
LoadingVersion
!byte 9
!text " build 0"
LoadingBuild
!word BUILDNUMBER
} else {
LoadingVersion
!byte 12
!text "v1.0-alpha.3"
}
!scrxor $80," R E P L A Y "

39
src/4cade.init.a
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@ -7,28 +7,8 @@
; .SYSTEM file is loaded
;
+READ_ROM_NO_WRITE
sta PRIMARYCHARSET
sta CLR80VID
sta STOREOFF
sta READMAINMEM
sta WRITEMAINMEM
jsr ROM_TEXT
jsr ROM_HOME
jsr ROM_NORMAL
jsr ROM_IN0
jsr ROM_PR0
; accommodate uppercase-only machines (64K ][ and ][+ are supported)
lda ROM_MACHINEID
cmp #$A0
beq + ; Spectrum ED
cmp #$06
beq +
lda #$DF
+HIDE_NEXT_2_BYTES
+ lda #$FF
sta zpCharMask
!src "src/4cade.init.machine.a"
!src "src/4cade.init.screen.a"
; print text title in same place as graphical title will appear
jsr PrintBranding
@ -36,6 +16,9 @@
; proboothd duplicates the above code and jumps here,
; so if you make any changes before this comment, you
; MUST adjust the final JMP in src/proboothd/proboothd.a
!if (* != ProBootEntry) {
!serious "ProBootEntry is wrong, should be ", *
}
jsr Has64K ; check for 64K (required)
bcc +
@ -99,6 +82,17 @@
sta MONOCOLOR ; bit 7=1 disables color
+
; accommodate uppercase-only machines (64K ][ and ][+ are supported)
lda ROM_MACHINEID
cmp #$A0
beq + ; Spectrum ED
cmp #$06
beq +
lda #$DF
+HIDE_NEXT_2_BYTES
+ lda #$FF
sta zpCharMask
; increase text window width so we can print to the edge of the screen without scrolling
inc $21
; print version or build number in lower right corner
@ -288,6 +282,7 @@ FoundMockingboardCallback
jmp ROM_COUT
!src "src/4cade.branding.a"
!src "src/4cade.version.a"
Loading64K
!byte 3

15
src/4cade.init.machine.a Normal file
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@ -0,0 +1,15 @@
;license:MIT
;(c) 2023 by 4am
;
; initialize machine from a cold boot
; assumes absolutely nothing about machine state
;
; note: this file is included by both the launcher and proboothd
cld
+READ_ROM_NO_WRITE
sta PRIMARYCHARSET
sta CLR80VID
sta STOREOFF
sta READMAINMEM
sta WRITEMAINMEM

14
src/4cade.init.screen.a Normal file
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@ -0,0 +1,14 @@
;license:MIT
;(c) 2023 by 4am
;
; initialize and clear screen
; assumes zero page is completely trashed other than |zpCharMask|
; assumes ROM is banked in on entry
;
; note: this file is included by both the launcher and proboothd
jsr ROM_TEXT
jsr ROM_HOME
jsr ROM_NORMAL
jsr ROM_IN0
jsr ROM_PR0

15
src/4cade.version.a Normal file
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@ -0,0 +1,15 @@
;license:MIT
;(c) 2023 by 4am
;
!ifndef RELEASE {
LoadingVersion
!byte 9
!text " build 0"
LoadingBuild
!word BUILDNUMBER
} else {
LoadingVersion
!byte 12
!text "v1.0-alpha.3"
}

1
src/constants.a
View File

@ -161,6 +161,7 @@ gKey = $1F01
UILine1 = $1FB0
UILine2 = $1FD8
UI_ToPlay = $1FF7
ProBootEntry = $2025
gValLen = $1F80
gVal = $1F81

250
src/proboothd/proboothd.a
View File

@ -5,6 +5,8 @@
!to "build/proboothd",plain
*=$800
!src "src/macros.a"
;zpage usage, arbitrary selection except for the "ProDOS constant" ones
command = $42 ;ProDOS constant
unit = $43 ;ProDOS constant
@ -25,46 +27,20 @@
txa
pha
; put machine in a known state, clear screen
!src "src/4cade.init.machine.a"
cld
bit $c082
sta $c00e
sta $c00c
sta $c000
sta $c002
sta $c004
jsr $fb2f
jsr $fc58
jsr $fe84
jsr $fe89
jsr $fe93
lda KBD
cmp #$D3 ; 'S'
beq @s
cmp #$F3 ; 's'
bne +
@s
jsr seasons
+
!src "src/4cade.init.screen.a"
; print title
lda $fbb3
cmp #$A0
beq + ; Spectrum ED
cmp #$06
beq +
lda #$DF
!byte $2C
+ lda #$FF
sta $F1
ldy #15
- lda II-1,y
cmp #$E1
bcc +
and $F1
+ sta $070C-1,y
dey
bne -
ldy #13
- lda INSTANT-1,y
sta $04B5-1,y
lda REPLAY-1,y
sta $0535-1,y
dey
bne -
; print text title in same place as graphical title will appear
jsr PrintBranding
pla
sta unit
@ -164,7 +140,7 @@ blockind ldy $ff
txa
bne readfile
readdone jmp $2036
readdone jmp ProBootEntry
seekread stx bloklo
sty blokhi
@ -193,17 +169,201 @@ retcall pla
- rts
fakeMLI_e
; Interactive Seasons demo
; based on Apple II Seasons -=DESiRE=- 128B Demo for Outline 2020
; based on the code in Hellmood's 64B x86 demo 'Autumn'
; by deater (Vince Weaver)
; adapted by 4am for use within this bootloader
; /!\ While demo is running, press 1-4 to change color palettes
; or Esc to quit demo and continue the boot
HGR2 = $F3D8 ; Set full-screen hi-res mode using page 2 ($4000)
HPLOT0 = $F457 ; Plot point, (Y,X) = Horizontal, (A=Vertical)
HCOLOR = $F6EC ; Set color in X, must be 0..7
seasons:
bit $c010
jsr HGR2
ldx #(copy_seasons_e-copy_seasons)
- lda copy_seasons-1, x
sta $30, x
dex
bne -
jmp seasons_forever
copy_seasons:
; HGR ROM routines use
; $1C mask for color
; $26/$27 address for plot
; $30 color value * 17
; $E0/$E1 X coord of last hplot
; so code starts at $31 and must end before $E0
!pseudopc $31 {
EBP1 !byte 0
EBP2 !byte 0
EBP3 !byte 0
EBP4 !byte 0
color_lookup_lookup:
!byte <color_lookup
!byte <color_lookup2
!byte <color_lookup3
!byte <color_lookup4
color_lookup:
; qkumba ora2 white/blue/purple
!byte $02,$03,$02,$03, $06,$07,$06,$07
color_lookup2:
; better mixed orange/green/white
!byte $01,$03,$03,$03, $05,$05,$07,$07
color_lookup3:
; blue and purple palette
!byte $02,$02,$03,$06, $06,$06,$02,$07
color_lookup4:
; colorful palette
!byte $01,$01,$02,$03, $05,$05,$06,$07
seasons_forever:
; save old Xcoord value to X/Y for later
XCOORDL=*+1
ldx #0 ; 2
XCOORDH=*+1
ldy #0 ; 2
; 16-bit subtraction x=x-y
; need to set carry before subtraction on 6502
txa ; 1 (xcoordl in X)
sec ; 1
sbc <YCOORDL ; 2
sta <XCOORDL ; 2
tya ; 1 (xcoordh in Y)
YCOORDH=*+1
sbc #0 ; 2
; 16-bit arithmetic shift right of X
; 6502 has no asr instruction
; cmp #$80 sets carry if high bit set
cmp #$80 ; 2 ; XCOORDH still in A from before
ror ; 1
sta <XCOORDH ; 2
ror <XCOORDL ; 2
; 16-bit add, ycoord=ycoord+oldx
clc ; 1
txa ; 1
YCOORDL=*+1
adc #0 ; 2
sta <YCOORDL ; 2
tya ; 1
adc <YCOORDH ; 2
; 16-bit arithmetic shift right of y-coord
cmp #$80 ; 2 ; YCOORDH still in A from before
ror ; 1
sta <YCOORDH ; 2
ror <YCOORDL ; 2
; 32 bit rotate of low bit shifted out of Y-coordinate
ror <EBP1 ; 2
ror <EBP2 ; 2
ror <EBP3 ; 2
ror <EBP4 ; 2
; branch if carry set
bcs label_11f ; 2
; 16-bit increment of color
inc <COLORL ; 2
bne no_oflo ; 2
inc <COLORH ; 2
no_oflo:
; 16-bit add of X-coord by 0x80
; this keeps the drawing roughly to the 280x192 screen
; carry should still be clear (inc doesn't set it)
lda <XCOORDL ; 2
adc #$80 ; 2
sta <XCOORDL ; 2
bcc no_oflo2 ; 2
inc <XCOORDH ; 2
no_oflo2:
; 16-bit negate of Y-coord
sec ; 1
lda #0 ; 2
sbc <YCOORDL ; 2
sta <YCOORDL ; 2
lda #0 ; 2
sbc <YCOORDH ; 2
sta <YCOORDH ; 2
label_11f:
; 16-bit shift of color
; 2nd is a rotate as asl doesn't shift in carry
COLORL=*+1
lda #0 ; 2
asl ; 1 ; shl %ax
rol <COLORH ; 2
COLORH=*+1
eor #0 ; 2
sta <COLORL ; 2
; get color mapping
and #7 ; 2
tay ; 1
color_addr=*+1
ldx <color_lookup, y ; 2
; if ycoord negative, loop
lda <YCOORDH ; 2
bmi seasons_forever ; 2
; if top bits of xcoord, loop
lda <XCOORDH ; 2
and #$f0 ; 2
bne seasons_forever ; 2
put_pixel:
; actually set the color
jsr HCOLOR ; 3 ; color is in X
; set up parameters for HPLOT ROM call
ldx <XCOORDL ; 2 ; x coord in (y:x)
ldy <XCOORDH ; 2
lda <YCOORDL ; 2 ; y coord in A
jsr HPLOT0 ; 3
lda $c000
- bpl seasons_forever
cmp #$9b
beq +
and #3
tax
lda <color_lookup_lookup, x
sta <color_addr
bpl - ; always branches
+ rts
}
copy_seasons_e
filename
!byte filename_e - filename_b
filename_b
!text "LAUNCHER.SYSTEM" ;your start-up file, file is max 40kb
filename_e
II
!byte $D4,$EF,$F4,$E1,$EC,$A0,$D2,$E5,$F0,$EC,$E1,$F9,$A0,$C9,$C9
INSTANT
!byte $C9,$A0,$CE,$A0,$D3,$A0,$D4,$A0,$C1,$A0,$CE,$A0,$D4
REPLAY
!byte $A0,$D2,$A0,$C5,$A0,$D0,$A0,$CC,$A0,$C1,$A0,$D9,$A0
!src "src/4cade.branding.a"
!if (* > $9f7) {
!serious "Bootloader is too large"
}
*=$9f8
!byte $D3,$C1,$CE,$A0,$C9,$CE,$C3,$AE