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switch to overlay method

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loader, installer, editor are now modular within the same file;
$900-95FF preserved across reboot;
$800-BEFF available in DiversiDOS after load ($800-95FF for DOS 3.3)
This commit is contained in:
Peter Ferrie 2016-11-14 23:23:57 -08:00
parent 1f0514a2cb
commit fdb73d566e
1 changed files with 325 additions and 308 deletions
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633
src/4live.a
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@ -4,20 +4,29 @@
; 100% open source, see LICENSE file
;
!cpu 6502
*=$8000
!ct "lcase.ct"
;user-defined
HOTKEY = $80 ; CTRL-@
IMPORTKEY = $89 ; CTRL-I
CLEARKEY = $8E ; CTRL-N
SAVEKEY = $93 ; CTRL-S
INSTALLBUFFER = $800 ; max 256 bytes, not preserved
SWAPBUFFER = $900 ; (LoadSaveEnd - LoadSaveStart) size
; needed by DiversiDOS, must be page-aligned
; region is preserved across calls
;
!addr CH = $24
!addr BASL = $28
!addr KSWL = $38
!addr KSWH = $39
!addr FCBFOP = $40
!addr GETIOB = $3E3
!addr RECONNECTDOS = $3EA
!addr WARMDOS = $3D0
!addr DOSBASE = $3D2
!addr FILEMAN = $3D6
!addr GETPARM = $3DC
!addr RECONNECTDOS = $3EA
!addr KBD = $C000
!addr STROBE = $C010
!addr LCBANK2 = $C083
@ -28,27 +37,13 @@
!addr RDCHAR = $FD35
!addr COUT = $FDED
;private arbitrary addresses only during init
;no zpage use once started
!addr MANPARML = $40
!addr MANPARMH = $41
!addr DOSBUFL = $42
!addr DOSBUFH = $43
!addr OPSRCL = $44
!addr OPSRCH = $45
!addr OPDSTL = $46
!addr OPDSTH = $47
HOTKEY = $80 ; CTRL-@
IMPORTKEY = $89 ; CTRL-I
CLEARKEY = $8E ; CTRL-N
SAVEKEY = $93 ; CTRL-S
;private arbitrary addresses, currently shared with DOS to avoid conflict
!addr OPSRCL = $42
!addr OPSRCH = $43
!addr OPDSTL = $44
!addr OPDSTH = $45
;constants
SWAPCOPY = $368
SWAPBUFFER = $800 ; (LoadSaveEnd - LoadSaveStart) size
; currently $39A bytes!
; needed by DiversiDOS
A2E = $06
INVSPACE = $20
LTARROW = $88
@ -58,14 +53,9 @@
RTARROW = $95
ESC = $9B
DELETE = $FF
WIDTH = 40
HEIGHT = 24
IOBSLOT = 1
IOBDRIVE = 2
NEXTFILE = 36
PARMRANGE = 6
PARMFILE = 8
PARMWORK = 12
NAMELEN = 30
CREATEFILE = 0
OPENEXISTING = 1
@ -73,93 +63,90 @@
CMDOPEN = 1
CMDCLOSE = 2
CMDREAD = 3
CMDWRITE = 4
READRANGE = 2
POSREADRANGE = 4
WIDTH = 40
HEIGHT = 24
LDRBASE = $2ae
;
*=LDRBASE-4
LdrHeader
!word LDRBASE, LdrEnd - LdrStart
Install
;switch cursor type depending on Apple revision
;can't delay in case ROM is banked out because DiversiDOS
;main loader routine loads discardable install code to $800,
;since DOS startup will clobber this page anyway
;also carries proxy routines including file manager and banked RAM exchange for DiversiDOS
lda APLDETECT
cmp #A2E
beq +
lda #INVSPACE
sta CharDel + 1 + BankedCopyStart - $D000
lda #("z" + 1)
sta CharMap1 + 1
sta CharMap2 + 1 + BankedCopyStart - $D000
+
LdrStart
jsr GETIOB
sty OPSRCL
sta OPSRCH
;find a free DOS buffer
ldy #0
sty DOSBUFL
lda DOSBASE
;check for DiversiDOS
;remember if DiversiDOS
cmp #$BF
php
bne +
!if <SWAPBUFFER {
ldy #<SWAPBUFFER
}
sty ReadBuffer + BankedCopyStart - $D000
lda #>SWAPBUFFER
sta ReadBuffer + 1 + BankedCopyStart - $D000
lda #$A9
sta ExchangeSwapBanked + SWAPCOPYStart - SWAPCOPY
lda LCBANK2
lda LCBANK2
lda #$DD
+
;set slot and drive in MLI request packet
;back to regular DOS
+ sta DOSBUFH
!byte $2C ;mask LDY
- ldy #NEXTFILE
lda (DOSBUFL), y
tax
iny
lda (DOSBUFL), y
stx DOSBUFL
sta DOSBUFH
ldy #IOBDRIVE
lda (OPSRCL), y
sta FileDrive
dey ;ldy #IOBSLOT
lda (OPSRCL), y
lsr
lsr
lsr
lsr
sta FileSlot
;set filename pointer in MLI request packet
stx FileName + BankedCopyStart - $D000
sta FileName + 1 + BankedCopyStart - $D000
lda FCBFOP
sta FileName
lda FCBFOP + 1
sta FileName + 1
;check for empty filename (indicates free buffer)
;restore input name
ldy #0
lda (DOSBUFL), y
bne -
lda #"_"
dey ;ldy #00
sta (FCBFOP), y
;get file manager parameter list
;open self and read first overlay
jsr GETPARM
sty MANPARML
sta MANPARMH
sty MANPARM + 1 + BankedCopyStart - $D000
sta MANPARM + 2 + BankedCopyStart - $D000
jsr OpenFile
jsr DOSMLI
!byte LdrReadMLI_e - LdrReadMLI_b
LdrReadMLI_b
!byte CMDREAD
!byte POSREADRANGE
!word 0 ;record number
!word LdrEnd - LdrHeader ;offset
!word InstallEnd - InstallStart
;number of bytes
!word INSTALLBUFFER ;buffer
LdrReadMLI_e
;copy DOS buffer pointers to file manager parameter list
;no need to close read-only files
;DOS simply returns in that case
;written files are the important ones
;but we're not writing anything here
lda #NAMELEN
jmp INSTALLBUFFER
;set input name
OpenDataFile
lda LCBANK2
lda LCBANK2
lda FileName
sta OPDSTL
lda #PARMWORK
lda FileName + 1
sta OPDSTH
ldx #(6 - 1)
- ldy OPDSTL
lda (DOSBUFL), y
ldy OPDSTH
sta (MANPARML), y
inc OPDSTL
inc OPDSTH
dex
bpl -
;set input name
@ -168,113 +155,81 @@ Install
- cpy #(FileName_e - FileName_b)
bcs +
lda FileName_b, y
+ sta (DOSBUFL), y
+ sta (OPDSTL), y
dey
bpl -
;open source file and read it if available
OpenFile
jsr DOSMLI
!byte OpenMLI_e - OpenMLI_b
OpenMLI_b
!byte CMDOPEN
!byte 0 ;unused
!word 0 ;variable records
!byte 0 ;any volume
FileDrive
!text "Q" ;self-modified
FileSlot
!text "Q" ;self-modified
!byte SPECIAL ;file type for when we save
FileName
!text "4s" ;self-modified
OpenMLI_e
jsr GETIOB
sty OPSRCL
sta OPSRCH
ldy #IOBSLOT
lda (OPSRCL), y
lsr
lsr
lsr
lsr
sta FileSlot + BankedCopyStart - $D000
iny ;ldy #IOBDRIVE
lda (OPSRCL), y
sta FileDrive + BankedCopyStart - $D000
;copy to swap space
ldy #(SWAPCOPYEnd - SWAPCOPYStart)
- lda SWAPCOPYStart - 1, y
sta SWAPCOPY - 1, y
dey
bne -
;copy to banked RAM
jsr BankInRAM1
ldx #>(BankedCopyEnd + 255 - BankedCopyStart)
CopyMod
- lda BankedCopyStart, y
sta $D000, y
iny
bne -
inc CopyMod + 2
inc CopyMod + 5
dex
bne -
inx ;ldx #OPENEXISTING
jsr OpenFile
bcs +
;;in the future, the read size will come from the saved file
;;for now, we use a fixed size
;read file size from file
;; jsr ReadFile
;; lda #<LoadSaveStart
;; sta ReadBuffer
;; lda #>LoadSaveStart
;; sta ReadBuffer + 1
jsr ReadFile
jsr CloseFile
+
;set to true if no data file found (carry is set)
rol ClearOnFirstKeypress + 1
ldx SaveCH
stx MyCH + 1
ldy SaveCV
sty MyCV + 1
jsr MyBASCALC
;switch to write mode for future accesses
inc ReadWriteCmd ;lda WRITECMD / sta ReadWriteCmd
lda ROMIN1
;display the welcome message, now that we're finally done
ldy #0
beq ++
CharMap1
cmp #0 ;self-modified
bcs +
cmp #"a"
bcc +
and #$DF
+ jsr COUT
++ iny
lda _WelcomeMessage-1,y
bne CharMap1
lda #<GlobalKeyboardHook
sta KSWL
lda #>GlobalKeyboardHook
sta KSWH
jsr RECONNECTDOS
jmp WARMDOS
_WelcomeMessage
!text $8D, "4Live ready. Press Ctrl-", HOTKEY + $40, " to activate.", $8D, 0
rts
FileName_b
!text "_4LIVE DATA"
FileName_e
SWAPCOPYStart
!pseudopc SWAPCOPY {
;first byte fetched is number of byte to follow,
;copy parameters to file manager parameter list,
;and then dispatch the request
DOSMLI
pla
tay
pla
tax
iny
sty OPSRCL
bne +
inx
+ stx OPSRCH
;get file manager parameter list
jsr GETPARM
sty OPDSTL
sta OPDSTH
ldy #0
lda (OPSRCL), y
tay
clc
adc OPSRCL
tax
lda OPSRCH
adc #0
pha
txa
pha
- lda (OPSRCL), y
dey
sta (OPDSTL), y
bne -
XREG
ldx #OPENEXISTING
SwapFILEMAN
jmp FILEMAN ;self-modified from JMP to JSR
BankInRAM1
bit LCBANK1
bit LCBANK1
ReuseRts
rts
;support enhanced flashing cursor while waiting for key, if available.
;it works by passing to the routine the character under the cursor.
;the ROM toggles between that character and the Delete character.
@ -299,34 +254,53 @@ GetKey
jsr RDCHAR
jmp GetKey
SwapFILEMAN
jsr FILEMAN
ReadFile
WriteFile
jsr ExchangeSwapBanked1
jsr DOSMLI
!byte ReadMLI_e - ReadMLI_b
ReadMLI_b
ReadWriteCmd
!byte CMDREAD
!byte READRANGE
!word 0 ;record number
!word 0 ;offset
BankInRAM1
bit LCBANK1
bit LCBANK1
ReuseRts
rts
;;in the future, ReadSize will be initially 2
;;and ReadBuffer will point to ReadSize
;;so that the initial file size will be read into the Size field
;;for subsequent read of remaining bytes
ReadSize
WriteSize
!word (LoadSaveEnd - LoadSaveStart)
;number of bytes
ReadBuffer
WriteBuffer
!word LoadSaveStart ;buffer, self-modified in DiversiDOS
ReadMLI_e
;fall through to ExchangeBanked1
;sorry, I couldn't find a simpler way...
ExchangeSwapBanked
ExchangeSwapBanked1
rts ;self-modified to LDA in DiversiDOS environment
!byte <(SWAPBUFFER + LoadSaveEnd - LoadSaveStart)
sta ExchangeSwapSource1 + 1
sta ExchangeSwapTarget1 + 1
lda #((>SWAPBUFFER) - >((<(LoadSaveEnd - LoadSaveStart)) + 255))
sta ExchangeSwapSource1 + 2
sta ExchangeSwapTarget1 + 2
lda #<(LoadSaveStart + LoadSaveEnd - LoadSaveStart)
sta ExchangeSwapSource2 + 1
sta ExchangeSwapTarget2 + 1
lda #((>LoadSaveStart) - >((<(LoadSaveEnd - LoadSaveStart)) + 255))
!byte >(LoadSaveStart - >((<(LoadSaveEnd - LoadSaveStart)) + 255))
sta ExchangeSwapSource2 + 2
sta ExchangeSwapTarget2 + 2
ldx #>(LoadSaveEnd - LoadSaveStart)
ldy #<(LoadSaveStart - LoadSaveEnd)
lda #<(LoadSaveEnd - LoadSaveStart)
sta ExchangeSwapSource1 + 1
sta ExchangeSwapTarget1 + 1
lda #<LoadSaveEnd
ExchangeSwapSet
sta ExchangeSwapSource2 + 1
sta ExchangeSwapTarget2 + 1
lda #((>SWAPBUFFER) - >((<(LoadSaveEnd - LoadSaveStart)) + 255))
sta ExchangeSwapSource1 + 2
sta ExchangeSwapTarget1 + 2
ExchangeSwapSource1
lda $34f3, y ;self-modified
pha
@ -346,11 +320,141 @@ ExchangeSwapTarget2
dex
bpl ExchangeSwapSource1
rts
LdrEnd
!if ((LDRBASE + LdrEnd - LdrStart) > $3d0) {
!error "swap code too large, ends at ",LDRBASE + LdrEnd - LdrStart
}
SWAPCOPYEnd
!if ((SWAPCOPYEnd + SWAPCOPY - SWAPCOPYStart) > $3d0) {
!error "swap code too large, ends at ",SWAPCOPYEnd + SWAPCOPY - SWAPCOPYStart
;install routine is an overlay that is loaded by loader routine above
;loads editor code and data file into banked RAM either directly for DOS 3.3
;or via RAM exchange for DiversiDOS
InstallStart
!pseudopc INSTALLBUFFER {
;switch cursor type depending on Apple revision
ldx #$20 ;also used as INVSPACE cursor below!
stx SwapFILEMAN
lda APLDETECT
cmp #A2E
beq +
stx CharDel + 1 + BankedCopyStart - $D000
lda #("z" + 1)
sta CharMap1 + 1
sta CharMap2 + 1 + BankedCopyStart - $D000
+
plp ;DiversiDOS state
bcc + ;regular DOS
lda #0
sta ReadBuffer
lda #>SWAPBUFFER
sta ReadBuffer + 1
sta InstallReadBuffer + 1
lda #$A9 ;LDA
sta ExchangeSwapBanked1
sta ExchangeSwapBanked2
+
;enable reading directly into banked RAM
jsr BankInRAM1
;read second overlay to banked RAM
jsr ExchangeSwapBanked2
jsr DOSMLI
!byte InstallReadMLI_e - InstallReadMLI_b
InstallReadMLI_b
!byte CMDREAD
!byte POSREADRANGE
!word 0 ;record number
!word BankedCopyStart - LdrHeader
;offset
!word BankedCopyEnd - BankedCopyStart
;number of bytes
InstallReadBuffer
!word $D000 ;buffer
InstallReadMLI_e
jsr ExchangeSwapBanked2
;open source file and read it if available
jsr OpenDataFile
bcs +
;;in the future, the read size will come from the saved file
;;for now, we use a fixed size
;read file size from file
;; jsr ReadFile
;; lda #<LoadSaveStart
;; sta ReadBuffer
;; lda #>LoadSaveStart
;; sta ReadBuffer + 1
jsr ReadFile
+
;set to true if no data file found (carry is set)
rol ClearOnFirstKeypress + 1
ldx SaveCH
stx MyCH + 1
ldy SaveCV
sty MyCV + 1
jsr MyBASCALC
;switch to write mode for future accesses
inc ReadWriteCmd ;lda WRITECMD / sta ReadWriteCmd
dec XREG + 1 ;lda #CREATEFILE / sta XREG + 1
lda ROMIN1
;display the welcome message, now that we're finally done
ldy #0
beq ++
CharMap1
cmp #0 ;self-modified
bcs +
cmp #"a"
bcc +
and #$DF
+ jsr COUT
++ iny
lda _WelcomeMessage-1,y
bne CharMap1
lda #<GlobalKeyboardHook
sta KSWL
lda #>GlobalKeyboardHook
sta KSWH
jsr RECONNECTDOS
jmp WARMDOS
ExchangeSwapBanked2
rts ;self-modified to LDA in DiversiDOS environment
!byte ((>$D000) - >((<(BankedCopyEnd - BankedCopyStart)) + 255))
sta ExchangeSwapSource2 + 2
sta ExchangeSwapTarget2 + 2
ldx #>(BankedCopyEnd - BankedCopyStart)
ldy #<(BankedCopyStart - BankedCopyEnd)
lda #<(BankedCopyEnd - BankedCopyStart)
sta ExchangeSwapSource1 + 1
sta ExchangeSwapTarget1 + 1
jmp ExchangeSwapSet
_WelcomeMessage
!text $8D, "4Live ready. Press Ctrl-", HOTKEY + $40, " to activate.", $8D, 0
}
InstallEnd
!if >(InstallEnd - InstallStart) {
!error "swap code too large, ends at ",INSTALLBUFFER + InstallEnd - InstallStart
}
;editor code is an overlay that is loaded by install routine above
BankedCopyStart
!pseudopc $D000 {
@ -363,10 +467,10 @@ RunFromBankedRAM
;first, scroll the edit buffer onto the screen
;(this also swaps the current screen contents out so we can restore it later)
jsr ScrollEditBufferIn ;returns X=0
jsr ScrollEditBufferIn ;returns X=0
;do the thing
stx IsDirty + 1 ;0=false, non-0=true
stx IsDirty + 1 ;0=false, non-0=true
;do the thing
jsr EditorMode
@ -376,7 +480,7 @@ RunFromBankedRAM
;save to disk (if necessary)
IsDirty
lda #"Q" ;self-modified
lda #"Q" ;self-modified
beq +
;save to disk
@ -756,25 +860,6 @@ MyBASCALC
++ stx MyCH + 1
rts
OpenFile
jsr DOSMLI
!byte OpenMLI_e - OpenMLI_b
OpenMLI_b
!byte CMDOPEN
!byte 0 ;unused
!word 0 ;variable records
!byte 0 ;any volume
FileDrive
!text "Q" ;self-modified
FileSlot
!text "Q" ;self-modified
!byte SPECIAL ;file type for when we save
FileName
!text "4s" ;self-modified
OpenMLI_e
OpenRet
rts
SaveFile
lda MyCH + 1
sta SaveCH
@ -782,8 +867,7 @@ SaveFile
sta SaveCV
CreateWriteFile
ldx #CREATEFILE
jsr OpenFile
jsr OpenDataFile
bcs OpenRet
;set write length
@ -793,82 +877,15 @@ CreateWriteFile
;; lda #>something
;; sta WriteSize + 1
jsr WriteFile
CloseFile
jsr DOSMLI
!byte CloseMLI_e - CloseMLI_b
CloseMLI_b
!byte CMDCLOSE
CloseMLI_e
OpenRet
rts
WriteFile
jsr ExchangeSwapBanked
ReadFile
jsr DOSMLI
!byte ReadMLI_e - ReadMLI_b
ReadMLI_b
ReadWriteCmd
!byte CMDREAD
!byte READRANGE
!word 0 ;record number
!word 0 ;offset
;;in the future, ReadSize will be initially 2
;;and ReadBuffer will point to ReadSize
;;so that the initial file size will be read into the Size field
;;for subsequent read of remaining bytes
ReadSize
WriteSize
!word (LoadSaveEnd - LoadSaveStart)
;number of bytes
ReadBuffer
WriteBuffer
!word LoadSaveStart ;buffer, self-modified in DiversiDOS
ReadMLI_e
jmp ExchangeSwapBanked
;first byte fetched is number of byte to follow,
;copy parameters to file manager parameter list,
;and then dispatch the request
DOSMLI
stx XREG + 1
pla
tay
pla
tax
iny
sty OPSRC1 + 1
sty OPSRC2 + 1
bne +
inx
+ stx OPSRC1 + 2
stx OPSRC2 + 2
ldy #0
OPSRC1
lda $34f3, y ;self-modified
tay
clc
adc OPSRC1 + 1
tax
lda OPSRC1 + 2
adc #0
pha
txa
pha
OPSRC2
- lda $34f3, y ;self-modified
dey
MANPARM
sta $34f3, y ;self-modified
bne -
XREG
ldx #"Q" ;self-modified
jmp SwapFILEMAN
TextCalcHi
!byte $04, $04, $05, $05, $06, $06, $07, $07
!byte $04, $04, $05, $05, $06, $06, $07, $07
@ -892,7 +909,7 @@ FirstLine ;lines are stored sequentially, not like
!fill WIDTH * 8, $A0
!text " 4LIVE by 4am && qkumba "
!fill WIDTH, $A0
!text " Revision 02 / Serial number 161110 "
!text " Revision 02 / Serial number 161114 "
!fill WIDTH * 2, $A0
!text " https://github.com/a2-4am/4live "
!fill WIDTH * 9, $A0