mirror of
https://github.com/a2-4am/4live.git
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859 lines
21 KiB
Plaintext
859 lines
21 KiB
Plaintext
;
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; 4LIVE
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; Copyright (c) 2016 by 4am && qkumba
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; 100% open source, see LICENSE file
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;
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!cpu 6502
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!ct "lcase.ct"
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;user-defined
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HOTKEY = $80 ; CTRL-@
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IMPORTKEY = $89 ; CTRL-I
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CLEARKEY = $8E ; CTRL-N
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SAVEKEY = $93 ; CTRL-S
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;
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!addr KSWL = $38
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!addr KSWH = $39
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!addr FCBFOP = $40
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!addr GETIOB = $3E3
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!addr WARMDOS = $3D0
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!addr DOSBASE = $3D2
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!addr FILEMAN = $3D6
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!addr GETPARM = $3DC
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!addr KBD = $C000
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!addr STROBE = $C010
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!addr LCBANK2 = $C083
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!addr ROMIN1 = $C089
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!addr LCBANK1 = $C08B
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!addr APLDETECT = $FBB3 ;#06 if IIe or later
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!addr KEYIN = $FD1B
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!addr RDCHAR = $FD35
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!addr COUT = $FDED
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;private arbitrary addresses, shared with DOS to avoid conflict
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!addr OPSRC1L = $40
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!addr OPSRC1H = $41
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!addr OPDST1L = $42
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!addr OPDST1H = $43
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!addr OPSRC2L = $44
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!addr OPSRC2H = $45
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!addr OPDST2L = $46
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!addr OPDST2H = $47
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!addr SCROLLLINE = $48
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;constants
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A2E = $06
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INVSPACE = $20
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LTARROW = $88
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DNARROW = $8A
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UPARROW = $8B
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RETURN = $8D
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RTARROW = $95
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ESC = $9B
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DELETE = $FF
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IOBSLOT = 1
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IOBDRIVE = 2
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NAMELEN = 30
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CREATEFILE = 0
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OPENEXISTING = 1
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SPECIAL = 8
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CMDOPEN = 1
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CMDCLOSE = 2
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CMDREAD = 3
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READRANGE = 2
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POSREADRANGE = 4
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WIDTH = 40
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HEIGHT = 24
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LDRBASE = $2d9
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INSTALLBUFFER = $800 ; max 256 bytes, not preserved
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SWAPBUFFER = $900 ; (LoadSaveEnd - LoadSaveStart) size
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; needed by DiversiDOS, must be page-aligned
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; region is preserved across calls
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*=LDRBASE-4
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LdrHeader
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!word LDRBASE, LdrEnd - LdrStart
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;main loader routine loads discardable install code to $800,
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;since DOS startup will clobber this page anyway
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;also carries proxy routines including file manager and banked RAM exchange for DiversiDOS
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LdrStart
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;set filename pointer in MLI request packet
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lda FCBFOP
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sta FileName
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lda FCBFOP + 1
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sta FileName + 1
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;set slot and drive in MLI request packet
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jsr GETIOB
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pha ;save for later
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sty OPSRC1L
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sta OPSRC1H
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ldy #IOBDRIVE
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lda (OPSRC1L), y
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sta FileDrive
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dey ;ldy #IOBSLOT
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lda (OPSRC1L), y
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lsr
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lsr
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lsr
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lsr
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sta FileSlot
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dey ;ldy #00
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;open self and read first overlay
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jsr OpenMainFile
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jsr DOSMLI
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!byte LdrReadMLI_e - LdrReadMLI_b
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LdrReadMLI_b
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!byte CMDREAD
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!byte POSREADRANGE
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!word 0 ;record number
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!word LdrEnd - LdrHeader ;offset
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!word InstallEnd - InstallStart
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;number of bytes
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!word INSTALLBUFFER ;buffer
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LdrReadMLI_e
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;no need to close read-only files
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;DOS simply returns in that case
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;written files are the important ones
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;but we're not writing anything here
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jmp INSTALLBUFFER
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;set input name
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OpenDataFile
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ldy #(NAMELEN - 1)
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OpenMainFile
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lda FileName
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sta OPDST1L
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lda FileName + 1
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sta OPDST1H
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lda LCBANK2
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lda LCBANK2
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;set input name
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lda #$A0
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- cpy #(FileName_e - FileName_b)
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bcs +
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lda FileName_b, y
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+ sta (OPDST1L), y
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dey
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bpl -
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OpenFile
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jsr DOSMLI
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!byte OpenMLI_e - OpenMLI_b
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OpenMLI_b
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!byte CMDOPEN
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!byte 0 ;unused
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!word 0 ;variable records
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!byte 0 ;any volume
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FileDrive
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!text "Q" ;self-modified
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FileSlot
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!text "Q" ;self-modified
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!byte SPECIAL ;file type for when we save
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FileName
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!text "4s" ;self-modified
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OpenMLI_e
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rts
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FileName_b
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!text "_4LIVE DATA"
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FileName_e
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;first byte fetched is number of byte to follow,
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;copy parameters to file manager parameter list,
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;and then dispatch the request
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DOSMLI
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pla
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tay
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pla
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tax
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iny
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sty OPSRC1L
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bne +
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inx
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+ stx OPSRC1H
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;get file manager parameter list
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jsr GETPARM
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sty OPDST1L
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sta OPDST1H
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ldy #0
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lda (OPSRC1L), y
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tay
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clc
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adc OPSRC1L
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tax
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lda OPSRC1H
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adc #0
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pha
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txa
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pha
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- lda (OPSRC1L), y
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dey
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sta (OPDST1L), y
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bne -
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XREG
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ldx #OPENEXISTING
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SwapFILEMAN
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jmp FILEMAN ;self-modified from JMP to JSR
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BankInRAM1
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bit LCBANK1
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bit LCBANK1
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ReuseRts
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rts
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;support enhanced flashing cursor while waiting for key, if available.
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;it works by passing to the routine the character under the cursor.
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;the ROM toggles between that character and the Delete character.
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;on an Apple II+, the cursor is an inverse space in DOS mode.
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;our cursor flashes.
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GlobalKeyboardHook
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jsr KEYIN
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GetKey
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;are we on?
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cmp #HOTKEY
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;no -> return to DOS
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bne ReuseRts
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jsr BankInRAM1
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jsr RunFromBankedRAM
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lda ROMIN1
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;lather, rinse, repeat
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jsr RDCHAR ;returns non-zero
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bne GetKey
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ReadFile
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WriteFile
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jsr ExchangeSwapBanked1
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jsr DOSMLI
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!byte ReadMLI_e - ReadMLI_b
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ReadMLI_b
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ReadWriteCmd
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!byte CMDREAD
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!byte READRANGE
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!word 0 ;record number
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!word 0 ;offset
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ReadSize
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WriteSize
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!word (LoadSaveEnd - LoadSaveStart)
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;number of bytes
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ReadBuffer
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WriteBuffer
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!word LoadSaveStart ;buffer, self-modified in DiversiDOS
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ReadMLI_e
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;fall through to ExchangeBanked1
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;sorry, I couldn't find a simpler way...
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ExchangeSwapBanked1
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rts ;self-modified to LDA in DiversiDOS environment
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!byte (>LoadSaveStart) - >((<(LoadSaveEnd - LoadSaveStart)) + 255)
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sta OPDST1H
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ldx #>(LoadSaveEnd - LoadSaveStart)
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ldy #<(LoadSaveStart - LoadSaveEnd)
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lda #<(LoadSaveEnd - LoadSaveStart)
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sta OPSRC1L
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lda #<LoadSaveEnd
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ExchangeSwapSet
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sta OPDST1L
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lda #(>SWAPBUFFER) - >((<(LoadSaveEnd - LoadSaveStart)) + 255)
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sta OPSRC1H
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- lda (OPSRC1L), y
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pha
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lda (OPDST1L), y
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sta (OPSRC1L), y
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pla
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sta (OPDST1L), y
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iny
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bne -
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inc OPSRC1H
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inc OPDST1H
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dex
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bpl -
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rts
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LdrEnd
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!if ((LDRBASE + LdrEnd - LdrStart) > $3d0) {
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!error "swap code too large, ends at ",LDRBASE + LdrEnd - LdrStart
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}
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;install routine is an overlay that is loaded by loader routine above
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;loads editor code and data file into banked RAM either directly for DOS 3.3
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;or via RAM exchange for DiversiDOS
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InstallStart
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!pseudopc INSTALLBUFFER {
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;check for DiversiDOS
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pla
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eor #$BF
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bne + ;regular DOS
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sta ReadBuffer
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lda #>SWAPBUFFER
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sta ReadBuffer + 1
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sta InstallReadBuffer + 1
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lda #$A9 ;LDA
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sta ExchangeSwapBanked1
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sta ExchangeSwapBanked2
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+
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;enable reading directly into banked RAM
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jsr BankInRAM1
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;read second overlay to banked RAM
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jsr ReadEditor
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;open source file and read it if available
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jsr OpenDataFile
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bcs +
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jsr ReadFile
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+
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;set to true if no data file found (carry is set)
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rol ClearOnFirstKeypress + 1
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ldx SaveCH
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stx MyCH + 1
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ldy SaveCV
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sty MyCV + 1
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jsr MyBASCALC
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;switch to write mode for future accesses
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inc ReadWriteCmd ;lda WRITECMD / sta ReadWriteCmd
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dec XREG + 1 ;lda #CREATEFILE / sta XREG + 1
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lda ROMIN1
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;switch cursor type depending on Apple revision
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lda APLDETECT
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cmp #A2E
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beq +
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lda #INVSPACE
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sta CharDel + 1
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lda #("z" + 1)
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sta CharMap1 + 1
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sta CharMap2 + 1
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+
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;display the welcome message, now that we're finally done
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ldy #0
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beq ++
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CharMap1
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cmp #0 ;self-modified
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bcs +
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cmp #"a"
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bcc +
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and #$DF
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+ jsr COUT
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++ iny
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lda _WelcomeMessage-1,y
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bne CharMap1
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lda #<GlobalKeyboardHook
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sta KSWL
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lda #>GlobalKeyboardHook
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sta KSWH
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jmp WARMDOS
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ReadEditor
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jsr ExchangeSwapBanked2
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lda #$20
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sta SwapFILEMAN
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jsr DOSMLI
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!byte InstallReadMLI_e - InstallReadMLI_b
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InstallReadMLI_b
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!byte CMDREAD
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!byte POSREADRANGE
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!word 0 ;record number
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!word BankedCopyStart - LdrHeader
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;offset
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!word BankedCopyEnd - BankedCopyStart
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;number of bytes
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InstallReadBuffer
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!word $D000 ;buffer
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InstallReadMLI_e
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;fall through to ExchangeBanked2
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ExchangeSwapBanked2
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rts ;self-modified to LDA in DiversiDOS environment
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!byte ((>$D000) - >((<(BankedCopyEnd - BankedCopyStart)) + 255))
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sta OPDST1H
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ldx #>(BankedCopyEnd - BankedCopyStart)
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ldy #<(BankedCopyStart - BankedCopyEnd)
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lda #<(BankedCopyEnd - BankedCopyStart)
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sta OPSRC1L
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jmp ExchangeSwapSet
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_WelcomeMessage
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!text $8D, "4LIVE ready. Press Ctrl+", HOTKEY + $40, " to activate.", $8D, 0
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}
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InstallEnd
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!if >(InstallEnd - InstallStart) {
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!error "swap code too large, ends at ",INSTALLBUFFER + InstallEnd - InstallStart
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}
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;editor code is an overlay that is loaded by install routine above
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BankedCopyStart
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!pseudopc $D000 {
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RunFromBankedRAM
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;preserve X across calls
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;it's important for DOS
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txa
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pha
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;first, scroll the edit buffer onto the screen
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;(this also swaps the current screen contents out so we can restore it later)
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jsr ScrollEditBufferIn ;returns Y=FF
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;do the thing
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iny
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sty IsDirty + 1 ;0=false, non-0=true
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;do the thing
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jsr EditorMode
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;scroll the edit buffer out and the original screen back in
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jsr ScrollEditBufferOut
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;save to disk (if necessary)
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IsDirty
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lda #"Q" ;self-modified
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beq +
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;save to disk
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jsr SaveFile
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+ pla
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tax
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rts
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ScrollEditBufferIn
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ldy #(<(ScrollParms2 - ScrollParms1) - 1)
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jsr SetScrollLines
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;copy last line on screen to temporary buffer
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-- ldy #(WIDTH - 1)
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- lda $07D0, y
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sta (OPSRC1L), y
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dey
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bpl -
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;copy each line on screen down to next line (leaves top line untouched)
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jsr ScrollTextScreenDown
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;copy last line of edit buffer to top line on screen
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ldy #(WIDTH - 1)
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- lda (OPDST1L), y
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CharMap2
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cmp #0 ;self-modified
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bcs +
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cmp #"a"
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bcc +
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and #$DF
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+ sta $0400, y
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dey
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bpl -
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;animation delay
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jsr Delay
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lda #-WIDTH
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ldy #$FF
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jsr UpdateVirtualOff ;returns zr/nz state of SCROLLLINE
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bne --
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rts
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ScrollEditBufferOut
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ldy #((<(ScrollParms2 - ScrollParms1) * 2) - 1)
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jsr SetScrollLines
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;copy first line on screen to temporary buffer
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-- ldy #(WIDTH - 1)
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- lda $0400, y
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sta (OPSRC1L), y
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dey
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bpl -
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;copy each line on screen up to next line (leaves bottom line untouched)
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jsr ScrollTextScreenUp
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;copy first line of edit buffer to last line on screen
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ldy #(WIDTH - 1)
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- lda (OPDST1L), y
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sta $07D0, y
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dey
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bpl -
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;animation delay
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jsr Delay ;returns A=0
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tay
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lda #WIDTH
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jsr UpdateVirtualOff ;returns zr/nz state of SCROLLLINE
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bne --
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rts
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SetScrollLines
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ldx #3
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- lda ScrollParms1, y
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sta OPSRC1L, x
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dey
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dex
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bpl -
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lda #HEIGHT
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sta SCROLLLINE
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rts
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ScrollParms1
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!word LastLine, LastLine - WIDTH
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ScrollParms2
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!word FirstLine, FirstLine + WIDTH
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UpdateVirtualOff
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;set up copy addresses for next line
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ldx #2
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- pha
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clc
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adc OPSRC1L, x
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sta OPSRC1L, x
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tya
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adc OPSRC1H, x
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sta OPSRC1H, x
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pla
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dex
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dex
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bpl -
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dec SCROLLLINE
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rts
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ScrollTextScreenDown
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ldx #(HEIGHT - 2)
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- jsr SetTextCalc
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lda TextCalcLo+1, x
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sta OPDST2L
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lda TextCalcHi+1, x
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sta OPDST2H
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jsr CopyLine
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dex
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bpl -
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rts
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SetTextCalc
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lda TextCalcLo, x
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sta OPSRC2L
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lda TextCalcHi, x
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sta OPSRC2H
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rts
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ScrollTextScreenUp
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ldx #(1 - HEIGHT)
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- lda (TextCalcLo + HEIGHT - $101) +1, x
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sta OPSRC2L
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lda TextCalcLo + HEIGHT - $101, x
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sta OPDST2L
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lda (TextCalcHi + HEIGHT - $101) +1, x
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sta OPSRC2H
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lda TextCalcHi + HEIGHT - $101, x
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sta OPDST2H
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jsr CopyLine
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inx
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bne -
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rts
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CopyLine
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ldy #(WIDTH - 1)
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- lda (OPSRC2L), y
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sta (OPDST2L), y
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dey
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bpl -
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rts
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Delay
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lda #1
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MyWAIT
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sec
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-- pha
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- sbc #1
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bne -
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pla
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sbc #1
|
|
bne --
|
|
rts
|
|
|
|
ClearScreen ; does not clear status line
|
|
pha
|
|
clc
|
|
|
|
HandleKeyImportScreen ;called with carry set
|
|
lda #<(LastLine - WIDTH)
|
|
sta OPSRC1L
|
|
lda #>(LastLine - WIDTH)
|
|
sta OPSRC1H
|
|
|
|
ldx #(HEIGHT - 2)
|
|
-- jsr SetTextCalc
|
|
ldy #(WIDTH - 1)
|
|
lda #$A0
|
|
- bcc + ;ClearScreen path
|
|
lda (OPSRC1L), y
|
|
+ sta (OPSRC2L), y
|
|
dey
|
|
bpl -
|
|
bcc + ;ClearScreen path
|
|
sec
|
|
lda OPSRC1L
|
|
sbc #WIDTH
|
|
sta OPSRC1L
|
|
bcs +
|
|
dec OPSRC1H
|
|
sec
|
|
+ dex
|
|
bpl --
|
|
bcc ClearScreenRet ;ClearScreen path
|
|
|
|
;print anything that isn't a special key
|
|
;wrap around screen position when we hit edges
|
|
|
|
EditorMode
|
|
jsr MyKEYIN
|
|
cmp #HOTKEY
|
|
beq _doneEditorMode
|
|
cmp #ESC
|
|
beq _doneEditorMode
|
|
|
|
ClearOnFirstKeypress
|
|
ldx #0 ;self-modified
|
|
beq +
|
|
dec ClearOnFirstKeypress + 1
|
|
jsr ClearScreen
|
|
+
|
|
cmp #LTARROW
|
|
beq HandleKeyLineLeft
|
|
cmp #DNARROW
|
|
beq HandleKeyLineDown
|
|
cmp #UPARROW
|
|
beq HandleKeyLineUp
|
|
cmp #RTARROW
|
|
beq HandleKeyLineRight
|
|
cmp #RETURN
|
|
beq HandleKeyReturn
|
|
ldx #1
|
|
stx IsDirty + 1
|
|
cmp #IMPORTKEY
|
|
beq HandleKeyImportScreen
|
|
cmp #CLEARKEY
|
|
beq HandleKeyClearScreen
|
|
jsr MyCOUT
|
|
jmp EditorMode ;always
|
|
|
|
ClearScreenRet
|
|
pla
|
|
|
|
_doneEditorMode
|
|
rts
|
|
|
|
HandleKeyLineLeft
|
|
dec MyCH + 1
|
|
bpl EditorMode
|
|
lda #(WIDTH - 1)
|
|
|
|
SetColumn
|
|
sta MyCH + 1
|
|
bpl EditorMode ;always
|
|
|
|
HandleKeyLineRight
|
|
inc MyCH + 1
|
|
lda MyCH + 1
|
|
eor #WIDTH ;zero on match
|
|
bne EditorMode
|
|
beq SetColumn ;always
|
|
|
|
HandleKeyLineUp
|
|
ldy MyCV + 1
|
|
dey
|
|
bpl SetRow
|
|
ldy #(HEIGHT - 2)
|
|
|
|
SetRow
|
|
sty MyCV + 1
|
|
ldx MyCH + 1
|
|
jsr MyBASCALC ;returns flag=plus
|
|
bpl EditorMode ;always
|
|
|
|
HandleKeyClearScreen
|
|
jsr ClearScreen
|
|
dey ;-2
|
|
sty MyCV + 1 ;use big store to trigger wraparound
|
|
;fall through
|
|
|
|
HandleKeyReturn
|
|
lda #0
|
|
sta MyCH + 1
|
|
;fall through
|
|
|
|
HandleKeyLineDown
|
|
ldy MyCV + 1
|
|
iny
|
|
cpy #(HEIGHT - 1) ;zero on match
|
|
bcc SetRow ;not BNE to allow big store use
|
|
ldy #0
|
|
beq SetRow ;always
|
|
|
|
MyKEYIN
|
|
ldx MyCH + 1
|
|
|
|
ScreenBuff2
|
|
lda $34f3, x ;self-modified
|
|
sta ToggleChar + 1
|
|
|
|
CharDel
|
|
lda #DELETE
|
|
sec
|
|
!byte $24 ;mask CLC
|
|
ToggleCarry
|
|
clc
|
|
bcs +
|
|
|
|
ToggleChar
|
|
lda #"Q" ;self-modified
|
|
|
|
+ ldx MyCH + 1
|
|
|
|
ScreenBuff3
|
|
sta $34f3, x ;self-modified
|
|
|
|
;timing is taken from extended ROM
|
|
;code is optimised for size
|
|
|
|
ldx #$31
|
|
ldy #0
|
|
- lda KBD
|
|
bmi +
|
|
dey
|
|
bne -
|
|
dex
|
|
bne -
|
|
bcc CharDel
|
|
+ bcs ToggleCarry ;restore original character, also on exit
|
|
bit STROBE
|
|
rts
|
|
|
|
MyCOUT
|
|
MyCH
|
|
ldx #"Q" ;self-modified
|
|
|
|
ScreenBuff4
|
|
sta $34f3, x ;self-modified
|
|
inx
|
|
cpx #WIDTH
|
|
bne ++
|
|
ldx #0
|
|
MyCV
|
|
ldy #"Q" ;self-modified
|
|
iny
|
|
cpy #(HEIGHT - 1)
|
|
bne MyBASCALC
|
|
ldy #0
|
|
|
|
MyBASCALC
|
|
sty MyCV + 1
|
|
lda TextCalcLo, y
|
|
sta ScreenBuff2 + 1
|
|
sta ScreenBuff3 + 1
|
|
sta ScreenBuff4 + 1
|
|
lda TextCalcHi, y
|
|
sta ScreenBuff2 + 2
|
|
sta ScreenBuff3 + 2
|
|
sta ScreenBuff4 + 2
|
|
++ stx MyCH + 1
|
|
rts
|
|
|
|
SaveFile
|
|
lda MyCH + 1
|
|
sta SaveCH
|
|
lda MyCV + 1
|
|
sta SaveCV
|
|
|
|
CreateWriteFile
|
|
jsr OpenDataFile
|
|
bcs OpenRet
|
|
jsr WriteFile
|
|
jsr DOSMLI
|
|
!byte CloseMLI_e - CloseMLI_b
|
|
CloseMLI_b
|
|
!byte CMDCLOSE
|
|
CloseMLI_e
|
|
|
|
OpenRet
|
|
rts
|
|
|
|
TextCalcHi
|
|
!byte $04, $04, $05, $05, $06, $06, $07, $07
|
|
!byte $04, $04, $05, $05, $06, $06, $07, $07
|
|
!byte $04, $04, $05, $05, $06, $06, $07, $07
|
|
TextCalcLo
|
|
!byte $00, $80, $00, $80, $00, $80, $00, $80
|
|
!byte $28, $A8, $28, $A8, $28, $A8, $28, $A8
|
|
!byte $50, $D0, $50, $D0, $50, $D0, $50, $D0
|
|
|
|
LoadSaveStart
|
|
SaveCH
|
|
!byte 0 ;loaded from file if exists
|
|
SaveCV
|
|
!byte 0 ;loaded from file if exists
|
|
|
|
FirstLine ;lines are stored sequentially, not like text page in memory
|
|
!fill WIDTH * 8, $A0
|
|
!text " 4LIVE by 4am && qkumba "
|
|
!fill WIDTH, $A0
|
|
!text " Revision 02 / Serial number 161116 "
|
|
!fill WIDTH * 2, $A0
|
|
!text " https://github.com/a2-4am/4live "
|
|
!fill WIDTH * 9, $A0
|
|
|
|
LoadSaveEnd
|
|
;in the current version, the status line is not saved
|
|
;however, when we move to multi-screen support,
|
|
;both the status line and the spill line must be saved
|
|
;for scrolling to work properly
|
|
!fill (WIDTH - 5), $20
|
|
!text "4LIVE"
|
|
|
|
LastLine
|
|
!fill WIDTH, $A0
|
|
}
|
|
BankedCopyEnd
|