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https://github.com/bobbimanners/Applecorn.git
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67 lines
3.3 KiB
Plaintext
67 lines
3.3 KiB
Plaintext
* Memory layout in main memory
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*
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* ; $0000-$00FF Zero page
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* ; $0100-$01FF Stack
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* ; $0200-$02FF ProDOS string buffers
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* ; $0200-$022F Overwritten by RTC routines
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* ; $0228-$023D
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DRVBUF1 EQU $023E ; $023E Drive
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DRVBUF2 EQU $023F ; $022F Prefix on current drive
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CMDPATH EQU $0280 ; $0280 Path used to start Applecorn
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*
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* ; $0300-$03CF File system core workspace
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* ; $0300-$0382 Filename string buffers
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MOSFILE1 EQU $0300 ; $0300 length
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* ; $0301 64 byte string
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MOSFILE2 EQU $0341 ; $0341 length
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* ; $0342 64 byte string
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* ; $0382-$03BD $3C spare bytes
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* ;
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* ; $03BE-$03CF: local copy of control block
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* ; $03BE FPTR FPTR
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* ; $03BF CHANNEL
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* ; $03C0 LOAD LOAD ADDR
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* ; $03C4 EXEC EXEC COUNT
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* ; $03C8 SIZE START OFFSET
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* ; $03CC ATTR END
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* ; $03D0-$03FF: ProDOS vectors, etc.
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* ; $03D0-$03D2 JMP WARM
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* ; $03D3-$03D5 JMP WARM
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* ; $03D6-$03EC ProDOS
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* ; $03ED-$03DE XFER address
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* ; $03EF ProDOS
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* ; $03F0-$03D1 BRKV
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* ; $03F2-$03D3 RESETV
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* ; $03F4 RESETV ACK
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* ; $03F5-$03F7 JMP AMP
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* ; $03F8-$03FA JMP USER
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* ; $03FB-$03FD JMP MON
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* ; $03FE-$03FF IRQV
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*
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* EQU $0400 ; $0400- Can't use as ProDOS uses 'hidden' bytes
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* ; -$07FF within screen for workspace
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SCREEN EQU $0800 ; $0800-$0BFF half 80-col screen or 40-col screen
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IOBUF0 EQU $0C00 ; $0C00-$0FFF For loading ROM, OSFILE, *.
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IOBUF1 EQU $1000 ; $1000-$13FF Four open files for langs
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IOBUF2 EQU $1400 ; $1400-$17FF
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IOBUF3 EQU $1800 ; $1800-$1BFF
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IOBUF4 EQU $1C00 ; $1C00-$1FFF
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* ; $2000- Code, to do: make code move itself
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* -$4FFF
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BLKBUF EQU $5000 ; $5000-$53FF 512-byte buffer plus channel data
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BLKBUFEND EQU $5200
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* To do later:
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* ; $2000-$3FFF Hi-Res screen 1
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* ; $4000-$5FFF Hi-Res screen 2
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* ; $6000- available
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* ; -$95FF available
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* ; $9600-$BDFF ProDOS buffers
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* ; $BE00-$BEFF MLI Global workspace
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* ; $BF00-$BFFF MLI API interface
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I think $0300-$03DF can be usefully used as filing system workspace,
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the mainmem copies of the filename and control block, MOSNAME and CBFILE,
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and later for OSGBPB.
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