Added support for LOAD & SAVE commands via Apple-1 Serial Interface
This commit is contained in:
flowenol
parent
6a1e34ba6f
commit
a1e942851f
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@ -0,0 +1,2 @@
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*.bin
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*.o
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9
Makefile
9
Makefile
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@ -1,7 +1,7 @@
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AFLAGS =
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LFLAGS = -C replica1.cfg
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AFLAGS =
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LFLAGS = -C apple1cartridge.cfg
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BINFILE = applesoft-lite.bin
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OBJS = applesoft-lite.o io.o cffa1.o wozmon.o
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OBJS = applesoft-lite.o io.o apple1serial.o
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$(BINFILE): $(OBJS)
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ld65 $(LFLAGS) $(OBJS) -o $(BINFILE)
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@ -12,7 +12,7 @@ applesoft-lite.o: applesoft-lite.s
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wozmon.o: wozmon.s
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ca65 $(AFLAGS) $<
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cffa1.o: cffa1.s
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apple1serial.o: apple1serial.s
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ca65 $(AFLAGS) $<
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io.o: io.s
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@ -20,4 +20,3 @@ io.o: io.s
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clean:
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rm $(OBJS) $(BINFILE)
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12
README.md
12
README.md
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@ -3,3 +3,15 @@
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This is a stripped-down version of Applesoft BASIC (Microsoft 6502 BASIC) for the Apple-1.
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See https://cowgod.org/replica1/applesoft/
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# apple1serial
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This branch has been modified to perform LOAD and SAVE operations via Apple-1 Serial interface
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https://github.com/flowenol/apple1serial
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# How to use LOAD?
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The LOAD command implemented on this branch takes as an argument the length of the program
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as a decimal value, e.g.,
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]LOAD 1024
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@ -0,0 +1,7 @@
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MEMORY {
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BASROM: start = $6000, size = $2000, fill = yes, file = %O;
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}
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SEGMENTS {
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BASIC: load = BASROM, type = ro;
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}
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@ -0,0 +1,233 @@
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.setcpu "6502"
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.segment "BASIC"
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.include "zeropage.s"
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.importzp ERR_SYNTAX, ERR_NOSERIAL
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.import ERROR, FIX_LINKS, OUTDO
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.export SerialLoad, SerialSave, SerialMenu
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SERIAL_MONITOR := $C100
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SERIAL_READY := $C000
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SERIAL_ID := $C0FC
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SERIAL_API_READ := $C1EC
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SERIAL_API_WRITE := $C213
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; ZP locations get backed up here
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ZPTemp := $0380
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;End address of dump block
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END_ADDR_L := $34
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END_ADDR_H := $35
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;Begin address of dump block
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BEG_ADDR_L := $36
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BEG_ADDR_H := $37
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;String to int ZP variables
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STR2INT_BUF := $38
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STR2INT_INT := $3E
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STR2INT_END := $0A
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; ----------------------------------------------------------------------------
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; See if Apple-1 Serial Interface card is present and display error if not
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; ----------------------------------------------------------------------------
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CheckSerial:
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ldy SERIAL_ID
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cpy #'A'
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bne SerialErr
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ldy SERIAL_ID + 1
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cpy #'1'
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bne SerialErr
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ldy SERIAL_ID + 2
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cpy #'S'
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bne SerialErr
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ldy SERIAL_ID + 3
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cpy #'I'
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bne SerialErr
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rts
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SerialErr:
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ldx #ERR_NOSERIAL
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.byte $2C ; Bogus BIT instruction
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SynErr:
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ldx #ERR_SYNTAX
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jmp ERROR ; Jump to Applesoft ERROR routine
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; ----------------------------------------------------------------------------
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; Bring up the Apple-1 Serial Interface menu
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; ----------------------------------------------------------------------------
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SerialMenu:
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jsr CheckSerial
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jsr SERIAL_MONITOR
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; ----------------------------------------------------------------------------
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; Save program via the Apple-1 Serial Interface
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; ----------------------------------------------------------------------------
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SerialSave:
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jsr CheckSerial
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ldy #0
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@1:
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lda END_ADDR_L,y ; Back up 4 affected bytes of the ZP
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sta ZPTemp,y
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iny
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cpy #4
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bne @1
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lda PRGEND ; Set up end address
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sta END_ADDR_L
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lda PRGEND+1
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sta END_ADDR_H
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lda TXTTAB ; Set up start address
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sta BEG_ADDR_L
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lda TXTTAB+1
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sta BEG_ADDR_H
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jsr SERIAL_API_WRITE
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jsr RestoreZPForSave ; Put the zero page back
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rts
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; ----------------------------------------------------------------------------
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; Restores the 4 bytes of the ZP which were saved during SerialSave
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; ----------------------------------------------------------------------------
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RestoreZPForSave:
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ldy #0
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@1:
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lda ZPTemp,y ; Load byte from temporary storage
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sta END_ADDR_L,y ; put it back in its original location
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iny
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cpy #4 ; Repeat for next 11 bytes
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bne @1
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rts
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; ----------------------------------------------------------------------------
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; Read program from Apple-1 Serial Interface
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; ----------------------------------------------------------------------------
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SerialLoad:
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jsr CheckSerial
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ldy #0
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@1:
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lda END_ADDR_L,y ; Back up first 12 bytes of the ZP
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sta ZPTemp,y
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iny
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cpy #12
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bne @1
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GetLength: ; Get file name from input line
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dec TXTPTR
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ldy #0
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@1:
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jsr CHRGET ; Get next character from the input line
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beq @2 ; Is it null (EOL)?
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cmp #$30
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bmi LengthValidationErr
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cmp #$3A
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bpl LengthValidationErr
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and #$0F ; Convert ASCII to hex value $00-$09
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sta STR2INT_BUF,y ; Not EOL, store it in program length string
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iny
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cpy #5 ; 6 chars yet?
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bne @1 ; no
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@2:
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cpy #0 ; Read 6 chars or EOL, did we get anything?
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beq SynErr
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lda #STR2INT_END ; append integer string end marker
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sta STR2INT_BUF,y
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jsr String2Int
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lda STR2INT_INT
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bne @3
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dec STR2INT_INT+1
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@3:
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dec STR2INT_INT
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clc
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SetLoadAddresses:
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lda TXTTAB ; Compute program end address
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adc STR2INT_INT ; (Add file size to program start)
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sta VARTAB ; Store end address
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sta END_ADDR_L
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lda TXTTAB+1
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adc STR2INT_INT+1
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sta VARTAB+1
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sta END_ADDR_H
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;jsr SerialAPISetup
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lda TXTTAB ; Set up start address
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sta BEG_ADDR_L
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lda TXTTAB+1
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sta BEG_ADDR_H
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jsr SERIAL_API_READ
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jsr RestoreZPForLoad ; Put the zero page back
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jmp FIX_LINKS
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LengthValidationErr:
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jsr RestoreZPForLoad
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jmp SynErr
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; ----------------------------------------------------------------------------
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; Restores the affected 12 bytes of the ZP which were saved during SerialLoad
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; ----------------------------------------------------------------------------
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RestoreZPForLoad:
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ldy #0
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@1:
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lda ZPTemp,y ; Load byte from temporary storage
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sta END_ADDR_L,y ; put it back in its original location
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iny
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cpy #12 ; Repeat for next 11 bytes
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bne @1
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rts
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; ----------------------------------------------------------------------------
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; Converts the integer string to 2 byte integer
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; ----------------------------------------------------------------------------
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String2Int:
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lda #0
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sta STR2INT_INT+1
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lda STR2INT_BUF
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sta STR2INT_INT
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ldx #1
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lda STR2INT_BUF,X
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cmp #STR2INT_END
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bne String2IntNext
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clc
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rts
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String2IntNext:
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jsr String2IntMult10
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bcs String2IntEnd
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inx
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lda STR2INT_BUF,X
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cmp #$0A
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bne String2IntNext
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clc
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String2IntEnd:
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rts
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String2IntMult10:
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lda STR2INT_INT+1
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pha
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lda STR2INT_INT
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asl STR2INT_INT
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rol STR2INT_INT+1
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asl STR2INT_INT
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rol STR2INT_INT+1
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adc STR2INT_INT
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sta STR2INT_INT
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pla
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adc STR2INT_INT+1
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sta STR2INT_INT+1
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asl STR2INT_INT
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rol STR2INT_INT+1
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lda STR2INT_BUF,X
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adc STR2INT_INT
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sta STR2INT_INT
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lda #0
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adc STR2INT_INT+1
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sta STR2INT_INT+1
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rts
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@ -1,4 +1,4 @@
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; Applesoft Lite
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; Applesoft Lite
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;
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; Disassembled from the Apple II+ ROMs with da65 V2.12.0
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;
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@ -8,20 +8,20 @@
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; Adapted for the Replica-1 by Tom Greene
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; 7-May-2008
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;
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; v0.4
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; Changed to support LOAD & SAVE via Apple-1 Serial Interface by Piotr Jaczewski
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; 15-Jan-2021
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;
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.setcpu "6502"
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.segment "BASIC"
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.export FIX_LINKS, ERROR, INPUTBUFFER
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.exportzp ERR_SYNTAX, ERR_NOCFFA
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.exportzp ERR_SYNTAX, ERR_NOSERIAL
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.import CLS, OUTDO, CRDO, OUTSP, OUTQUES ; Imports from io.s
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.import KEYBOARD, GETLN, RDKEY
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.import CFFALoad, CFFASave, CFFAMenu ; Imports from cffa1.s
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.import SerialLoad, SerialSave, SerialMenu ; Imports from apple1serial.s
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.include "macros.s"
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.include "zeropage.s"
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@ -95,9 +95,9 @@ TOKEN_ADDRESS_TABLE:
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.addr CLEAR - 1 ; $9B... 154... CLEAR
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.addr GET - 1 ; $9C... 155... GET
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.addr NEW - 1 ; $9D... 156... NEW
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.addr CFFAMenu - 1 ; $9E... 157... MENU
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.addr CFFASave - 1 ; $9F... 158... SAVE
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.addr CFFALoad - 1 ; $A0... 160... LOAD
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.addr SerialMenu - 1 ; $9E... 157... MENU
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.addr SerialSave - 1 ; $9F... 158... SAVE
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.addr SerialLoad - 1 ; $A0... 160... LOAD
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.addr CLS - 1 ; $A1... 161... CLS
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; ----------------------------------------------------------------------------
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UNFNC: .addr SGN ; $B1... 177... SGN
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@ -189,9 +189,9 @@ TOKEN_NAME_TABLE:
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htasc "CLEAR" ; $9B... 155
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htasc "GET" ; $9C... 156
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htasc "NEW" ; $9D... 157
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htasc "MENU" ; $9E... 158 New tokens
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htasc "MENU" ; $9E... 158 New tokens
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htasc "SAVE" ; $9F... 159 for
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htasc "LOAD" ; $A0... 160 CFFA I/O
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htasc "LOAD" ; $A0... 160 Apple-1 Serial I/O
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htasc "CLS" ; $A1... 161 New token to clear screen
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htasc "TO" ; $A2... 162
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htasc "SPC(" ; $A3... 163
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@ -281,8 +281,8 @@ ERR_FRMCPX := <(*-ERROR_MESSAGES)
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ERR_CANTCONT := <(*-ERROR_MESSAGES)
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htasc "CAN'T CONT"
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ERR_NOCFFA := <(*-ERROR_MESSAGES) ; New error message for CFFA1 I/O
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htasc "NO CFFA"
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ERR_NOSERIAL := <(*-ERROR_MESSAGES) ; New error message for Apple 1 Serial IO
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htasc "NO SERIAL"
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; ----------------------------------------------------------------------------
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QT_ERROR:
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.byte " ERR"
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@ -415,7 +415,7 @@ REASON: cpy FRETOP+1 ; HIGH BYTE
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dex
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bpl @2
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jsr GARBAG ; MAKE AS MUCH ROOM AS POSSIBLE
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ldx #TEMP1-FAC+1 ; RESTORE TEMP1 AND TEMP2
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ldx #TEMP1-FAC+1+256 ; RESTORE TEMP1 AND TEMP2
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@3: pla ; AND (Y,A)
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sta FAC,x
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inx
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@ -638,7 +638,7 @@ INLIN2: stx PROMPT
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; dex
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; bne @2
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;@3: lda #0 ; (Y,X) POINTS AT BUFFER-1
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ldx #<INPUTBUFFER-1
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ldx #<INPUTBUFFER-1+256
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ldy #>INPUTBUFFER-1
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rts
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@ -751,7 +751,7 @@ PARSE: inx ; NEXT INPUT CHARACTER
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; ---END OF LINE------------------
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@17: sta INPUTBUFFER-3,y ; STORE ANOTHER 00 ON END
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dec TXTPTR+1 ; SET TXTPTR = INPUTBUFFER-1
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lda #<INPUTBUFFER-1
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lda #<INPUTBUFFER-1+256
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sta TXTPTR
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rts
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@ -941,7 +941,7 @@ LIST4: bpl LIST2 ; BRANCH IF NOT A TOKEN
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sty FAC ; POINT FAC TO TABLE
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ldy #>(TOKEN_NAME_TABLE-$100)
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sty FAC+1
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ldy #-1
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ldy #$FF
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@1: dex ; SKIP KEYWORDS UNTIL REACH THIS ONE
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beq @3
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@2: jsr GETCHR ; BUMP Y, GET CHAR FROM TABLE
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@ -2961,7 +2961,7 @@ STR: jsr CHKNUM ; EXPRESSION MUST BE NUMERIC
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jsr FOUT1 ; CONVERT FAC TO STRING
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pla ; POP RETURN OFF STACK
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pla
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lda #<STACK-1 ; POINT TO STACK-1
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lda #<STACK-1+256 ; POINT TO STACK-1
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ldy #>STACK-1 ; (WHICH=0)
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beq STRLIT ; ...ALWAYS, CREATE DESC & MOVE STRING
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@ -4258,7 +4258,7 @@ FDIVT: beq @8 ; FAC = 0, DIVIDE BY ZERO ERROR
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jsr ADD_EXPONENTS
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inc FAC
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beq JOV ; OVERFLOW
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ldx #-4 ; INDEX FOR RESULT
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ldx #252 ; INDEX FOR RESULT
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lda #1 ; SENTINEL
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@1: ldy ARG+1 ; SEE IF FAC CAN BE SUBTRACTED
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cpy FAC+1
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@ -4850,7 +4850,7 @@ FOUT1: lda #'-' ; IN CASE VALUE NEGATIVE
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@3: lda #<CON_BILLION ; MULTIPLY BY 1E9
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ldy #>CON_BILLION ; TO GIVE ADJUSTMENT A HEAD START
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jsr FMULT
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lda #-9 ; EXPONENT ADJUSTMENT
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lda #247 ; EXPONENT ADJUSTMENT
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@4: sta TMPEXP ; 0 OR -9
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; ----------------------------------------------------------------------------
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; ADJUST UNTIL 1E8 <= (FAC) <1E9
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@ -5061,7 +5061,7 @@ FPWRT: beq EXP ; IF FAC=0, ARG^FAC=EXP(0)
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tya ; MAKE ARG SIGN + AS IT IS MOVED TO FAC
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ldy CHARAC ; INTEGRAL, SO ALLOW NEGATIVE ARG
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@2: jsr MFA ; MOVE ARGUMENT TO FAC
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tya ; SAVE FLAG FOR NEGATIVE ARG (0=+)
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tya ; SAVE FLAG FOR NEGATIVE ARG (0=+)
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pha
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jsr LOG ; GET LOG(ARG)
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lda #TEMP3 ; MULTIPLY BY POWER
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@ -5256,7 +5256,7 @@ RND: jsr SIGN ; REDUCE ARGUMENT TO -1, 0, OR +1
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; GENERIC COPY OF CHRGET SUBROUTINE, WHICH
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; IS COPIED INTO $00B1...$00C8 DURING INITIALIZATION
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;
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; CORNELIS BONGERS DESCRIBED SEVERAL IMPROVEMENTS
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; CORNELIS BONGERS DESCRIBED SEVERAL IMPROVEMENTS
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; TO CHRGET IN MICRO MAGAZINE OR CALL A.P.P.L.E.
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; (I DON'T REMEMBER WHICH OR EXACTLY WHEN)
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; ----------------------------------------------------------------------------
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@ -5272,7 +5272,7 @@ GENERIC_CHRGET:
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sec ; TEST FOR NUMERIC RANGE IN WAY THAT
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sbc #'0' ; CLEARS CARRY IF CHAR IS DIGIT
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sec ; AND LEAVES CHAR IN A-REG
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sbc #-'0'
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sbc #-'0'+256
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@2: rts
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@ -5305,7 +5305,7 @@ COLDSTART:
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; ----------------------------------------------------------------------------
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; MOVE GENERIC CHRGET AND RANDOM SEED INTO PLACE
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;
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; NOTE THAT LOOP VALUE IS WRONG!
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; NOTE THAT LOOP VALUE IS WRONG!
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; THE LAST BYTE OF THE RANDOM SEED IS NOT
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; COPIED INTO PAGE ZERO!
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; ----------------------------------------------------------------------------
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@ -5498,4 +5498,3 @@ RESUME: lda ERRLIN ; RESTORE LINE # AND TXTPTR
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ldx ERRSTK ; RETRIEVE STACK PNTR AS IT WAS
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txs ; BEFORE STATEMENT SCANNED
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jmp NEWSTT ; DO STATEMENT AGAIN
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|
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185
cffa1.s
185
cffa1.s
|
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@ -1,185 +0,0 @@
|
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; CFFA1 I/O routines for Applesoft Lite
|
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; by Tom Greene
|
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; 8-May-2008
|
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|
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.setcpu "6502"
|
||||
.segment "BASIC"
|
||||
|
||||
.include "zeropage.s"
|
||||
|
||||
.importzp ERR_SYNTAX, ERR_NOCFFA
|
||||
.import ERROR, FIX_LINKS
|
||||
.export CFFALoad, CFFASave, CFFAMenu
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; CFFA1 firmware addresses
|
||||
|
||||
;CFFA_ID1 := $AFFC ; CFFA1 API documentation says AFFC and AFFD...
|
||||
;CFFA_ID2 := $AFFD
|
||||
CFFA_ID1 := $AFDC ; But the CFFA1 firmware says AFDC and AFDD...
|
||||
CFFA_ID2 := $AFDD
|
||||
CFFA_MENU := $9006 ; Entry point for the CFFA1 menu
|
||||
CFFA_API := $900C ; Entry point for the CFFA1 API
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; CFFA1 API functions
|
||||
|
||||
CFFA1_DisplayError = $04 ; Displays error message for error value in A
|
||||
CFFA1_WriteFile = $20
|
||||
CFFA1_ReadFile = $22
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; CFFA1 API parameters in the ZP
|
||||
|
||||
Destination := $00 ; File load/save address
|
||||
Filename := $02 ; Pointer to file name
|
||||
Filetype := $06 ; ProDOS file type
|
||||
AuxType := $07 ; ProDOS file auxtype
|
||||
FileSize := $09 ; File size
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Scratch memory used during API calls
|
||||
|
||||
ZPTemp := $0380 ; ZP locations get backed up here
|
||||
CFFAFileName := $03C0 ; File name string
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; ProDOS file type value for write operations
|
||||
; The CFFA1 doesn't really care, so this is just for show.
|
||||
|
||||
SaveType = $F8 ; F8 = "PRG"?
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; See if CFFA1 card is present and display error if not
|
||||
; ----------------------------------------------------------------------------
|
||||
CheckCFFA:
|
||||
ldy CFFA_ID1
|
||||
cpy #$CF
|
||||
bne CFFAErr
|
||||
ldy CFFA_ID2
|
||||
cpy #$FA
|
||||
bne CFFAErr
|
||||
rts
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Bring up the CFFA1 menu
|
||||
; ----------------------------------------------------------------------------
|
||||
CFFAMenu:
|
||||
jsr CheckCFFA
|
||||
jmp CFFA_MENU
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; This sets up the zero page locations file name for the read/write calls
|
||||
; ----------------------------------------------------------------------------
|
||||
APISetup:
|
||||
jsr CheckCFFA ; Make sure CFFA card is present first
|
||||
ldy #0
|
||||
@1: lda GOWARM,y ; Back up first 12 bytes of the ZP
|
||||
sta ZPTemp,y ; so they can used during CFFA API call
|
||||
iny
|
||||
cpy #12
|
||||
bne @1
|
||||
GetFileName: ; Get file name from input line
|
||||
dec TXTPTR
|
||||
ldy #0
|
||||
@1: jsr CHRGET ; Get next character from the input line
|
||||
beq @2 ; Is it null (EOL)?
|
||||
sta CFFAFileName+1,y ; Not EOL, store it in filename string
|
||||
iny
|
||||
cpy #15 ; 15 chars yet?
|
||||
bne @1 ; no, go back for more
|
||||
@2: cpy #0 ; Read 15 chars or EOL, did we get anything?
|
||||
beq SynErr ; No, syntax error
|
||||
sty CFFAFileName ; Store file name length
|
||||
lda #<CFFAFileName ; Load address of file name string
|
||||
ldy #>CFFAFileName
|
||||
sta Filename ; and store it for API call
|
||||
sty Filename+1
|
||||
lda PRGEND ; Set up file size
|
||||
sbc TXTTAB ; (PRGEND - TXTTAB)
|
||||
sta FileSize
|
||||
lda PRGEND+1
|
||||
sbc TXTTAB+1
|
||||
sta FileSize+1
|
||||
lda TXTTAB ; Set up start address and auxtype
|
||||
ldy TXTTAB+1 ; (these will be the same)
|
||||
sta Destination
|
||||
sta AuxType
|
||||
sty Destination+1
|
||||
sty AuxType+1
|
||||
lda #SaveType ; Set up ProDOS file type
|
||||
sta Filetype
|
||||
rts
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Display an error message if something went wrong during APISetup
|
||||
; Uses the Applesoft ERROR routine
|
||||
; ----------------------------------------------------------------------------
|
||||
CFFAErr:
|
||||
ldx #ERR_NOCFFA
|
||||
.byte $2C ; Bogus BIT instruction
|
||||
SynErr:
|
||||
ldx #ERR_SYNTAX
|
||||
jmp ERROR ; Jump to Applesoft ERROR routine
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Restores the first 12 bytes of the ZP which were saved during APISetup
|
||||
; ----------------------------------------------------------------------------
|
||||
RestoreZP:
|
||||
ldy #0
|
||||
@1: lda ZPTemp,y ; Load byte from temporary storage
|
||||
sta GOWARM,y ; put it back in its original location
|
||||
iny
|
||||
cpy #12 ; Repeat for next 11 bytes
|
||||
bne @1
|
||||
rts
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Write a file to the CFFA card (SAVE command)
|
||||
; ----------------------------------------------------------------------------
|
||||
CFFASave:
|
||||
jsr APISetup ; Set up zero page locations for API call
|
||||
ldx #CFFA1_WriteFile; Select WriteFile API function
|
||||
jsr DoCFFACall ; Do it
|
||||
@1: jsr RestoreZP ; put ZP back together
|
||||
@2: rts
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Read file from CFFA, then fix up Applesoft zero page to point to the
|
||||
; loaded program (LOAD command)
|
||||
; ----------------------------------------------------------------------------
|
||||
CFFALoad:
|
||||
jsr APISetup
|
||||
ldx #CFFA1_ReadFile ; Select ReadFile API function
|
||||
jsr DoCFFACall ; Do it
|
||||
lda TXTTAB ; Compute program end address
|
||||
adc FileSize ; (Add file size to program start)
|
||||
sta VARTAB ; Store end address
|
||||
lda TXTTAB+1
|
||||
adc FileSize+1
|
||||
sta VARTAB+1
|
||||
jsr RestoreZP ; Put the zero page back
|
||||
jmp FIX_LINKS ; Done loading, fix pointers and restart
|
||||
|
||||
|
||||
; ----------------------------------------------------------------------------
|
||||
; Call the CFFA1 API and display error message if one occurred
|
||||
; CFFA function number is passed in X
|
||||
; CFFA API returns error status in C, error number in A
|
||||
; ----------------------------------------------------------------------------
|
||||
DoCFFACall:
|
||||
jsr CFFA_API ; Call CFFA API
|
||||
ldx #CFFA1_DisplayError ; Set next command to show error message
|
||||
bcs DoCFFACall ; Call API again if error occurred
|
||||
rts
|
||||
|
||||
|
||||
10
replica1.cfg
10
replica1.cfg
|
|
@ -1,10 +0,0 @@
|
|||
MEMORY {
|
||||
BASROM: start = $E000, size = $1F00, fill = yes, file = %O;
|
||||
MONROM: start = $FF00, size = $100, fill = yes, file = %O;
|
||||
}
|
||||
|
||||
SEGMENTS {
|
||||
BASIC: load = BASROM, type = ro;
|
||||
MONITOR: load = MONROM, type = ro;
|
||||
}
|
||||
|
||||
183
wozmon.s
183
wozmon.s
|
|
@ -1,183 +0,0 @@
|
|||
; Apple I Monitor ROM
|
||||
; Steve Wozniak
|
||||
; 1976
|
||||
; --------------------------------------------------------
|
||||
|
||||
.setcpu "6502"
|
||||
.segment "MONITOR"
|
||||
|
||||
.export ECHO
|
||||
|
||||
; --------------------------------------------------------
|
||||
; Zero page variables
|
||||
XAML := $24
|
||||
XAMH := $25
|
||||
STL := $26
|
||||
STH := $27
|
||||
L := $28
|
||||
H := $29
|
||||
YSAV := $2A
|
||||
MODE := $2B
|
||||
|
||||
; I/O locations
|
||||
IN := $0200 ; Input buffer is $0200 to $027F
|
||||
KBD := $D010 ; Keyboard data
|
||||
DSP := $D012 ; Display data
|
||||
KBDCR := $D011 ; Keyboard control register
|
||||
DSPCR := $D013 ; Display control register
|
||||
|
||||
; ASCII codes
|
||||
CR = $0D | $80 ; Carriage return
|
||||
ESC = $1B | $80 ; Escape
|
||||
SLASH = '\' | $80 ; \
|
||||
UNDERSC = '_' | $80 ; Underscore (acts as backspace)
|
||||
DOT = '.' | $80 ; .
|
||||
COLON = ':' | $80 ; :
|
||||
R = 'R' | $80 ; "R"
|
||||
SPACE = ' ' | $80 ; blank
|
||||
ZERO = '0' | $80 ; "0"
|
||||
|
||||
; --------------------------------------------------------
|
||||
RESET: cld ; Clear decimal arithmetic mode
|
||||
cli
|
||||
ldy #$7F ; Mask for DSP data direction register
|
||||
sty DSP ; Set it up
|
||||
lda #$A7 ; KBD and DSP control register mask
|
||||
sta KBDCR ; Enable interrupts, set CA1, CB1 for
|
||||
sta DSPCR ; positive edge sense/output mode
|
||||
NOTCR: cmp #UNDERSC ; Backspace?
|
||||
beq BACKSPACE ; Yes
|
||||
cmp #ESC ; ESC?
|
||||
beq ESCAPE ; Yes
|
||||
iny ; Advance text index
|
||||
bpl NEXTCHAR ; Auto ESC if > 127
|
||||
ESCAPE: lda #SLASH ; "\"
|
||||
jsr ECHO ; Output it
|
||||
GETLINE:
|
||||
lda #CR ; CR
|
||||
jsr ECHO ; Output it
|
||||
ldy #$01 ; Initialize text index
|
||||
BACKSPACE:
|
||||
dey ; Back up text index
|
||||
bmi GETLINE ; Beyond start of line, reinitialize
|
||||
NEXTCHAR:
|
||||
lda KBDCR ; Key ready?
|
||||
bpl NEXTCHAR ; Loop until ready
|
||||
lda KBD ; Load character. B7 should be '1'
|
||||
sta IN,y ; Add to text buffer
|
||||
jsr ECHO ; Display character
|
||||
cmp #CR ; CR?
|
||||
bne NOTCR ; No
|
||||
ldy #$FF ; Reset text index
|
||||
lda #$00 ; For XAM mode
|
||||
tax ; 0 -> x
|
||||
SETSTOR:
|
||||
asl ; Leaves $7B if setting STOR mode
|
||||
SETMODE:
|
||||
sta MODE ; $00 = XAM, $7B = STOR, $AE = BLOCK XAM
|
||||
BLSKIP: iny ; Advance text index
|
||||
NEXTITEM:
|
||||
lda IN,y ; Get character
|
||||
cmp #CR ; CR?
|
||||
beq GETLINE ; Yes, done this line
|
||||
cmp #DOT ; "."?
|
||||
bcc BLSKIP ; Skip delimiter
|
||||
beq SETMODE ; Set BLOCK XAM mode
|
||||
cmp #COLON ; ":"?
|
||||
beq SETSTOR ; Yes, set STOR mode
|
||||
cmp #R ; "R"?
|
||||
beq RUN ; Yes, run user program
|
||||
stx L ; $00 -> L
|
||||
stx H ; and H
|
||||
sty YSAV ; Save Y for comparison
|
||||
NEXTHEX:
|
||||
lda IN,y ; Get character for hex test
|
||||
eor #$B0 ; Map digits to $0-9
|
||||
cmp #$0A ; Digit?
|
||||
bcc DIG ; Yes
|
||||
adc #$88 ; Map letter "A"-"F" to $FA-FF
|
||||
cmp #$FA ; Hex letter?
|
||||
bcc NOTHEX ; No, character not hext
|
||||
DIG: asl
|
||||
asl ; Hex digit to MSD of A
|
||||
asl
|
||||
asl
|
||||
ldx #$04 ; Shift count
|
||||
HEXSHIFT:
|
||||
asl ; Hex digit left, MSB to carry
|
||||
rol L ; Rotate into LSD
|
||||
rol H ; Rotate into MSD's
|
||||
dex ; Done 4 shifts?
|
||||
bne HEXSHIFT ; No, loop
|
||||
iny ; Advance text index
|
||||
bne NEXTHEX ; Always taken. Check next character for hex
|
||||
NOTHEX:
|
||||
cpy YSAV ; Check if L, H empty (no hex digits)
|
||||
beq ESCAPE ; Yes, generate ESC sequence
|
||||
bit MODE ; Test MODE byte
|
||||
bvc NOTSTOR ; B6 = 0 for STOR, 1 for XAM and BLOCK XAM
|
||||
lda L ; LSD's of hex data
|
||||
sta (STL,x) ; Store at current 'store index'
|
||||
inc STL ; Increment store index
|
||||
bne NEXTITEM ; Get next item (no carry)
|
||||
inc STH ; Add carry to 'store index' high order
|
||||
TONEXTITEM:
|
||||
jmp NEXTITEM ; Get next command item
|
||||
RUN: jmp (XAML) ; Run at current XAM index
|
||||
NOTSTOR:
|
||||
bmi XAMNEXT ; B7=0 for XAM, 1 for BLOCK XAM
|
||||
ldx #$02 ; Byte count
|
||||
SETADR: lda L-1,x ; Copy hex data to
|
||||
sta STL-1,x ; 'store index'
|
||||
sta XAML-1,x ; And to 'XAM index'
|
||||
dex ; Next of 2 bytes
|
||||
bne SETADR ; Loop unless X=0
|
||||
NXTPRNT:
|
||||
bne PRDATA ; NE means no address to print
|
||||
lda #CR ; CR
|
||||
jsr ECHO ; Output it
|
||||
lda XAMH ; 'Examine index' high-order byte
|
||||
jsr PRBYTE ; Output it in hex format
|
||||
lda XAML ; Low-order 'examine index' byte
|
||||
jsr PRBYTE ; Output it in hex format
|
||||
lda #COLON ; ":"
|
||||
jsr ECHO ; Output it
|
||||
PRDATA: lda #SPACE ; Blank
|
||||
jsr ECHO ; Output it
|
||||
lda (XAML,x) ; Get data byte at 'examine index'
|
||||
jsr PRBYTE ; Output it in hex format
|
||||
XAMNEXT:
|
||||
stx MODE ; 0 -> MODE (XAM mode)
|
||||
lda XAML
|
||||
cmp L ; Compare 'examine index' to hex data
|
||||
lda XAMH
|
||||
sbc H
|
||||
bcs TONEXTITEM ; Not less, so no more data to output
|
||||
inc XAML
|
||||
bne MOD8CHK ; Increment 'examine index'
|
||||
inc XAMH
|
||||
MOD8CHK:
|
||||
lda XAML ; Check low-order 'examine index' byte
|
||||
and #$07 ; For MOD 8 = 0
|
||||
bpl NXTPRNT ; Always taken
|
||||
PRBYTE: pha ; Save A for LSD
|
||||
lsr
|
||||
lsr
|
||||
lsr ; MSD to LSD position
|
||||
lsr
|
||||
jsr PRHEX ; Output hex digit
|
||||
pla ; Restore A
|
||||
PRHEX: and #$0F ; Mask LSD for hex print
|
||||
ora #ZERO ; Add "0"
|
||||
cmp #$BA ; Digit?
|
||||
bcc ECHO ; Yes, output it
|
||||
adc #$06 ; Add offset for letter
|
||||
ECHO: bit DSP ; DA bit (B7) cleared yet?
|
||||
bmi ECHO ; No, wait for display
|
||||
sta DSP ; Output character. Sets DA.
|
||||
rts ; Return
|
||||
; --------------------------------------------------------
|
||||
.word $0000 ; (unused)
|
||||
.addr $0F00 ; (NMI vector)
|
||||
.addr RESET ; (RESET vector)
|
||||
.addr $0000 ; (IRQ vector)
|
||||
Loading…
Reference in New Issue