nascom basic compiles and works
This commit is contained in:
Joppe Blondel
@@ -25,6 +25,8 @@ TINYBASIC_SRC := apps/tinybasic/tinybasic.asm
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TINYBASIC_BUILD := $(BUILDDIR)/tinybasic
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TAPE_LOADER_SRC := apps/casette/tape_loader.asm
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TAPE_LOADER_BUILD := $(BUILDDIR)/casette
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NASCOM_BASIC_SRC := apps/nascom_basic/basic.asm
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NASCOM_BASIC_BUILD := $(BUILDDIR)/nascom_basic
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.DEFAULT_GOAL := metal
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@@ -48,6 +50,9 @@ metal: $(BUILDDIR)/metal/$(TARGET).ihx $(BUILDDIR)/metal/$(TARGET).bin $(BUILDDI
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@printf " Tape loader: %5u ROM bytes at %04X\n" \
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$$(wc -c < $(TAPE_LOADER_BUILD)/tape_loader.bin) \
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$$(( $(TAPE_LOADER_ROM_ADDRESS) ))
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@printf " NASCOM BASIC: %5u ROM bytes at %04X\n" \
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$$(wc -c < $(NASCOM_BASIC_BUILD)/nascom_basic.bin) \
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$$(( $(NASCOM_BASIC_ROM_ADDRESS) ))
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$(BUILDDIR)/metal/$(TARGET).ihx: $(METAL_RELFILES)
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@mkdir -p $(@D)
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@@ -56,13 +61,14 @@ $(BUILDDIR)/metal/$(TARGET).ihx: $(METAL_RELFILES)
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$(BUILDDIR)/metal/$(TARGET).flat.bin: $(BUILDDIR)/metal/$(TARGET).ihx
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$(METAL_MAKEBIN) -s $(METAL_IMAGE_SIZE) $< $@
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$(BUILDDIR)/metal/$(TARGET).prog.bin: $(BUILDDIR)/metal/$(TARGET).flat.bin $(TINYBASIC_BUILD)/tinybasic.bin $(TAPE_LOADER_BUILD)/tape_loader.bin
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$(BUILDDIR)/metal/$(TARGET).prog.bin: $(BUILDDIR)/metal/$(TARGET).flat.bin $(TINYBASIC_BUILD)/tinybasic.bin $(TAPE_LOADER_BUILD)/tape_loader.bin $(NASCOM_BASIC_BUILD)/nascom_basic.bin
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@set -e; \
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payload_end=$$(awk '$$1 == "DEF" && $$2 == "resident_image_end" { print $$3 }' $(BUILDDIR)/metal/$(TARGET).noi); \
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payload_size=$$((payload_end - $(RESIDENT_RAM_BASE))); \
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payload_rom_end=$$(( $(RESIDENT_ROM_OFFSET) + payload_size )); \
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tiny_size=$$(wc -c < $(TINYBASIC_BUILD)/tinybasic.bin); \
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tape_size=$$(wc -c < $(TAPE_LOADER_BUILD)/tape_loader.bin); \
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nascom_size=$$(wc -c < $(NASCOM_BASIC_BUILD)/nascom_basic.bin); \
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if test $$payload_size -le 0; then \
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echo "error: resident image is empty or has an invalid end symbol" >&2; exit 1; \
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fi; \
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@@ -74,14 +80,19 @@ $(BUILDDIR)/metal/$(TARGET).prog.bin: $(BUILDDIR)/metal/$(TARGET).flat.bin $(TIN
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printf "error: Tiny BASIC ends at %04X, beyond tape-loader origin %04X\n" \
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$$(( $(TINYBASIC_ROM_ADDRESS) + tiny_size )) $$(( $(TAPE_LOADER_ROM_ADDRESS) )) >&2; exit 1; \
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fi; \
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if test $$(( $(TAPE_LOADER_ROM_ADDRESS) + tape_size )) -gt $$(( $(ROM_SIZE) )); then \
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printf "error: tape loader ends at %04X, beyond ROM size %04X\n" \
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$$(( $(TAPE_LOADER_ROM_ADDRESS) + tape_size )) $$(( $(ROM_SIZE) )) >&2; exit 1; \
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if test $$(( $(TAPE_LOADER_ROM_ADDRESS) + tape_size )) -gt $$(( $(NASCOM_BASIC_ROM_ADDRESS) )); then \
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printf "error: tape loader ends at %04X, beyond NASCOM BASIC origin %04X\n" \
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$$(( $(TAPE_LOADER_ROM_ADDRESS) + tape_size )) $$(( $(NASCOM_BASIC_ROM_ADDRESS) )) >&2; exit 1; \
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fi; \
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dd if=$< of=$@ bs=1 count=$$(( $(TAPE_LOADER_ROM_ADDRESS) )) status=none; \
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if test $$(( $(NASCOM_BASIC_ROM_ADDRESS) + nascom_size )) -gt $$(( $(ROM_SIZE) )); then \
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printf "error: NASCOM BASIC ends at %04X, beyond ROM size %04X\n" \
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$$(( $(NASCOM_BASIC_ROM_ADDRESS) + nascom_size )) $$(( $(ROM_SIZE) )) >&2; exit 1; \
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fi; \
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dd if=$< of=$@ bs=1 count=$$(( $(NASCOM_BASIC_ROM_ADDRESS) )) status=none; \
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dd if=$< of=$@ bs=1 skip=$$(( $(RESIDENT_RAM_BASE) )) seek=$$(( $(RESIDENT_ROM_OFFSET) )) count=$$payload_size conv=notrunc status=none; \
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dd if=$(TINYBASIC_BUILD)/tinybasic.bin of=$@ bs=1 seek=$$(( $(TINYBASIC_ROM_ADDRESS) )) conv=notrunc status=none; \
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dd if=$(TAPE_LOADER_BUILD)/tape_loader.bin of=$@ bs=1 seek=$$(( $(TAPE_LOADER_ROM_ADDRESS) )) conv=notrunc status=none
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dd if=$(TAPE_LOADER_BUILD)/tape_loader.bin of=$@ bs=1 seek=$$(( $(TAPE_LOADER_ROM_ADDRESS) )) conv=notrunc status=none; \
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dd if=$(NASCOM_BASIC_BUILD)/nascom_basic.bin of=$@ bs=1 seek=$$(( $(NASCOM_BASIC_ROM_ADDRESS) )) conv=notrunc status=none
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$(BUILDDIR)/metal/$(TARGET).bin: $(BUILDDIR)/metal/$(TARGET).flat.bin $(BUILDDIR)/metal/$(TARGET).prog.bin
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dd if=$< of=$@ bs=$(METAL_BIN_SIZE) count=1 status=none
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@@ -125,6 +136,10 @@ $(TAPE_LOADER_BUILD)/tape_loader.bin: $(TAPE_LOADER_BUILD)/tape_loader.flat.bin
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test $$loader_size -gt 0; \
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dd if=$< of=$@ bs=1 skip=$$(( $(TAPE_LOADER_ROM_ADDRESS) )) count=$$loader_size status=none
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$(NASCOM_BASIC_BUILD)/nascom_basic.bin: $(NASCOM_BASIC_SRC)
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@mkdir -p $(@D)
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zasm --z80 $< -o $@ -l0
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$(LAYOUT_HEADER): $(LAYOUT_CONFIG)
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@mkdir -p $(@D)
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@awk 'BEGIN { print "#ifndef ROM_LAYOUT_H"; print "#define ROM_LAYOUT_H"; print "" } \
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@@ -0,0 +1,2 @@
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*.bin
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*.lst
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File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,202 @@
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;==================================================================================
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; Contents of this file are copyright Grant Searle
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;
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; You have permission to use this for NON COMMERCIAL USE ONLY
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; If you wish to use it elsewhere, please include an acknowledgement to myself.
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;
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; http://searle.hostei.com/grant/index.html
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;
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; eMail: home.micros01@btinternet.com
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;
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; If the above don't work, please perform an Internet search to see if I have
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; updated the web page hosting service.
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;
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;==================================================================================
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; Minimum 6850 ACIA interrupt driven serial I/O to run modified NASCOM Basic 4.7
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; Full input buffering with incoming data hardware handshaking
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; Handshake shows full before the buffer is totally filled to allow run-on from the sender
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SER_BUFSIZE .EQU 3FH
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SER_FULLSIZE .EQU 30H
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SER_EMPTYSIZE .EQU 5
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RTS_HIGH .EQU 0D6H
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RTS_LOW .EQU 096H
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serBuf .EQU $2000
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serInPtr .EQU serBuf+SER_BUFSIZE
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serRdPtr .EQU serInPtr+2
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serBufUsed .EQU serRdPtr+2
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basicStarted .EQU serBufUsed+1
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TEMPSTACK .EQU $20ED ; Top of BASIC line input buffer so is "free ram" when BASIC resets
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CR .EQU 0DH
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LF .EQU 0AH
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CS .EQU 0CH ; Clear screen
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.ORG $0000
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;------------------------------------------------------------------------------
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; Reset
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RST00 DI ;Disable interrupts
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JP INIT ;Initialize Hardware and go
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;------------------------------------------------------------------------------
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; TX a character over RS232
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.ORG 0008H
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RST08 JP TXA
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;------------------------------------------------------------------------------
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; RX a character over RS232 Channel A [Console], hold here until char ready.
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.ORG 0010H
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RST10 JP RXA
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;------------------------------------------------------------------------------
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; Check serial status
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.ORG 0018H
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RST18 JP CKINCHAR
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;------------------------------------------------------------------------------
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; RST 38 - INTERRUPT VECTOR [ for IM 1 ]
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.ORG 0038H
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RST38 JR serialInt
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;------------------------------------------------------------------------------
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serialInt: PUSH AF
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PUSH HL
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IN A,($80)
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AND $01 ; Check if interupt due to read buffer full
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JR Z,rts0 ; if not, ignore
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IN A,($81)
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PUSH AF
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LD A,(serBufUsed)
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CP SER_BUFSIZE ; If full then ignore
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JR NZ,notFull
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POP AF
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JR rts0
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notFull: LD HL,(serInPtr)
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INC HL
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LD A,L ; Only need to check low byte becasuse buffer<256 bytes
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CP (serBuf+SER_BUFSIZE) & $FF
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JR NZ, notWrap
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LD HL,serBuf
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notWrap: LD (serInPtr),HL
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POP AF
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LD (HL),A
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LD A,(serBufUsed)
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INC A
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LD (serBufUsed),A
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CP SER_FULLSIZE
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JR C,rts0
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LD A,RTS_HIGH
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OUT ($80),A
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rts0: POP HL
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POP AF
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EI
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RETI
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;------------------------------------------------------------------------------
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RXA:
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waitForChar: LD A,(serBufUsed)
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CP $00
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JR Z, waitForChar
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PUSH HL
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LD HL,(serRdPtr)
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INC HL
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LD A,L ; Only need to check low byte becasuse buffer<256 bytes
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CP (serBuf+SER_BUFSIZE) & $FF
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JR NZ, notRdWrap
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LD HL,serBuf
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notRdWrap: DI
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LD (serRdPtr),HL
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LD A,(serBufUsed)
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DEC A
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LD (serBufUsed),A
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CP SER_EMPTYSIZE
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JR NC,rts1
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LD A,RTS_LOW
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OUT ($80),A
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rts1:
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LD A,(HL)
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EI
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POP HL
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RET ; Char ready in A
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;------------------------------------------------------------------------------
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TXA: PUSH AF ; Store character
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conout1: IN A,($80) ; Status byte
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BIT 1,A ; Set Zero flag if still transmitting character
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JR Z,conout1 ; Loop until flag signals ready
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POP AF ; Retrieve character
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OUT ($81),A ; Output the character
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RET
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;------------------------------------------------------------------------------
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CKINCHAR LD A,(serBufUsed)
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CP $0
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RET
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PRINT: LD A,(HL) ; Get character
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OR A ; Is it $00 ?
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RET Z ; Then RETurn on terminator
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RST 08H ; Print it
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INC HL ; Next Character
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JR PRINT ; Continue until $00
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RET
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;------------------------------------------------------------------------------
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INIT:
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LD HL,TEMPSTACK ; Temp stack
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LD SP,HL ; Set up a temporary stack
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LD HL,serBuf
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LD (serInPtr),HL
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LD (serRdPtr),HL
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XOR A ;0 to accumulator
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LD (serBufUsed),A
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LD A,RTS_LOW
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OUT ($80),A ; Initialise ACIA
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IM 1
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EI
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LD HL,SIGNON1 ; Sign-on message
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CALL PRINT ; Output string
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LD A,(basicStarted); Check the BASIC STARTED flag
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CP 'Y' ; to see if this is power-up
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JR NZ,COLDSTART ; If not BASIC started then always do cold start
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LD HL,SIGNON2 ; Cold/warm message
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CALL PRINT ; Output string
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CORW:
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CALL RXA
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AND %11011111 ; lower to uppercase
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CP 'C'
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JR NZ, CHECKWARM
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RST 08H
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LD A,$0D
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RST 08H
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LD A,$0A
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RST 08H
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COLDSTART: LD A,'Y' ; Set the BASIC STARTED flag
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LD (basicStarted),A
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JP $0150 ; Start BASIC COLD
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CHECKWARM:
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CP 'W'
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JR NZ, CORW
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RST 08H
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LD A,$0D
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RST 08H
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LD A,$0A
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RST 08H
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JP $0153 ; Start BASIC WARM
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SIGNON1: .BYTE CS
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.BYTE "Z80 SBC By Grant Searle",CR,LF,0
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SIGNON2: .BYTE CR,LF
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.BYTE "Cold or warm start (C or W)? ",0
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.END
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@@ -13,3 +13,4 @@ RESIDENT_DATA_BASE := 0xF000
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TINYBASIC_ROM_ADDRESS := 0x1400
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TAPE_LOADER_ROM_ADDRESS := 0x3000
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NASCOM_BASIC_ROM_ADDRESS := 0x4000
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