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13
recipes/z80mbc2/Makefile
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13
recipes/z80mbc2/Makefile
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TARGET = os.bin
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BASEDIR = ../..
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EDIR = $(BASEDIR)/emul
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STAGE = $(EDIR)/stage
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.PHONY: all
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all: $(TARGET)
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$(TARGET): xcomp.fs $(STAGE)
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cat xcomp.fs | $(STAGE) > $@
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$(STAGE):
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$(MAKE) -C $(EDIR) stage
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41
recipes/z80mbc2/README.md
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recipes/z80mbc2/README.md
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# Z80-MBC2
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The [Z80-MBC2][link] combines a Z80 and an ATMEGA32A to provide a CP/m capable
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computing environment. It features a SD card bootloader which makes running
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Collapse OS on it rather simple.
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## Recipe
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In this recipe, we're going to run Collapse OS on the Z80-MBC2, interfacing
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through its serial port. We're going to use the MBC's API to implement BLK on
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the SD card. (the BLK part isn't done yet. TODO)
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### Gathering parts
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* A Z80-MBC2 computer with its SD card module and a properly flashed "IOS" on
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the ATMega32A.
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* A FTDI-to-TTL cable to connect to the serial port.
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### Building the binary
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Running `make` will yield `os.bin` which is what we want.
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### Running on the Z80-MBC2
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Mount the SD card on your modern computer and copy `os.bin` as `autoboot.bin`,
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overwriting the binary that was previously there.
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Put back the SD card in the Z80-MBC2 and power it up by connecting the FTDI
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adapter to it (red: VCC, black: GND, green: TX, white: RX).
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The FTDI adapter will show up as something like `ttyUSB0` (or `ttyU0` on
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OpenBSD). Connect to it with `screen` or `cu` or whatever you like. Baud rate of
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the Z80-MBC2 appears to be hardcoded to 115200.
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Then, enable IOS program selection by holding RESET and USER at the same time,
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wait 2 seconds, releasing RESET, wait 2 seconds, releasing USER. You should then
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be given a 1-8 choice, with 4 being "Autoboot". Type 4.
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You are now in Collapse OS.
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[link]: https://hackaday.io/project/159973-z80-mbc2-a-4-ics-homebrew-z80-computer
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19
recipes/z80mbc2/xcomp.fs
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recipes/z80mbc2/xcomp.fs
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0xff00 CONSTANT RS_ADDR 0xfffa CONSTANT PS_ADDR
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RS_ADDR 0x80 - CONSTANT RAMSTART
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212 LOAD ( z80 assembler )
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262 LOAD ( xcomp ) 270 LOAD ( xcomp overrides )
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282 LOAD ( boot.z80 ) 353 LOAD ( xcomp core low )
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CODE (emit)
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A 1 LDrn, 1 OUTnA, HL POPqq, A L LDrr, 0 OUTnA,
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;CODE
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CODE (key)
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BEGIN, 1 INAn, A INCr, JRZ, AGAIN,
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A DECr, PUSHA,
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;CODE
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380 LOAD ( xcomp core high )
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(entry) _
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( Update LATEST )
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PC ORG @ 8 + !
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," CURRENT @ HERE ! " EOT,
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ORG @ 256 /MOD 2 PC! 2 PC!
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H@ 256 /MOD 2 PC! 2 PC!
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