mirror of
https://github.com/hsoft/collapseos.git
synced 2024-12-27 22:28:05 +11:00
7001446212
Recipes contain bits and pieces of hardware-related knowledge, but these bits feel sparse. I've been wanting to consolidate hardware- related documentation for a while, but always fell at odds with the recipes organisation. We don't have recipes anymore, just a /doc/hw section that contains hardware-related documentation which often translate to precise instructions to run Collapse OS on a specific machine. With this new organisation, I hope to end up with a better, more solid documentation.
58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
# Z80-MBC2
|
|
|
|
The Z80-MBC2[1] combines a Z80 and an ATMEGA32A to provide a
|
|
CP/m capable computing environment. It features a SD card
|
|
bootloader which makes running Collapse OS on it rather simple.
|
|
|
|
In this recipe, we're going to run Collapse OS on the Z80-MBC2,
|
|
interfacing through its serial port. We're going to use the
|
|
MBC's API to implement BLK on the SD card.
|
|
|
|
# Gathering parts
|
|
|
|
* A Z80-MBC2 computer with its SD card module and a properly
|
|
flashed "IOS" on the ATMega32A.
|
|
* A FTDI-to-TTL cable to connect to the serial port.
|
|
|
|
# Building the binary
|
|
|
|
Running "make" in arch/z80/z80mbc2 will yield "os.bin" which is
|
|
what we want.
|
|
|
|
# Running on the Z80-MBC2
|
|
|
|
Mount the SD card on your modern computer and copy "os.bin" as
|
|
"autoboot.bin", overwriting the binary that was previously
|
|
there.
|
|
|
|
We also have to copy the blkfs over. This is done by using IOS'
|
|
drive system. Each "DSxNyy.DSK" file on the card is a drive,
|
|
each drive has 512 track of 32 sectors of 512 bytes, so one
|
|
drive is plenty for our needs. Collapse OS hardcodes drive 0.
|
|
|
|
Each drive is part of a set. IOS theoretically supports up to 10
|
|
sets, but the binary shipped by default only accepts 4. You have
|
|
to overwrite an existing set. I used set 3. So, copy "blkfs" to
|
|
file "DS3N00.DSK". If you want, you can change the name of the
|
|
set by changing the contents of "DS3NAM.DAT".
|
|
|
|
Put back the SD card in the Z80-MBC2 and power it up by
|
|
connecting the FTDI adapter to it (red: VCC, black: GND, green:
|
|
TX, white: RX).
|
|
|
|
The FTDI adapter will show up as something like "ttyUSB0" (or
|
|
"ttyU0" on OpenBSD). Connect to it with "screen" or "cu" or
|
|
whatever you like. Baud rate of the Z80-MBC2 appears to be
|
|
hardcoded to 115200.
|
|
|
|
Then, enable IOS program selection by holding RESET and USER at
|
|
the same time, wait 2 seconds, releasing RESET, wait 2 seconds,
|
|
releasing USER. You should then be given a 1-8 choice.
|
|
|
|
You begin by selecting the proper disk set, which is through
|
|
choice 8, then you select the Autoboot binary through choice 4.
|
|
|
|
You are now in Collapse OS.
|
|
|
|
[1]: https://hackaday.io/project/159973-z80-mbc2-a-4-ics-homebrew-z80-computer
|