mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-01 20:40:55 +11:00
66 lines
2.2 KiB
Plaintext
66 lines
2.2 KiB
Plaintext
|
# RC2014
|
||
|
|
|
||
|
|
The RC2014[1] is a nice and minimal z80 system that has the
|
||
|
|
advantage of being available in an assembly kit. Assembling it
|
||
|
|
yourself involves quite a bit of soldering due to the bus
|
||
|
|
system. However, one very nice upside of that bus system is that
|
||
|
|
each component is isolated and simple.
|
||
|
|
|
||
|
|
The machine used in this recipe is the "Classic" RC2014 with an
|
||
|
|
8k ROM module , 32k of RAM, a 7.3728Mhz clock and a serial I/O.
|
||
|
|
|
||
|
|
The ROM module being supplied in the assembly kit is an EPROM,
|
||
|
|
not EEPROM, so you can't install Collapse OS on it. You'll have
|
||
|
|
to supply your own.
|
||
|
|
|
||
|
|
There are many options around to boot arbitrary sources. What
|
||
|
|
was used in this recipe was a AT28C64B EEPROM module. I chose it
|
||
|
|
because it's compatible with the 8k ROM module which is very
|
||
|
|
convenient. If you do the same, however, don't forget to set the
|
||
|
|
A14 jumper to high because what is the A14 pin on the AT27 ROM
|
||
|
|
module is the WE pin on the AT28! Setting the jumper high will
|
||
|
|
keep is disabled.
|
||
|
|
|
||
|
|
The goal is to have the shell running and accessible through the
|
||
|
|
Serial I/O.
|
||
|
|
|
||
|
|
You'll need specialized tools to write data to the AT28 EEPROM.
|
||
|
|
There seems to be many devices around made to write in flash and
|
||
|
|
EEPROM modules. If you don't have any but have a Arduino Uno,
|
||
|
|
take a look at doc/hw/arduinouno.
|
||
|
|
|
||
|
|
# Gathering parts
|
||
|
|
|
||
|
|
* A "classic" RC2014 with Serial I/O
|
||
|
|
* An AT28C64B and a way to write to it.
|
||
|
|
* A FTDI-to-TTL cable to connect to the Serial I/O module
|
||
|
|
|
||
|
|
# Build the binary
|
||
|
|
|
||
|
|
Building the binary is as simple as running "make" in
|
||
|
|
/arch/z80/rc2014. This will yield "os.bin" which can then be
|
||
|
|
written to EEPROM.
|
||
|
|
|
||
|
|
This build is controlled by the xcomp.fs unit, which loads
|
||
|
|
blk/618. That's what you need to modify if you want to customize
|
||
|
|
your build.
|
||
|
|
|
||
|
|
# Emulate
|
||
|
|
|
||
|
|
The Collapse OS project includes a RC2014 emulator suitable for
|
||
|
|
this image. You can invoke it with "make emul".
|
||
|
|
|
||
|
|
# Running
|
||
|
|
|
||
|
|
Put the AT28 in the ROM module, don't forget to set the A14
|
||
|
|
jumper high, then power the thing up. Connect a FTDI-to-TTL
|
||
|
|
cable to the Serial I/O module and identify the tty bound to it
|
||
|
|
(in my case, "/dev/ttyUSB0"). Then:
|
||
|
|
|
||
|
|
screen /dev/ttyUSB0 115200
|
||
|
|
|
||
|
|
Press the reset button on the RC2014 and the "ok" prompt should
|
||
|
|
appear.
|
||
|
|
|
||
|
|
[1]: https://rc2014.co.uk
|