Own your own 1980's CP/M machine
This system consists of SC722 / SC721 SD card adapter, SD-Card, backplane SC723 to give a complete working computer system, I have made a few of these and am now selling this one as it's surplus to my needs. The parts are either NOS, new, or re-cycled from other projects, It has been used for several days for testing CP/M software. It's working and complete including the serial port to USB adapter, SD-Card adapter, SD-Card with lots of software on it. It can boot cp/m 3, cpm 2.2 and zpm (zdos) and more. This board has the latest RomWBW install 3.4.0
More info can be found on the designers web site:
CPU Card
https://smallcomputercentral.com/sc722-rcbus-z180-cpu-module/
Memory Card
https://smallcomputercentral.com/sc722-rcbus-z180-cpu-module/
BACKBLANE
https://smallcomputercentral.com/sc723-rcbus-backplane-3/
Main Hardware features:
1 x Z180 processor clocked at 18.432 MHz. (Rated at 33mhz), running in z80 mode
1 x 512k byte RAM.
2 x 512k byte Flash (ROM), typically containing RomWBW and SCM
2 x Serial ports, asynchronous, 5-volt, with software selectable baud rates.
1 x SD-card interface (for use with RomWBW)
1 x SD-card adapter.
1 x Status LED.
1 x Voltage supervisor and reset device (DS1233).
5 volt power in by 2.1 mm barrel socket, screw terminal, or pin header.
1 x Push button reset switch with pin header for external reset switch.
3 x 80-pin vertical backplane socket, compatible with most modules designed for RCBus/RC2014.
1 x Serial adapter to USB
1 x USB cable, A to mini-B
1 x Adapter cable, 6-way
One ROM contains SCM (Small Computer Monitor, supplied by the author of the project). The other contains RomWBW which is a robust ROM-based operating system for retro computers. It includes CP/M 2.2 and Z-System and supports a wide range of hardware, including SD cards, floppy disk (hardware required), hard disk(hardware required), Compact Flash cards(hardware required) for storage. RomWBW has been provided free of charge by its author Wayne Warthen. Thank you, Wayne. RomWBW can see the SD-CARD as slices of 8M that can be assigned drive letters in CP/M. It can see 256 slices on a 2gig SD-Card, the card provided is a 8GB and has the first few slices loaded with software. The rest are blank. I have jotted down a few instructions as to how to get to the software. Contents include:
The first 8 slices are auto mounted on drives, depending on how you boot the system. like this(example):
A cpm3 (ide0:0)
B / C RomWBW assigned
D Supercalc
E Mulitplan
F Hi-Tec C compiler.
G Turbo Pascal
H Zork games etc
I wordstar 3.3
J Cbasic
The remaining slices are as follows:
SD0:8 Assembler
SD0:9 Turbo Modula2
SD0:10 -SD0:14 Unused
There's lots of other software out on the internet, you can transfer this to the machine using Xmodem from many terminal emulators.
Expansion is available using the 80-pin RCBUS / RC2014 (40pin, 40pin extended and 80pin) bus socket.
You will need a terminal or a computer running a terminal emulation program, such as Tera Term or minicom to communicate with the system.
This system can be powered from the USB port on your computer, however I would recommend an external 5v USB adaptor to make full use of the back plane and not risk your USB power going off during power save on the computer.
Documentation
The documentation can be found at www.scc.me.uk. I have also put a few notes in with the system to explain how to access the slices on the SD-Card.
Dimensions
The assembled kit is approximately 10cm (4") x 10cm (4") x 6cm (2.5").
If you can come and collect I'll be happy to show you the system working. Feel free to ask questions before you buy.