Baffa CP/M SBC

Another interpretation of the CP/M on breadboard by Grant Searle

Augusto Baffa

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Description

This is a Z80 CP/M SBC (single board computer) designed and compatible to Baffa-2 Peripheral Port. It has two port connections A and B for USB Serial connection and a RS232 connector attached to port B. Also, it can be expanded by connecting to Baffa Backplane to use boards compatible to Baffa-2 Homebrew Microcomputer.

The design is based on &quot;CP/M on breadboard by Grant Searle&quot; like many other retro projects. It&apos;s possible to use a RS232 connector via max232 or ch340 serial usb interfaces connected to RX/TX of SIO/2 ports A or B. Also, I&apos;ve also replaced the 628128 Ram by two 62256 ICs because it&apos;s easier to find nowadays :)

A future version will replace the DIP components by SMD ones and decrease board size.

Details

More Info:

Features:

CPU: Z80 running at 7.3728 MHz
Interface: Two high-speed serial ports at 115200 Baud. One with a fully compatible RS232 driver.
Disk: 64MB or 128MB Compact Flash card support, containing 8 or 16 logical drives, respectively.
RAM: 64K Byte
ROM: 16K Byte, switched off when CP/M active.
Resets: Both cold (full reset) and warm reset (used to return to CP/M prompt) circuitry
CP/M support: 2.2 with included software. More information about CP/M.

Schematics:

It's able to use internal or external clock and internal or external power supply. Also the peripheral bus can expand it by using other boards via Baffa Backplane.