G80-S v1.0 PCB


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Version 1.0 of the G80-S Micro Computer. These boards have been updated from the Beta version to support interrupts from the SIO.  While supplies last, this board comes with the proper capacitors and resistors.  If that is a deal breaker, you might check availability first.

NOTE:  You will need to either have a programmer capable of programming the GAL22V10 PLD or you will need to purchase the option that includes the PLD.  Without this PLD you will not be able to use this computer.  I have additional PLDs on order.  If they are unavailable and you need one, contact me to put you on a mailing list to be notified once they are available.


  • Z80 CPU @ 6mhz (Recommended)
    -Faster clock can be used.
  • 32k ROM
  • 32k RAM
  • 24 GPIO via 8255 PIO
  • 2x RS-232 Ports @ 56700 Baud (No Handshaking, Send CR & LF)
  • 40-Pin Z80 Bus Breakout
  • Precompiled Software v0.50b
    -Machine Code Monitor
    -TinyBASIC 2.5g (includes I/O and Memory Instructions)
    -Intel HEX Loading
    -Disk Routines Planned.

To build this board you will need the following components:

The Software:  v0.50b

2 – MAX232
1 – GAL22V10 – Programmed with G80-S JEDEC File     *optional add-on*
1 – Z80 Microprocessor
1 – 28C256 EEPROM
1 – “Narrow” 32k SRAM (UM61256 or Equivalent)
1 – Z80 DART or Z80 SIO/0
1 – i8255 PIO
1 – 6x6x6mm Tactile Switch
2 – Male DB9 Sockets
1 – XO Oscillator of your frequency choice (Software designed for 6mhz)
1 – XO Oscillator 1.8432mhz
16 – 100nf Capacitors (0805 Footprint)     *included while available*
6 – 10k Resistors (0805 Footprint)     *included while available*

Optional (but recommended) Components:

3 – DIP-40 0.600″ Sockets
1 – DIP-28 0.600″ Socket
1 – DIP-28 0.300″ Socket
1 – DIP-24 0.300″ Socket
2 – DIP-16 0.300″ Sockets
1 – 40-Pin Header 2.54mm
1 – 26-Pin Header 2.54mm
1 – Computer Peripheral Power Supply Connector

Additional information

Weight 1 oz

Just the Board, Board & GAL22V10


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