H8 Hardware
This page contains H8 expansion boards. These are brand new redesigned and modernized (when possible) PCBs.
Click here to download hi-res versions of the PCB layouts.
Feel free to download the Gerber files if you wish to produce your own boards. I use Ourpcb to manufacture my boards. They have good prices and include a silkscreen and solder mask.
For those that want to modify my cards you can download a complete set of all my KiCad projects here (9.5mb).
H8-FP Front Control Panel
Material List
A new front control panel design for the Heathkit H8 computer.
H8-FP Gerber Files
H8-BP Backplane
Material List
A new backplane/motherboard for the Heathkit H8 computer with ATX-style 24-pin power connector.
H8-BP Gerber Files
H8-Z80-64 Rev 2.2
Documentation (pdf)
Address decoder schematic (pdf)
H8-Z80-64 CPU/GIDE Gerber Files
H8-4
Material List
A replica of the original H8-4 Multi Serial Port Card from Heath but without the 20ma loop circuitry.
Docmentation (pdf)
H8-4 Gerber Files
H8-17
Material List
A replica of the WH17 Disk Controller from Heath. Modified to allow easy configuration for ORG0 and non-ORG0 systems as well as adding some diagnostic LEDs. Also note that there is an accompanying 1K adapter card that will convert the signals from the memory socket to a pair of 2114s as the original card had. This is for better compatibility with non-ORG0 systems.
Documentation (pdf)
H8-17 Gerber Files
H8-17 1K Adapter Gerber Files
H8-8-8
A smaller more compact version of the HA8-8 Extended Configuration card from Heath. This card inserts facing forward as opposed to the original which faced toward the back. This card along with the accompanying ROM (Part #444-70) converts an H8 computer to an ORG0 system. The ROM is supplied on a 2732 EEPROM which means you will need to configure your CPU card accordingly.
Documentation (pdf)
H8-8-8 Gerber Files
H8-64
A single-chip 64K RAM card with mini-prototyping area for ORG0 H8 systems.
Documentation (pdf)
H8-64 Gerber Files
H8-Z80-64 Rev 1.8
This PCB has been replaced by the Rev 2 board. It is shown here only for reference.
H8-Z80-64 CPU Card (108KB zip file)
Documentation (pdf)
SEBHC.ORG
March 13, 2011
