Sneak preview: NC Super89
glenn.f...@gmail.com
I’ve been privileged to be able to build and test out one of the pre-production runs of Norberto’s “NC Super89” CPU replacement board for the H89
https://koyado.com/heathkit/New-H8-Website/nc-super89-motherboard.html
Initially I had been testing the board in “single board computer” mode on the bench (using an H19 as the console), but tonight I installed it in an H89A chassis and powered up the end-to-end system for the first time:
https://photos.app.goo.gl/dN5zmDKvqBBNcbjT9
The system is running quite reliably at 16Mhz and using the on-board 512K RAM it runs CP/M3 (with 300K battery-backed RAM drive) just fine. Compiles are a breeze! Super speedy! The on-board VDIP interface lets me load and archive files easily via USB. For the hard drive I’m using a Z67-IDE+ (slightly visible in the above photo through the old 5-1/4” drive opening). I’ve tested with the Z37 and 3.5” floppy & Gotek with no issues. (eventually the drives will be mounted in the old H17 drive space). A number of us are testing the board and shaking out any bugs in the hardware and documentation. The small programmable OLED display on the board is a cute touch and fun to experiment with. Norberto has also developed a Wiznet board to go with this system. The onboard Pololu regulator keeps things running super cool.
Hopefully before too long we’ll have shaken out any bugs and have a production version of the NC Super89 available for broader use. It’s been an enjoyable experience. Huge thanks to Norberto Collado, Terry Smedley, Douglas Miller, Joe Travis, Darrell Pelan and the many others who’ve contributed to this project!
- Glenn
Joseph Travis
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Mike Cassidy
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