SEBHC

MTR90 upgrade is the right path to do. I loved to use Hex with the MTR90 as it is easy to debug.

The first computer I wrote code for was a PDP-8, toggling in on the front panel. The second, a PDP-11

I also want to thank Mike for collaborating with me to document the H8 Dual CF board. We have created

Well this Google group list is all still on line and searchable https://groups.google.com/g/sebhc

The new WD2797 works fine on the Heath H89-H37 Board . Same pins except for a few ones for circuit

On Fri, Nov 7, 2025 at 4:11 PM B 9 <hack...@gmail.com> wrote: The HDOS disk is probably fine.

DIU is focused on disk image management and does not include the H89 emulator in the H8D utility. It

Les, just started using your emulator on my windows laptop and I find it pretty great for my own use.

Sure, not hurry, but wow, those are cool keyboards. From: se...@googlegroups.com <sebhc@

I love it Lee! A great parody and story! Each Halloween I wonder what new ideas you come up with. I

I hope they do work to order some spares. Get Outlook for iOS From: se...@googlegroups.com <sebhc@

Since we have some new members who have little familiarity with Heath computers, I thought I'd

One shorted transistor and one blown transistor in the 53V regulator circuit. i removed all four to

I see it too, but not sure what is causing the issue 🤔 On Sat, Oct 18, 2025 at 6:30 PM Joseph Travis

You could use a rotary encoder to control the stepper in order to spin the cookie to clock the index

Did you check the Transistors under the black covers? One of those went bad for me (one on the left

I think the person to talk with is Mark Garlanger aka Heathkit Collector on discord. He created the

Thanks Norberto! I have the following corrections: 1. Please change jumper JP1 labeling from '/

Good to know, thanks! On Tue, Sep 23, 2025 at 9:03 AM Glenn Roberts <glenn.f...@gmail.com>

Darrell and I were fairly busy the entire time and didn't have much opportunity to spend time

imgur.com/a/0XZb6ma corrected link and forgot to say plus shipping. On Sunday, September 14, 2025 at

Jeff Tranter has been posting a series of YouTube videos on the Heathkit H-89 computer. He is up to

I recall someone did a KiCAD pcb with the components facing to the right, like the H89 16KB expansion

Nice 600ma +5v and +12V regulators at $2.75 prices each. Norberto From: Pololu Updates <inbox@

I agree with Lee. There's a reason I have 3 different EPROM programmers, although I could get

Here is a better photo showing all connections. The 7 ribbons on the top of the video board connect

I did test with the 1.44M floppy and it worked fine. How ever the data transfer is still 256bytes per

Wow. That's a damn fine looking system. -Dave On 8/11/25 19:25, Mike Cassidy wrote: > I'm

Great! Good to see some options for the h89 crowd… Sent from my iPad On Jul 31, 2025, at 11:58 AM,