Designing a Memory/IO (ETA-3400) addon for the ET-3400 trainer

Dr. Scott Baker designed and built an ETA-3400 Memory/IO accessory for the vintage Heathkit ET-3400 trainer, that is available on GitHub:

I’ve always wanted one of these Heathkit microprocessor trainers, and finally one caught my eye on eBay and I pulled the trigger. The basic interaction with the trainer is through the onboard keypad and LED displays, but Heathkit also made an accessory that added additional ROM, RAM, serial port, and a cassette interface.
This allowed you to use a machine monitor over the serial port, and even featured a Tiny Basic interpreter in ROM that allowed the trainer to be programmed in Basic.

See the full post at smbaker.com.

Check out the video after the break.

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