2025-02-04: Teensy adapter kit is now included in the full kit.

My Brain-In-A-Jar Project

After 3 years in the making, better late than ever, RetroShield 6120 is finally ready for public. This retroshield is designed for the Harris HD-6120, which is PDP-8 on-a-chip.

• Teensy emulates Robert Armstrong's excellent SBC6120 HW design.
• BTS6120 monitor code (by Robert Armstrong
• You can modify teensy code to implement your own IOT's
• NOTE: There is no front-panel at this time. All communication happens over UART.

Experimental:

• booting OS8 from sdcard is work-in-progress. It boots to OS8 prompt, runs BASIC, etc.

What do you get?

Following options are available:

• Kit w/ a HD6120 cpu
• Kit without the HD6120 cpu (cost effective b/c expensive chips have higher transaction fees, which add up in the full kit price.)
• PCB only

What makes it special?

You can "breadboard in software" meaning you can design, change, update your hardware platform as easily as modifying the source code.

NOTE: International Shipping

• International shipping done using UPS/Fedex/DHL. You will pay initially $35 and if shipping is cheaper to your address, then I refund the difference.
• If you order other retroshields, Tindie does not do combined shipping. I will combine shipping and refund you the difference.
• If you don't see your country, please contact me. UPS/Fedex/DHL shipping varies greatly.

Notes on OS8

On poweron, SBC6120 boots into BTS6120 monitor code. You can view, edit, disassemble, panel and main memory, etc.

To boot into OS8, prepare SDCARD w/ disk image and type B in the monitor for bootstrap.

• "B" -> Boot into OS8
• "SET TTY NO PAUSE" -> Disable TTY pauses in OS8
• "DIR SYS:" -> show drive SYS:, mostly system.
• "DIR IDA1:" -> show drive IDA1:, mostly games.
• "BASIC" -> Start BASIC