Recent content by mmruzek

Hi, I am getting low on the 8087 Math Coprocessors that I include with my PC-Retro Kits. I am wondering if anyone has a stash of new or recycled DIPs that they would consider selling as a lot? I'm thinking somewhere in the range of $5-$10 each in quantity. Negotiable. Please PM me if you have...

This IBM 5161 Expansion Unit lot is still available. I will be at the Monroe, Michigan USA Hamfest on June 15th if that works for anyone's schedule to pick this up. I am also willing to work with you on the price. Thanks! Michael

Another great website, in addition to the one mentioned by Ruud, is over at the AnyCPU forum... https://anycpu.org/forum/

If the public can be allowed on the premises, I would auction the items as lots-in-place, with viewing allowed the day before. The presence of a fork lift is a plus to help with loading. You will pay a fee based on a percentage of the gross. A good auctioneer with a track record can setup the...

This item has been sold. Thank You!

Yes, please check your direct messages for payment and contact information. Thanks!

Hi, Since the PC-Retro design files were published here last Spring I have had a few people tell me they needed the attached library file to view the schematics in Kicad. I am attaching it here for anyone that may need it going forward. I should also mention that I have managed to cobble...

Hi. Several years ago I purchased an odd lot of Harris RTX2000 CPU's on EBAY. I've recently had some time to create a development board to explore these fascinating devices. This CPU is considered to be a Forth engine because many of the language primitives are represented by machine opcodes...

Thank you for providing this design to the community. I appreciate that your website has the Gerbers and good documentation!

Hello, I have some RTX2000 CPU's from Harris and am working on laying out a development board for them. Harris published a technical guidebook around 1988, as shown in the photos, that would be helpful for my purposes. Would anyone have a copy they would care to sell or share? Thanks! Michael

This is a complete system consisting of a working IBM 5161 Expansion Unit, IBM 5160 XT Computer, IBM 5153 CGA Monitor and IBM Keyboard. This system boots as shown in the photos. I purchased the Expansion Unit and XT Computer about 10 years ago from a former IBM employee who used it as his...

This is a Cirrus Logic CL-GD5401-42QC-B VGA Video Card for 8 or 16 Bit ISA slots. One of the photos shows the Phoenix Technolgies BIOS boot screen when installed in a stock vintage IBM 5150 PC with 8 bit slots. This item is $50, with free Priority Mail shipping in the USA. Send a DM if...

This item is sold. Thank You!

This is a Breakthru 286 Accelerator Card, ISA for an 8 bit slot to speed up your vintage computer. Condition unknown. I purchased this at a swapfest 10 or 15 years ago. This item is $150 with free shipping by Priority Mail in the USA. The manual and software are available as discussed in this...

This is a Seagate Technology Model ST-412 10 MB 5.25" full height hard drive. Condition unknown. I seem to recall buying this at a computer swap about 30 years ago. I will ship this via Priority Mail to the USA for $20. Pickup OK in SE Michigan. Firm price is $80. Use PM to contact me. I will...