PC-RETRO Motherboard Kit: IBM Clone Computer

Kit for building the PC-Retro

The PC-RETRO Kit Beta (Catalog #PC-RETRO) is a hobby electronics kit for building a faithful reproduction of the classic IBM PC 5150 motherboard from 1982. We have been in development on this new product offering for over 1 year. We started with the original circuit diagrams, as published by IBM in their Technical Reference Manual. These open source circuit diagrams launched the explosion in PC clone products that followed the IBM PC introduction. Reverse engineering the original IBM board was a substantial undertaking, as we found many differences between the 'official' circuit diagrams and actual board construction. Additionally, you can imagine the complexity of trouble-shooting this board and verifying the correct operation! Not to mention the logistical challenge of sourcing the original vintage electronic parts. You will receive all the components to build a PC Motherboard exactly as shown here:

Completed PC-Retro Motherboard

Obviously, this is a project for an advanced electronic hobbyist and computer enthusiast. The computer is supplied with the 'ANONYMOUS' BIOS operating system and 64K of memory.  We also have added IC sockets for all chips, knowing this is a huge hobbyist advantage, despite the additional cost. You will need to provide all the other parts to create a working computer system, such as power supply, keyboard and video output card/monitor. There exists an unbelievable amount of software, diagnostics, documentation and hardware to support this board.  After all... it is, for all intents and purposes, completely compatible with the original IBM PC.

As a special bonus we are now including an 8087 math coprocessor with every kit!

Specifications: Electronic Kit to build a IBM PC Clone Motherboard of the 5150 Computer, with ANONYMOUS BIOS, 64KB Memory, All IC locations are socketed 

Please note: This is an advanced electronic kit requiring careful assembly, which includes fine soldering, good attention to detail and knowledge of computers.  Your project will need to be self-directed. Building a computer is an advanced electronic project. We are not able to offer returns on kits after construction has started. 

 PC-RETRO KIT (Catalog # PC-Retro)...... $247.50 with free Priority Mail Shipping, USA Only

SORRY: This item is currently sold out. Please check back. MTM 4/12/2021 


Memory Bank for PC-RETRO

The PC-RETRO MEMORY BANK OPTION (Catalog #MEMORY) is an optional item which will expand the onboard memory of the PC-RETRO by another 64 KB. The memory of the PC-RETRO is measured in 'BANKS' of 64 KB each, in exactly the same way as the original IBM PC. The PC-RETRO motherboard will hold up to 4 banks of memory, for a total of 256 KB. Since the PC-Retro Kit is supplied with one full bank already, you can add up to 3 more banks. Note: It is not necessary to add more memory for the PC-RETRO to work. The PC-Retro kit will boot and function with the memory included with the kit, so adding more memory with this 9 piece chipset is strictly optional!


ROM Adapter with Diagnostics Landmark Supersoft Screen Shot

The PC-RETRO DIAGNOSTIC ROM ADAPTER (Catalog #DIAGROM) is an optional diagnostic tool that PC-Retro Kit Builders and IBM 5150 PC Enthusiasts may find especially useful.  This adapter allows you to replace the BIOS ROM IC at location U33 with a pre-programmed IC which will execute a detailed series of functional tests on your Motherboard.  This setup is great for troubleshooting either the PC-Retro or the original IBM PC.  The software program is the vintage Landmark/SuperSoft Diagnostic as described here: Program Details. Using an IC adapter allows use of the more common 27XXX series ROM chips, as described here: Adapter Details.  Note that this program requires either an MDA, Hercules or CGA video adapter to provide video output.  The program also has audio output to relay some basic information without a display.  


The PC-RETRO PCB (Catalog #PC-PCB) is an option to purchase only the bare PCB (Printed Circuit Board). We are offering the bare PCB after having received numerous requests from hobbyists. This PCB is useful for building-out different parts of the PC circuit at your own pace using the circuit diagrams provided in the IBM 5150 Technical Reference Manual. You will receive only the bare board via 1st Class Mail. Please Note: This is an item for advanced electronic hobbyists!



NOTE: We are sold out of the PC-Retro Kits. We plan to do one more run of this kits in June, 2021. Please email (mtm@mtmscientific.com) us if you would like to be placed on the waiting list. We will only be accepting payment by mail. Sorry: No International

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