Z80 Space-Time Productions Master Controller Board
Single Board Computer
Technical Support Information
This site is technical repository for information related to the
The Mission of this web site is to provide valuable technical information regarding this board to the community of people who own the MCB, as well as to be a valuable resource to people who develop for the Z80 microprocessor and related 8-bit computers.
Here's a link to EEWeb, the site for Electrical Engineers from all over to share their ideas and ongoing work:
Other hobbyists who use different Z80 based computers have also dropped by looking for information or have donated ideas and info.
These kits were sold by Ron Weiss Electronics; his Ebay identification is networkrw if you wish to contact him.
Just as there are probably infinite number of ideas and applications you can use this board for, there are also a number of ways you can configure it as well. It doesn't necessarily have to have all the Input/Output IC's and so forth. For instance, you may only need one PIO chip instead of three, and no keyboard/display interface, or maybe you only need 1K of ram to control something - it's entirely up to you to configure it how you need it.
There are a number of TTL gate IC's you will need for decoding, timing, and buffering. Refer to the schematic IC layout for a complete list of IC's, XTAL, resistors and capacitors also needed.
This is a really fun and versatile computer! Designed as an industrial controller, there is no CRT/video circuitry or mass storage interfaces. It does have RS-232 serial ports and a specialized Keyboard/Display adapter (8279) on board. It uses industry standard Intel P8255 I/O port chips so interfacing and control of the 'real world' is relatively easy.
Since this kit was supplied only as a pcb, you pretty much have the freedom to creatively enclose this computer any way you like. It was likely designed to be installed inside one or more pieces of pre-existing equipment.
Expansions I Have Made To This Computer:
While I like to believe that the possibilities are just about boundless, let me just preface everything by saying that you have to be a hobbyist on the level of enjoying things that work down to the bit level and one who likes vintage technology to get the sense of fulfillment that I have from this project. It can be all-consuming, and you should be prepared to funnel some funds and plenty of hours of research and soldering into it.
Here are a few things the users have done:
Here are some ideas that I have.
June 14, 2011 - This site is featured "Site of the Day" on EEWeb! Here's a link: Joel Owens Z80 Single Board Computers.
March 10, 2011 - BASIC2 is completed and available for download.
January 04, 2011 - Added several basic task routines to the software downloads page for entry level users. Code for the Am9511 Arithmetic Processor chip are still in work as of this writing.
October 21, 2010 - There are several new PDF files added which cover the AMD 9511 Math Processor chip. Begun Z80 code to convert ASCII scientific notation numbers to and from Am9511 format.
Recently, a visitor to the site informed me he bought one of these boards as a kit out of a magazine, possibly Byte.
July 13, 2010 - Douglas Goodall operates a discussion group for the Space-Time Productions Z80 MCB. It's located here:
In December 2009, I noted that Rodnay Zaks' "How to Program the Z80" book has been made available for free download. Follow the link provided earlier.
Also made available the preceeding link to Steve Ciarcia's book "Build Your Own Z80 Computer".
Can I still get these boards?
Alert reader David Ray noted some of these for sale on eBay January 2011: LINK HERE. They are the bare board and monitor rom ONLY, although other chips are in the photo.
Michael Lee Simon, designer and producer of this board, is on Facebook. You can visit with him as he has several boards and various items laying around his shop.
Sorry, but I only have a couple of these boards around in various states of progress. I wish I had more, I'd certainly sell any I could get my hands on.
If you own one of these computers, please take a moment to email me.
ALSO: If you bought one of these boards a while back and aren't using it, please contact me. They are increasingly rare and the IC's that were sold in the kits, such as the Z80 SIO and the Intel P8279, P8253 and P8255 chips are pretty useful, too. Thanks!
Are you missing some chips for your Space-Time computer? I have a wealth of DIP type IC's, several Z80 CPU's, 74LSxx series logic, the resistor network DIP, plenty of 2732 4Kx8 Eproms if you need your program burned onto a chip just for your particular application - Let me know!
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