The Grant Searle CP/M computer (almost 8 MHz!)

Vintage Events and off topic talk

The Grant Searle CP/M computer (almost 8 MHz!)

Postby no0207 » Jun Thu 20, 2013 12:28 pm

There is one tinkering technology that still fascinates me very much: Constructing things on a breadboard. That is how my personal experience with digital electronics began.
These days I ran into the project page of Grant Searle's breadboard CP/M computer:
http://searle.hostei.com/grant/cpm/
It looks very fascinating - at least to me - and hey! - it is a real CP/M machine running at almost 8 MHz! At the moment I am in the process of trying to get ahold of all the pieces and bits which are required for this neat thing. Have not found a vendor that still offers the fast CMOS versions of the Z80 family chips (named Z84C...) at a reasonable price - so cross your fingers for me that my orders from Hongkong make it to me ;)

Realisticly all pieces will be probably here within the next two weeks. I will keep you informed how things go, so stay tuned ;)

And in fact my interest in a CP/M computer system and to find the mentioned project page was triggered by FPGA experiments ;) Maybe somewhat later this year I will have an FPGA version of a CP/M Computer up and running, at a system clock that might be in a range of 25 MHz or even more.
Last edited by no0207 on Aug Thu 08, 2013 2:52 pm, edited 1 time in total.
no0207
 
Posts: 67
Joined: Nov Sun 04, 2012 11:36 am

Re: did anyone of you already try this?

Postby no0207 » Jul Fri 12, 2013 12:00 pm

Almost one month gone, and not much progress with my exemplar of the Grant Searle CP/M Computer :(
In fact it is difficult to get ahold of some Z84C chips (the fast CMOS version of the Z80 family). Ordered a CPU and a SIO/2 from Hongkong, after 3 Weeks of waiting I got 2 pieces of CPU instead :(

This afternoon I prepared the CF-Card Adapter (see attached photo). Soldering at the limits of my abilities. Please cross your fingers for me this thing will ever work ;)
Attachments
cf-adapter.jpg
cf-adapter.jpg (133.3 KiB) Viewed 11516 times
no0207
 
Posts: 67
Joined: Nov Sun 04, 2012 11:36 am

Re: did anyone of you already try this?

Postby no0207 » Jul Mon 15, 2013 11:40 am

***FINALLY*** a parcel with a Z84C SIO/2 arrived today. The last missing chip. I was already somewhat in panic because it appeared so hard to get one. Ordered from different vendors. Guess soon it will rain SIOs over here ;)
So this afternoon I began with the wiring. Half the way through it looks already very weird :?

Either this computer will work from the very first power on, wiring failure detection could be "mission almost impossible" otherwise.
Attachments
wirr1.jpg
wirr1.jpg (150.6 KiB) Viewed 11493 times
no0207
 
Posts: 67
Joined: Nov Sun 04, 2012 11:36 am


Return to Venues, projects and off topic stuff - NO SPAM

Who is online

Users browsing this forum: No registered users and 2 guests

cron