The Memotech company started manufacturing expansion cards and high quality memory modules for the Sinclair ZX 81 home computer.
The British Memotech MTX 512 has a hardware which looks like the Sord M5. It also has characteristics, which are close to the MSX standard, but is not MSX compatible.
It uses a dedicated chip for video (Texas Instruments TM 9918 or 9928) and sound (Texas Instruments SN76489A) and has a very nice mechanical keyboard and a nice black aluminum case!
Both models have the same characteristics, but the MTX 500 has only 32 KB RAM and the 512, 64 KB. It had no success and was replaced a short time later by the RS-128.
Jon O'Brien reports:
I was in computer retail in Bracknell at the time the MTX was released, owned an MTX 512 (which I still have somewhere, I think) and spent quite a bit of time talking on the telephone to the owner of Memotech (whose name now escapes me) about stocking the machines. I was told at the time that much of the MSX design was based on the company's work on the MTX. How true this is I can't say, but it is a claim that was made at the time.
Service manual: http://primrosebank.net/computers/mtx/documents/Memotech_MTX500-512$20Service$20Manual.pdf
Saturday 29th November 2014
Tim Locke (New Brunswick, Canada)
please help we have zx spectrum 48k and one 128k program running at 6mhz using external ram and snapper discs from velesoft site