Memotech MTX512S2

The Memotech MTX512S2 was a late and very rare development of the MTX512 produced after the original company's financial difficulties. It increased the computer's bank-switched memory to 256KB while retaining the familiar aluminium enclosure and MTX-compatible architecture.

The extra RAM was most useful with disk-based software and CP/M, building on the communications and storage capabilities developed for the earlier machines. Surviving documentation and production totals are limited.

Notable Features

• 256KB memory configuration expanded the late MTX architecture.
• Preserved compatibility with MTX512 software and peripheral concepts.
• Produced in very small numbers late in the platform's commercial life.

Historical Significance

• One of the final and least common production developments of the Memotech MTX family.
• Shows that the architecture continued to evolve after the mainstream home-computer market had moved on.

Collector’s Notes

• The MTX512S2 is exceptionally rare and specifications can vary between surviving accounts.
• Identification should be supported by model markings, board revision and installed memory rather than appearance alone.

Specifications

Technical Information
Name	Memotech MTX512S2
Manufacturer	Memotech
Launched	Wednesday, January 1, 1986
Country	United Kingdom
CPU	Zilog Z80A at 4 MHz
Units Sold
Operating System	MTX BASIC; CP/M with suitable disk hardware
I/O	Video, audio, joystick, printer, cassette, cartridge and system expansion
Keyboard	Integrated full-travel mechanical keyboard with numeric keypad
Storage	Cassette and compatible Memotech disk systems
Sound	SN76489A, three tone channels plus noise
Graphics	TMS9929A-compatible colour graphics, 256 x 192 pixels and sprites
Display	40 x 24 text; 80-column capability with disk hardware
ROM	MTX BASIC, monitor and system utilities in ROM
RAM	256KB bank-switched main RAM plus dedicated video RAM
CPU Speed	4 MHz