Memotech MTX512

The Memotech MTX512 was the 64KB version of Memotech's aluminium-cased Z80 home computer. It shared the MTX500's dedicated video memory, sprite-capable colour graphics, three-channel sound and unusually comprehensive expansion connections.

The larger memory made the MTX512 the preferred base for Memotech's FDX floppy and HDX hard-disk packages, which could run CP/M and support an 80-column display. Despite strong specifications and construction, the range struggled against cheaper British rivals.

Notable Features

• 64KB main memory doubled the user RAM of the MTX500 while retaining separate video RAM.
• Optional communications board added twin RS-232 ports and the disk-system bus.
• FDX and HDX packages turned the home computer into a disk-based CP/M workstation.

Historical Significance

• The best-known Memotech computer and the centre of the company's ambitious expansion ecosystem.
• Memotech's costly attempt to supply computers for a major Soviet education project contributed to the company's financial collapse.

Collector’s Notes

• Disk hardware, communications board and CP/M software are much rarer than the base computer.
• Check that the external power supply matches the machine and local mains voltage.

Specifications

Technical Information
Name	Memotech MTX512
Manufacturer	Memotech
Launched	Saturday, October 1, 1983
Launch Price	£315
Country	United Kingdom
CPU	Zilog Z80A at 4 MHz
Units Sold
Operating System	MTX BASIC and monitor; CP/M with suitable disk hardware
I/O	RF, composite video, audio, two joystick ports, Centronics, cassette, cartridge and expansion
Keyboard	Integrated full-travel mechanical keyboard with numeric keypad
Storage	Cassette up to 2400 baud; optional FDX floppy and HDX hard-disk systems
Sound	SN76489A, three tone channels plus noise
Graphics	TMS9929A, 256 x 192 pixels, 16 colours and 32 sprites
Display	40 x 24 text; optional 80-column display with FDX or HDX
ROM	24KB containing MTX BASIC, monitor and utilities
RAM	64KB main RAM plus 16KB video RAM; expandable to 512KB
CPU Speed	4 MHz