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Details about  Brand New Sinclair ZX81 ZXpand Interface Serial #00001

Brand New Sinclair ZX81 ZXpand Interface Serial #00001 See original listing
Item Ended
Item condition:
27 Mar, 2011 13:46:49 BST
Winning bid:
32 bids ]
£3.50 Standard Delivery | See details
Item location:
Stoke-on-Trent, United Kingdom


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  17 Mar, 2011 12:48:27 GMT  View all revisions

Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition


SellMyRetro - the home of retro computers and electronics

In Conjunction with:

RWAP Software - supporting retro computers since 1986

Is proud to present the ZXpand Interface for the Sinclair ZX81 Home Computer:

The ZXpand interface for the Sinclair ZX81 Home Computer

This auction is for the last pre-production ZXpand interface produced by Charlie Robson on 15th March 2011, Serial Number #00001.
The interface comes fully working and tested, together with a certificate of authenticity.

The ZXpand interface is a brand new interface for the Sinclair ZX81 Home Computer which provides the following facilities:

  • SD Memory Card reader - for instant loading from / saving to .p files (used by ZX81 emulators)
  • 32K of configurable RAM memory, which can then be set up to use the various hi-resolution graphics schemes for the Sinclair ZX81
  • New keywords are added to the system ROM to allow you to load and save programs, produce a catalogue of files on the memory
    card, configure the ZXpand Interface, and delete files.
  • You can still load programs from cassette as well as using the interface, to allow you to copy files onto the SD memory card
  • Sub-directories are supported on the memory card.
  • The new ROM can be switched off once a program is loaded, in order to allow access to LPRINT, LLIST and COPY commands.
  • There is a built in reset button to reset the ZX81 without having to pull the power lead.

The ZXpand interface for the Sinclair ZX81 Home Computer

Additionally, the following features may be added with either an add-on PCB or some soldering:

  • Zon-X81 Compatible AY sound interface
  • Atari style joystick adaptor for specially written or patched games
The manual for the interface appears on the RWAP Software website

The ZXpand interface for the Sinclair ZX81 Home Computer

A Short video of the ZXpand interface in action appears at:

  1. The SD Memory card and ZX81 Home Computer shown in the pictures is not included in the auction.
  2. Production of the ZXpand interfaces is due to start in April - they will be sold exclusively through - the online trading site for retro computers.
  3. If any changes are made between now and the final production run, the winning bidder will be able to return the interface for upgrading for just return postage.

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