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Make this my favourite ZXblast 512k (construction kit) - RAM pack and USB flash drive support

Retro Computers >> Sinclair >> Sinclair ZX81 >> Hardware >> General / Add-Ons
Listing type:
Fixed Price Multiple Items
Item Condition:
Seller location:
Germany, Germany
Ending in:
This listing is closed (04/04/2017)
Quantity Available
Latest buyer:
a***7 (8)
Fixed price:
Number Sold:
6 (View history)
Buyer Value Date and hour Quantity bought
a***7 (8) €44.90 01/04/2017 00:41:27 1
n***t (6) €44.90 29/03/2017 12:05:45 1
e***8 (28) €44.90 28/02/2017 17:33:02 1
i***t (22) €44.90 21/02/2017 19:15:06 1
b***d (46) €44.90 17/02/2017 13:11:17 1
b***d (10) €44.90 17/02/2017 13:01:16 1
Shipping Costs:
From only €1.50
Payment methods:
Feedback on this Item
PositivePositive i***t (22) ¡Thank you for everything! Swift delivery, very clear documentation and construction guide. ZXBlast is a great addition for any ZX81 system. 11/05/2017 10:44:33
PositivePositive b***d (46) Always a pleasure. Thanks again! 20/02/2017 15:37:33
PositivePositive b***d (10) Fast, excellent service 15/03/2017 10:49:05

Item Number : 22783

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ZXblast 512k (construction kit)
- memory extension / RAM pack plus USB flash drive support  -

up to 56k RAM and loading and saving programs from USB flash drive
including expansion through port (ZX81 extender board/module)
HRG compatible and M1NOT supported


printed circuit board for 16k/48k ZX Spectrum keyboard

This module offers up to 56k RAM for a ZX81 and allows to start up to 7 programs concurrently in different sessions. Only one (active) program is executed while other programs are halted in standby but can be activated with a simple keystroke. Programs can be loaded and stored easily from USB flash disks and interchanged with a PC or downloaded from the internet.

Up to 448k RAM can be used totally with one ZX81 application with paging/banking (requires programming skills). 512k flash ROM allows different or customized ZX81 (compatible) environments and using different drivers packed into the flash ROM by user.

Programs or games can be haltened, saved and continued later with the full instance backup feature (even if no SAVE offered or no return to commandline). Simple one key setup loads user defined programs and drivers after power-up fast and convenient (up to 7 different environments or sessions).

  • construction kit with pcb and all desired parts and preprogrammed devices (USB controller smd presoldered)
  • requires soldering skills
  • 512k RAM, 512k flash ROM
  • 2 USB ports for USB flash disks and peripherals
  • using 9V power supply to generate 5V (no additional heat for ZX81 internal)
  • inbuild RTC (real time clock) for correct timestamp when saving programs
  • all memory configurations available, 16k, 24k, 32k, 40k, 48k, 56k
  • HRG compatible (high resolution graphics from memory)
  • M1NOT compatible (execute code in memory window 32k-48k)
  • paging up to 448k RAM in 8k or 16k window size (requires programming skills)
  • through port with included ZX81 extender board

This module is also available as:

  • assembled version - ready to use/plug
  • 128k version

There are several other items for Sinclair products on sale.
Simply click here for all offers:

Picture gallery

  • ZXblast 512k (construction kit) - RAM pack and USB flash drive support
  • ZXblast 512k (construction kit) - RAM pack and USB flash drive support
  • ZXblast 512k (construction kit) - RAM pack and USB flash drive support

Questions and Answers

Shipping and Payment

Item Location:
Germany, Germany
Shipping conditions:
Buyer pays shipping expenses
Shipment fee:
  • To Germany :
  • Second Class Post : €1.50
  • To EU :
  • Surface Mail : €3.70
  • To Rest of Europe :
  • Surface Mail : €3.70
  • To Americas :
  • Surface Mail : €3.70
  • To Rest of World :
  • Surface Mail : €3.70
Shipment terms:
Payment via Paypal only

Shipment via local post for EUR 3.70 in all EU countries from Germany.

>Shipments within Germany EUR 1.50 only <
Payment methods:

The seller accepts all responsibility for this listing

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