Retroleum.co.uk

Spare parts for Commodore 64, ZX Spectrum and more!

14-2-2025: Currently taking a break. The store will re-open on 22nd February 2025. Cheers, Phil.

Replacement motherboards for the 48K ZX Spectrum

All boards have been carefully refurbished by myself, cleaned and tested thoroughly for several hours. Tests include load from tape, keyboard input, speaker, RAM, ROM, Z80 M1 signal and a 2-hour soak-test.

Images are just for illustration - see the item descriptions for the exact type. If you need a reset switch for the Plus case (and there's some in stock) please add one to your cart and - if you wish - ask me (in the Special Instructions box during checkout) to solder it on before dispatch - no charge for that:)

Some boards are sold without ULA chips - please see the individual item descriptions.

Products:

Click on the product thumbnail for an enlarged view.

Internal reset switch for Spectrum+ *New*

New internal reset switch for Spectrum+ or Toastrack 128

Brand new
Same as original reset switch but has a light grey plunger instead of brown/black (Note: if you have an original reset switch that has gone bad, you can actually swap the original plunger to the new switch body by gently tilting it to the side until it comes out (care must be taken to avoid breaking anything.)
For Spectrum+ and Toastrack 128

Internal reset switch for Spectrum+ *Original*

An original internal reset switch for Spectrum+ (used) and Toastrack 128

As used in the Spectrum+ (soldered across capacitor C27 - or at the provided pads on issue 6 motherboards)
Also used in the Toastrack 128
Tested, working.

Replacement Sinclair ZX Spectrum Motherboard Issue 3B

Sinclair Spectrum 48K Motherboard Issue 3B, UK PAL With Sinclair ULA

Re-capped (with blue Axial capacitors) and composite modded - fully tested

Replacement Sinclair ZX Spectrum Motherboard Issue 4A *Yellow*

Sinclair Spectrum 48K Motherboard Issue 4A Yellow PCB with Sinclair ULA

These are the rarer Issue 4A yellow PCBs with blue silk screen legend.
Re-capped (blue axial caps) and modded to give composite video instead of RF.

Replacement Sinclair ZX Spectrum Motherboard Issue 4B

Sinclair Spectrum 48K Motherboard Issue 4B With Sinclair ULA

Re-capped and composite modded.
With 6C001E-7 ULA installed

Replacement Sinclair ZX Spectrum Motherboard Issue 4S

Sinclair Spectrum 48K Motherboard Issue 4S with Sinclair ULA

Re-capped (blue axial caps) and video output modded to deliver composite video instead of RF.
Full working order. Tests include Ear input, M1 signal, edge connector, keyboard inputs etc.
4S boards were often found in the Spectrum Plus and the rubber key Spectrums manufactured by Samsung.