41464 RAM Chip

• Organization: 64K x 4
• Speed 120ns
• NEC brand
• Package: 18 pin DIL
• New, old stock (not desoldered) - all tested before dispatch.

As used on late revision motherboards of Commodore 64, Spectrum +2A/+2B/+3 

Will also replace 4464 type RAM ICs.

4164 Spectrum "Upper RAM" Chip - Samsung / Panasonic Brand

• Organization: 64K x 1, Speed: 150ns or faster, 128-cycle refresh, Package: 16 pin DIL
• Unused, old stock parts. Good clean condition and tested for 2 hours before dispatch.
• Can be used individually or in any quantity to replace any of the original Upper RAM chips used in the Spectrum 48K (eg: Texas Instrumenents TMS4532-15NL3, TMS4532-15NL4,  OKI M3732H-20, M3732L-20). The RAM type jumper settings on the PCB can be ignored when using these chips (please see this page for more info regarding the Spectrum's Upper RAM.)
• These chips cannot be (directly) used to replace the "4116" chips used for the LOWER 16KB of RAM in the bottom left of the Spectrum's PCB.
• Also suitable for the Spectrum 128 and grey 128 +2 (but not the +2A or +3)

74LS04 Logic Inverter IC

As used in Issue 6A Spectrum motherboards and also on some models of Spectrum 128

74LS157 IC (Texas Instruments)

• Logic IC used in the ZX Spectrum (multiplexor chip) and in some models of Spectrum 128

78S05 5 Volt Regulator for Spectrum 128+2

• This is the higher power (2 Amp) version of the 7805 regulator as required by the 128+2

Diagnostic Test ROM for the Spectrum 128 / +2

• Because the ROM in the 128 / +2 is almost always in a socket, a cheap / easy was to run diagnostics is to simply replace it with an EPROM burned with a diagnostic test program. No PCB mods are required - you can simply swap back to the original ROM when everything is working.
• Please note the orientation of the ROM when fitting (the chips in the +2 are "upside down")
• By default, I supply the ROM programmed with my own diagnostic program but if you'd prefer Brendan Alford's ZX-Diagnostics ROM (or any other ROM images) just let me know in the Special Instructions box during checkout.

Original Spectrum 128+2 ULA Amstrad 40056

• Extracted from a socket (not soldered) and tested - working fine.
• Supplied with original heatsink
• Can also be used in the "Toastrack" Spectrum 128
• Remember when fitting, the Spectrum 128 +2 has chips orientated "upside down", ie: pin 1 is at the bottom left - I have marked this on the heatsink.

MuRata Switch Mode 5v Regulator for Spectrum 128 "Toast Rack"

A replacement for the cheap inefficient 7805 used in the Spectrum 128 "Toastrack". This high-efficiency switch mode regulator wastes very little power as heat so no heatsink connection is required. It mounts directly onto the PCB where the 7805-connector wires are soldered.

• High efficiency 5v 1.5A output
• Short circuit protection
• Over current shutdown
• Over temperature shutdown
• Unmodified for direct-PCB vertical mounting in Toastrack Spectrum (instructions included).
• Can also be used in the standard Spectrum48, but as this version of the MuRata regulator is unmodified it cannot be used on Spectrum48 Issue2 boards (in a rubber-key case) as the regulator must be horizontally mounted due to space constraints. (See the Spectrum Mods section for a version modded for horizontal mounting.)

TEA2000 Video Encoder IC

• As used in the Spectrum 128 +2 etc
• Symptoms when the IC is faulty include no video, monochrome only video.

Traco 2 Amp 5 Volt switching regulator

• Cool running power regulator capable of delivering 5 volts @ 2 Amps
• Replaces the L78S05 regulator header in the Spectrum 128+2 (solder direct to PCB)
• Large heatsink no longer needed.
• Pin out / fitting diagram included.