41464 RAM Chip

• Organization: 64K x 4
• Speed 120ns
• NEC brand
• Package: 18 pin DIL
• All tested before dispatch.

As used on late revision motherboards of Commodore 64, Spectrum 128 +2A/+2B/+3 

Will also replace 4464 type RAM ICs.

4164 RAM Chip - Texas Instruments Brand

• Organization: 64K x 1, Speed: 150ns or faster. Package: 16 pin DIL
• Unused, clean, old stock parts (condition as new - all chips tested before dispatch)
• Texas Instruments brand.

This chip will replace:

• Upper RAM chips in the ZX Spectrum 48K (Replaces TMS4532-15NL3, TMS4532-15NL4 , OKI M3732H-20 etc)*
• Spectrum 128 RAM chip (RAM in 'toast rack' 128k and in early 128 +2s) 
• Commodore 64 RAM chips (most 'breadbin' models use 8 RAM chips. Note: The 64C uses 2 x 41464)

*  These 4164 chips serve as a universal replacement for all the different types of UPPER RAM chips originally used in the Spectrum 48K - IE: You can use these to replace any number of bad chips at IC15-IC22 no matter what type of chips were originally installed (and the configuration links can be left alone). Please note: 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 48 PCB.

Faulty RAM chips in the C64 often result in an "Out of Memory" error on boot or less than 38911 bytes free. In the Spectrum, when the upper RAM is bad the system will often boot faster and work as a 16K machine. One crude but often effective way to test which chip is bad, is to "piggy-back" a working chip on each RAM chip one at a time. If the error goes away or at least changes, there's a good chance that chip is faulty.

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

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.