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 128 +2A/+2B/+3 

Will also replace 4464 type RAM ICs.

4164 "Upper RAM" Chip - Texas Instruments Brand

• Organization: 64K x 1, Speed: 150ns or faster. Package: 16 pin DIL
• Unused, old stock parts. Good clean condition and tested for 2 hours before dispatch.

• VERY IMPORTANT:

• Regarding Spectrum boards with Texas Instruments brand upper RAM (ie: TMS4532-15NL3, TMS4532-15NL4) - these 4164s can be mixed arbritrarily with the existing upper RAM chips. IE: You can fit one to eight 4164s, just replacing the faulty chips.
• However, with Spectrum boards with OKI brand upper RAM chips (ie: OKI M3732H-20, OKI M3732L-20) all eight upper RAM chips must be replaced with 4164s and the RAM jumpers should be set to Texas Instruments type RAM.

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.

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

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.