Spectrum 128 Chips

 

Products:

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41464 / 4464  RAM Chip

41464 / 4464 RAM Chip

  • Organization: 64K x 4, Speed 120ns, 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 
  • Depending on stock, "4464" types may be supplied - these are the same RAM chips but with a different part number.
Price: £ 2.50   Add to cart. (4 in stock)
4164 Spectrum Upper RAM chip

4164 Spectrum "Upper RAM" Chip

  • 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). Any valid setting of the Spectrum RAM type jumpers is fine 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 C64, Spectrum 128 and grey 128 +2 (but not the +2A or +3)

 

Price: £ 1.50   Add to cart. (12 in stock)
74LS04 Logic IC

74LS04 Logic Inverter IC

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

Price: £ 0.75   Add to cart. (8 in stock)
74LS157 Logic IC

74LS157 IC (Texas Instruments)

  • Logic IC used in the ZX Spectrum (multiplexor chip) and in some models of Spectrum 128
Price: £ 0.80   Add to cart. (16 in stock)
78S05 5 Volt regulator for Spectrum 128 +2

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
Price: £ 0.79   Add to cart. (3 in stock)
Diagnostic ROM for Spectrum 128

Diagnostic Test ROM for the Spectrum 128 / +2

  • Simply remove the Spectrum 128's boot ROM* from its socket and replace it with this EPROM to run diagnostic tests
  • Naturally, the machine needs to have a working CPU / ULA for the diagnostic code to run but it can at least identify bad RAM etc.
  • By default, the diagnostic programmed onto the chip is Brendan Alford's "ZX Diagnostics" as this is better tailored to the Spectrum 128, but if you'd prefer my own DiagROM program just let me know.
  • * The boot rom is IC5 in the "Toastrack" Spectrum 128, IC8 in the grey +2 and IC7 in the black +2A
Price: £ 2.95   Add to cart. (9 in stock)
Switch Mode 5v Regulator - Unmodded, vertical mount (replaces 7805)

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.)
Price: £ 4.55   Add to cart. (5 in stock)
TEA2000 Video Encoder IC for Spectrum 128 +2

TEA2000 Video Encoder IC

  • As used in the Spectrum 128 +2 etc
  • Symptoms when the IC is faulty include no video, monochrome only video.
Price: £ 3.99   Add to cart. (1 in stock)
Traco 2 Amp 5 Volt switching regulator

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.
Price: £ 12.50   Add to cart. (1 in stock)