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Spectrum 128 Chips
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41464 RAM Chip
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
This chip will replace:
* 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
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.