128k RAM expansion
BOM list:
1 x HM628128
1 x GAL20V8
1 x 74HCT273
2 x 100nF ceramic capacitor (C2, C3)
1 x 330R resistor (R1)
1 x 1k resistor (R2)
2 x LED diode (D1, D2)
1 x switch (SW1)
A single wire mod to your ZX Spectrum 48k is required to disable the 32k upper RAM
For Issue 2/3/4 connect pin 5 on IC23 (74LS32) to pin 14 (+5V)
For Issue 6 connect pin 35 on IC27 (ZX8401) to pin 40 (+5V)
Designed by Jiří Veleba
128k RAM expansion
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
PCBWay is not responsible
for issues caused by unsuitable parameter selections.
For more important ordering information, please refer to
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