WULA 81 is a replacement ULA (Uncommitted Logic Array) for ZX81 and Sinclair. If your ZX81 does not display an image or has intermittent video faults, the WULA 81 solves the problem with a new chip that exactly reproduces the function of the original ULA.
Main features
| Compatibility | ZX81, Sinclair ZX81, Timex 1000, Timex 1500, ZX81 clones |
|---|---|
| Function | Direct replacement of the original ULA |
| Component | New ULA chip (not recycled) |
| Pinout | Identical to the original ZX81 ULA |
Compatibility
- Original Sinclair ZX81
- Timex 1000 and Timex 1500
- Wilco81 and ZX81 clones
- Any ZX81 that uses the standard 40-pin ULA
How to use it
- Remove the original ULA from your ZX81 carefully using an IC extractor
- Insert the WULA 81 into the socket, aligning the notch with that of the socket
- Verify that all the pins are correctly inserted
- Turn on the ZX81 and check that the image appears correctly
- If the screen shows the blinking cursor, the WULA 81 is working perfectly
Included
- 1x WULA 81 (replacement ULA chip)
Diagnosis: If your ZX81 shows a blank screen, black with lines, or intermittent image, the ULA is probably damaged. The WULA 81 is the direct solution without the need to search for vintage chips in second-hand markets.
Tip: Before replacing the ULA, check that the problem is not in the video cable connection or the power supply. A damaged ULA is the most common cause of video faults in old ZX81s.
