ZX Spectrum 128K "Toastrack" IC Replacements and SMD Soldering (Part 2)

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Last time we figured out the problems in this Sinclair ZX Spectrum 128K Toastrack, but we had to replace multiple chips to get it working. Today we're going back and we're going to try to figure out suitable replacements for the ZX8401/PCF1306P, the ULA, and the ROM.

As part of that, we dig into what exactly the ZX8401 does and the details of the ZX Spectrum memory addressing, and then we proceed to do some SMD soldering (and desoldering!) for a replacement board.

Chapters:
00:00 Intro
00:19 Patreon announcement
00:45 ZX8401
01:41 Memory addressing in the ZX Spectrum
05:27 Building a ZX8401 SMD replacement
09:36 Diagnosing faulty ZX8401 replacement
13:20 SMD desoldering
15:02 ULA problems
18:26 RGB Scart cable
20:24 Comparing and replacing the EPROM
23:54 Conclusion

José Leandro Novellón PCG1306P design

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#zxspectrum #repair #sinclair