We get back to the Sinclair ZX-81s. A keyboard is replaced, the tape input connectors are cleaned and reflowed and lo-and-behold it loads games now! We test the 64KB memory expansion and play a 16K game.
JunethackMore detailed look at the ZX-81 memory map00:11 Leader
00:30 Recap
02:34 Keyboard replacement
07:05 Checking out a wonky power connector
09:12 Loading a 1K game
10:20 Reassembling the machine
12:20 Loading a 1K game on the second machine
12:46 Memotech Memopak 64K memory expansion
15:38 ZX-81 memory map
17:36 Configuring the memory expansion
19:41 Configuring the ZX-81 ROM BASIC memory
23:22 Testing the memory expansion
24:55 Playing a 16K game
26:55 Wrap-up
28:07 Credits
29:28 Bonus content: more power connector wonkiness