3 ms·
Very important advice, especially for C64 (and same era devices).
by vardump 3y ago
Very important advice, especially for C64 (and same era devices).
- rwmj 3y agoThe ZX81 has the older RAM chip (just one!) that required an extra -5V bias voltage. A failure mode is that either the non-switch-mode power brick and/or the internal voltage regulator can fail and deliver 9V or more into this pin, with very unhappy results.