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An interesting related fact is that the 48k Sinclair Spectrum also used 8 32kBit DRAMs (in addition to 8 16kBit chips). However, these were not the special mod
by johndoe0815 6y ago
An interesting related fact is that the 48k Sinclair Spectrum also used 8 32kBit DRAMs (in addition to 8 16kBit chips).
However, these were not the special modules used in the Apple 3, but 64kBit DRAMs which had a fault in one half of the matrix, such as TI TMS4532-20 or OKI M3732.
The defective half of the chip was simply disabled.
- klelatti 6y agoIf I've understood correctly the one half was disabled on the Spectrum (i.e. the Spectrum would never try to access the defective part and the half that wasn't working had to be identified by Sinclair) - so they really were defective chips, in contrast to chips where the manufacturer deals with the defect.
- Zardoz84 6y agosome people had lucky (not defective) or replaced it for good 64 kBit drama and add a switch to change between the lower and upper bank. (my father did this)