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=== RAM === RAM is '''9 bits wide (8 data + 1 parity)'''. A parity error on read triggers the 8085's '''TRAP''' input and halts the system. RAM is '''not''' on the motherboard โ it lives on '''one or two memory daughter cards''' connected via 36-pin card-edge connectors. The DRAMs are '''Texas Instruments TMS4132''' โ a factory-piggybacked variant of the TMS4116 that stacks two TMS4116-class dies in a single package. This is often mistaken for IBM-soldered redundancy; in fact, it is a TI factory part. Each TMS4132 contains '''two stacked dies''' and failure of either die kills the byte.<ref>TMS4132 datasheet, minuszerodegrees.net mirror.</ref> Official RAM configurations: '''32 / 64 / 96 / 128 KB'''. Memory boards came in 32 KB and 64 KB sizes; combinations are 32 (32+none), 64 (32+32 or 64+none), 96 (64+32), 128 (64+64). '''The system will not boot without a board in the "base" socket.'''
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