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IBM PC XT/370 Maintenance Guide
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=== 370PC-M (Memory Card) === * Carries 512 KB dual-ported DRAM. * Communicates with the 370PC-P via the dedicated rear-edge connector. * Adds 384 KB to the XT host's 256 KB to give 640 KB total host RAM. * '''DRAMs on the M card''' are standard 64K ร 1 DRAM packages of the era; failed DRAMs are replaceable if the failure is identified to a specific chip.
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