Microsoft KB Archive/28917

Memory Plus Description PSS ID Number: Q28917 Article last modified on 11-22-1994 PSS database name: HARDWARE

1.00 MS-DOS

= SUMMARY =

The Microsoft MACH 20 Memory Plus is a memory-enhancement board available for all IBM PCs, PC, or compatible computers equipped with a MACH 20 board. Memory Plus connects easily to the MACH 20 board through a 16-bit data bus and does not require an additional expansion slot. Memory Plus comes with 512K of onboard memory. This memory is expandable beyond the conventional 640K to 3.5 MB and conforms to the latest Lotus-Intel-Microsoft Expanded Memory Specifications (LIM/EMS). These technical specifications are as follows:

RAM

 * 512K RAM standard; expandable up to 3.5 MB
 * 1 wait state at 8 MHz
 * Backfill of popular memory configurations to 640K, performed by hardware during boot

Configurations
Total Number Chip Chip Chip Memory of Chips Size Speed Type —— ——– —- —– —- 512K 18 256 kilobits 150 nanoseconds DRAM 1 MB 36 256 kilobits 150 nanoseconds DRAM 1.5 MB 54 256 kilobits 150 nanoseconds DRAM 2 MB 18 1 megabit 100 nanoseconds DRAM 3.5 MB 54 256 kilobits 150 nanoseconds DRAM and 18 1 megabit 100 nanoseconds DRAM

EMS

 * 32 alternate register sets (30 available)
 * Bank-switching into entire 1 MB

KBCategory: kbhw KBSubcategory: Additional reference words: 1.0 1.00 noupd

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================================================================ Copyright Microsoft Corporation 1994.