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Remote Memory Access Interface Between Two Personal Computers

IP.com Disclosure Number: IPCOM000060028D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Kemp, JW Tuttle, DP Wieland, MA [+details]

Abstract

The Remote Memory Access (RMA) interface shown above consists of a PC-XT I/O bus Driver/Receiver Card (DRC) 10, Interconnecting cable, and the PC-16 I/O bus Direct Memory Access Card (DMAC) 11. The figure is a block diagram of the RMA Interface. The DRC 10 attaches to the PC-XT I/O and drives the parallel address bus and data bus across the interconnecting cable to the DMAC 11. The DRC controls the DMAC, a first party DMA master on the PC-16 bus. The function of the RMA link is to provide a high speed (at least 1 megabyte/min) bidirectional data path between an 8-bit I/O bus of Personal Computer (PC-XT) and a 16-bit bus of (PC-16). The RMA interface has two modes of operation. One is a low speed (PIO/DMA) mode which allows the PC-XT to request individual DMA cycles from the PC-16 and monitor status conditions of DMAC.