Re: 16 MB REU clone

From: Ruud Baltissen (
Date: 2001-08-31 08:15:14

Hallo Nick,

IMHO a 8237 is a generic DMA handler on itself. Very roughly said, the REU
is equivalent to two 8237's plus a refresh mechanism. Unfortunately the
registers don't match :(

> * Marko's REU clone

IMHO the REU is so specialised that you either have to design a full
replacement for it or use something 'simple' like GEOS-RAM.

> * Ruud's PC card

The problem with PC-Card is the huge amount of glue logic needed, not the
DMA part.

> * my core accelerator ideas and a 64HDD Ramlink equivalent....

64HDD uses a PC-motherboard as core of the desig. It sounds very logical to
me to use its onboard DMA in the first place. And if you have other
DMA-ideas, I still would use the 8237 as there is enough info available how
to interface it to your system and how to program it.
  / __|__
 / /  |_/     Groetjes, Ruud
 \ \__|_\

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