8-bit micro MMU's

[Chuck Guzis]

> Date: Tue, 29 Jan 2008 01:19:35 -0500
> From: Dave McGuire 

>    A slight diversion here...What is wretched about the 8202?  I ask 
> because I got ahold of a few not long ago (and some 8203s) and was 
> considering putting something together with them to play with.

As I recall, the timing, on chip-to-chip samples was all over the 
place making it a headache to design a manufacturable product.  The 
second-generation 8203 is much better in that respect.  I'd recommend 
that you skip the 8202.

If it's a one-off and you have more than one sample, it may not 
matter.

I thought it interesting that IBM avoided the problem of a DRAM 
controller altogether on the PC and dedicated a channel of the 8237 
DMA controller to serve as refresh generator.  You'dve thought that 
Intel would have made them a great deal on one.

Cheers,
Chuck