5 Feb
2007
5 Feb
'07
9:10 p.m.
----- Original Message -----
From: "Jim Leonard" <trixter at oldskool.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Monday, February 05, 2007 11:47 PM
Subject: Re: TRS-80 Model I
Roger Merchberger wrote:
The Tandy 1000 HX and EX had DMA if you had the memory upgrade card
installed (also needed if you wanted to add any plus cards), but not stock.
The last two - the HX & EX, were all-in-one
units with the keyboard
built-into the system unit, one floppy, minimal and specialized
expansion - maybe those didn't have DMA???
Internally they had DMA as well (there were hard drive expansions for
them at some point).
I'm pretty sure you're thinking of the PCjr, which has the distinction
of being the only IBM PC compatible that is *slower* than the original
machine due to slow RAM (first 128K) and lack of DMA. Later upgrades
added faster RAM and DMA, but on stock delivery, it was slower.
But we love our bastard children :-)
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