Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software

Allison ajp166 at bellatlantic.net
Fri Dec 9 15:13:35 CST 2005


>
>Subject: Re: Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software
>   From: ard at p850ug1.demon.co.uk (Tony Duell)
>   Date: Fri, 09 Dec 2005 18:28:07 +0000 (GMT)
>     To: cctalk at classiccmp.org
>
>> It was quite somethig to take an 8088, 8284(clock gen), 8205 (aka74138),
>> 8755, 8155 and have a complete 16bitter in 5 or so chips.  However, the 
>
>IIRC there was a Circuit Cellar article in Byte for a 5-chip machine 
>using the 8088. The other chips were, IIRC, the clock generator, 8155 
>(RAM + I/O), 8355 (ROM + I/O) and an Intel RAM chip with multiplexed 
>address/data buses. The address decoding was done by just connecting the 
>chip enables to the high-order address lines...

Yes, that circuit is straight out of the intel appnote.

>Well, I've read the datasbook, I've seen it in use, but have never 
>designed with it. What's the problem? It always struck me as a lot nicer 
>than the 8237 + page registers that IBM used in the PC

think about it.  It's a microprocessor with a flat 20bit address and nothing
like the 8088.  In some respects is nicer. I had to write a simple debugger 
for it using the host for the IO.  Very ugly and hard to control.

Allison



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