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