What's a WD2793A chip?

From: Richard Erlacher <edick_at_idcomm.com>
Date: Fri Feb 4 21:22:11 2000

Be careful what you assume about this chip.

As I wrote before, the external lowpass filter is different for different
data rates, so if you want to use both 5-1/4" and 8" drives, (and the 3-1/2"
ones that look like 8") then you need two lowpass filters. These can be
hooked up very simply today as there are analog multiplexors with on the
order of 1 ohm of on-resistance, though back then it was necessary to use
relatively costly low-on-resistance D-mos switches. I very much prefer the
digital approach, which, then, was the only real alternative.

Dick


-----Original Message-----
From: Dwight Elvey <elvey_at_hal.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
Date: Friday, February 04, 2000 6:23 PM
Subject: Re: What's a WD2793A chip?


>Allison J Parent <allisonp_at_world.std.com> wrote:
>>
>> <In going through and sorting my piles of classic ICs, I ran across this
Wes
>> <Digital WD2793A chip. What is it?
>>
>> Take a 1793 and put some of the stuff needed to make it useful on the
die,
>> call it 2793. Basically it's a 1793 with data sep and precomp logic
built
>> on.
>
>Hi
> Anyhow, if anyone wants the schematic for the iSBX card
>I have with the 2793, I can trace it out for someone.
>Just let me know. It has all of about 4 chips.
>Dwight
>
Received on Fri Feb 04 2000 - 21:22:11 GMT