6 Oct
2001
6 Oct
'01
9:32 a.m.
The DIL parts are supposed to exist, but I've never seen them. Perhaps the lack
of pins for crystal oscillators explains that.
Dick
----- Original Message -----
From: "Tony Duell" <ard(a)p850ug1.demon.co.uk>
To: <classiccmp(a)classiccmp.org>
Sent: Saturday, October 06, 2001 2:14 PM
Subject: Re: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd
>
> If you use the WD37C65, (available, yet today, via Rochester Electronics)
though
you do have to
use two crystals to cover the range of needed clocks, it is
You only need 1 of the 2 crystals if you want the 300kbps data rate.
That's what you get if you read normal 5.25" disks in a HD disk drive
(which rotates at 360rpm, not 300 rpm like most other drives).
The other crystal (which is always needed) gives you the 250kbps and
500kbps data rates which may be all you need.
IIRC the PLCC part has built-in oscillator circuits (just add the
crystals) and the DIL part needs TTL-level clocks (there arent' enough
pins to have 2 for each crystal on the DIL package), but I might be
thinking of some other chip.
-tony