5 Oct
2001
5 Oct
'01
11:04 a.m.
The 8271 is a poor choice as it does not do MFM (double density).
Either use 8272 or the 1770 you have. The 1770 does not overclock
reliably.
Allison
-----Original Message-----
From: Philip Pemberton <philpem(a)bigfoot.com>
To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org>
Date: Friday, October 05, 2001 12:20 PM
Subject: 6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd
Hi,
I'm building myself a 6502-based single-board computer, with the aim
of
running it off a 4.8V NiMH or NiCad battery pack. But
I've got a
problem. I
need a programming language for it. Aparrently there
were many BASIC
interpreters sold for the Synertek SYM-1 (aka SY-VIM-1), MOS KIM-1 and
Rockwell AIM-65. Anyone know what happened to the companies that
produced
these? Ideally I'd like the source code for a 6502
BASIC interpreter,
but
binary code would be OK too. The SBC will communicate
via a small LCD
panel,
RS232 (so I can hook it up to a "dumb
terminal") and will have a
hexadecimal
keypad and an optional hard drive, too. Anyone care to
make any
suggestions
(or submit some code)?
BTW, I also need some info on the Intel 8271 disk controller - I've got
two
of these little devils and Intel's datasheet makes
absolutely no sense
at
all. I've also got a Western Digital WD1770-PH
00-02 that I might be
able to
use instead. First of all, which is the better
controller? The 8271 or
the
1770? Also, is it possible to overclock a 1770 or an
8271 like you can a
1772?
I'd love some schematics and/or some source code. I really don't fancy
disassembling Acorn's 8271 DFS and Watford Electronics' 1770 DFS...
Thanks.
--
Phil.
philpem(a)bigfoot.com
http://www.philpem.f9.co.uk/