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_at_bigfoot.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_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_at_bigfoot.com
>http://www.philpem.f9.co.uk/
>
Received on Fri Oct 05 2001 - 18:04:16 BST