Path: utzoo!utgpu!radio!ziebmef!ross
From: ross@ziebmef.uucp (Ross Ridge)
Newsgroups: comp.sys.cbm
Subject: Re: Burst Mode on C-64 ?
Keywords: burst mode
Message-ID: <1988May27.175829.5648@ziebmef.uucp>
Date: 27 May 88 21:58:27 GMT
References: <4110@mtgzz.UUCP> <4146@killer.UUCP>
Reply-To: ross@ziebmef.UUCP (Ross Ridge)
Distribution: na
Organization: Ziebmef Public Access BBS/Unix
Lines: 39

In article <4146@killer.UUCP> elg@killer.UUCP (Eric Green) writes:
>in article <4110@mtgzz.UUCP>, bjh@mtgzz.UUCP (XMRN40000[tls]-b.j.hudson) says:
>> I have a 1581 3.5" Drive to use with a C-64. [for Amiga transfers]
>> It is capable of fast and burstmode operation with a C-128.
>> Has anyone seen the Burst Mode U4 ROM replacement for the C-64 from
>> Chip-level Design ?  I thought hardware modifications were required ?
>> If it is kernal changes only, might GEOS include C-64 burst-mode in
>> their yet-to-be-released 1581 support ?        .....BJ
>
>To do true fast and burst mode operations, you need hardware modifications. In
>particular, you need a 6526, and you need bus buffer chips for turnaround of
>the 6526 shift register. You can grab the 6526 shift register pins off of the
>user port, and you need one data line for the turnaround. Then you need a
>replacement ROM to drive this hardware... actually, the software is the
>hardest part 
 
On a local BBS we had a discussion about burst mode on the 64. We thought the
biggest problem would be be the hardware modifications, but our goal was to
be able to do it through software only. The CIA's (6526) serial port *could*
be emulated through software (side note: the 64 can go as high ar 4800 baud
or 7200 half-duplex if you completely re-write the RS232 routines) however
burst mode used serial line that wasn't connected on the 64...
 
>I think there is someone who REALLY has burst mode, out there on the market at
>this very moment... but, don't ask me who or where. With the dwindling sales
>and availability of the C-64, I'm beginning to believe the people who say "The
>64 is dying! The 64 is dying!".
 
Actualy supposedly Commodore sold one million 64's last year, although not as
high as at the peak of microcomputer boom, not too shaby either (can anybody
else claim higher unit sales?). And availablity of Commodore products has
always been a problem.


-- 
 l/                  {uunet!mnetor!lsuc,utgpu}!ncrcan!ziebmef!ross      //
[OO]                or just call me Ross for short...                   [oo]
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 db                     6502 assembly forever!                          //