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VIC IEEE cart [message #300170]

Wed, 09 September 2015 18:59

Dragos
Messages: 409
Registered: January 2012

Karma: 0

Senior Member

https://www.kickstarter.com/projects/1203958506/vic-20-ieee- interface

Please take a look and help us reach our goal. We have a few more VIC projects coming in the next few months.

Thank you!

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Re: VIC IEEE cart [message #300759 is a reply to message #300170]

Fri, 18 September 2015 22:28

Anonymous

Karma:

Originally posted by: Steve Douglas

How would this be different from the V-Link?

Steve

"Dragos" <mgladson@gmail.com> wrote in message
news:7e20d303-6b00-4d23-998a-e471895a9f2d@googlegroups.com...
> https://www.kickstarter.com/projects/1203958506/vic-20-ieee- interface
>
> Please take a look and help us reach our goal. We have a few more VIC
> projects coming in the next few months.
>
> Thank you!

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Re: VIC IEEE cart [message #300760 is a reply to message #300759]

Fri, 18 September 2015 22:34

Anonymous

Karma:

Originally posted by: Steve Douglas

Sorry. Ignore my previous post. The web-page didn't fully load and I
misunderstood what you were doing.

(But why the 6522s?)

Steve

"Steve Douglas" <steven.douglas@sympaticnospamo.ca> wrote in message
news:mtih22$gup$1@dont-email.me...
> How would this be different from the V-Link?
>
> Steve
>
> "Dragos" <mgladson@gmail.com> wrote in message
> news:7e20d303-6b00-4d23-998a-e471895a9f2d@googlegroups.com...
>> https://www.kickstarter.com/projects/1203958506/vic-20-ieee- interface
>>
>> Please take a look and help us reach our goal. We have a few more VIC
>> projects coming in the next few months.
>>
>> Thank you!
>
>

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Re: VIC IEEE cart [message #300793 is a reply to message #300760]

Sat, 19 September 2015 18:44

not
Messages: 73
Registered: February 2013

Karma: 0

Member

Steve Douglas <steven.douglas@sympaticnospamo.ca> wrote:
>
> (But why the 6522s?)

Presumably because that's what the original VIC-1112 used:
http://sleepingelephant.com/denial/wiki/index.php?title=VIC- 1112_IEEE-488_interface_cartridge

--
__ __
#_ < |\| |< _#

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Re: VIC IEEE cart [message #300794 is a reply to message #300793]

Sat, 19 September 2015 19:28

Anonymous

Karma:

Originally posted by: Steve Douglas

"Computer Nerd Kev" <not@telling.you.invalid> wrote in message
news:mtkofh$ut4$1@speranza.aioe.org...
> Steve Douglas <steven.douglas@sympaticnospamo.ca> wrote:
>>
>> (But why the 6522s?)
>
> Presumably because that's what the original VIC-1112 used:
> http://sleepingelephant.com/denial/wiki/index.php?title=VIC- 1112_IEEE-488_interface_cartridge
>
> --
> __ __
> #_ < |\| |< _#

Yeah. I'm a bit surprised since it should have been possible to do it with
6520's which *should* have been cheaper. But then maybe Commodore/MOS had
tons of leftover 6522's sitting around. Something to do with a serious bug
with the shift register.

Steve

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Re: VIC IEEE cart [message #301706 is a reply to message #300794]

Sat, 03 October 2015 23:56

Dragos
Messages: 409
Registered: January 2012

Karma: 0

Senior Member

I can't speak as to why Commodore did it that way, but we did it because we are making a replica of the original :)

There are only 5 days left, so if you haven't done so yet, please support our project.

Thank you!

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Re: VIC IEEE cart [message #303228 is a reply to message #301706]

Fri, 23 October 2015 14:48

Anonymous

Karma:

Originally posted by: Steve Douglas

"Dragos" <mgladson@gmail.com> wrote in message
news:ed3f8c61-3537-47f4-90fb-83efe0edcb84@googlegroups.com...
> I can't speak as to why Commodore did it that way, but we did it because we
> are making a replica of the original :)

I get what you're trying to do. If I am feeling masochistic enough I'll look
at the ROM dump sometime to figure out what they were doing. Implementing an
IEEE port should have required just a single 6520 (or 6820/6821) for the
port itself. Dunno why they would be using a *pair* of 6522's.

For the Buscard II which had to support a Centronics printer port in
addition to the IEEE port, plus I/O lines for bank-switching the ROM, etc.
we used a 6532 RIOT and a 6520 (or equivalent).

Steve

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