Re: supercard + hardware details

On Aug 11, 2012, at 9:01 PM, Groepaz <groepaz@gmx.net> wrote:

> howdy hackers! :)
> 
> inspired by a recent thread on lemon i have added supercard+ emulation to VICE 
> and in the process tried to find some documentation on that hardware (so i 
> dont have to guess) - with very little success. i figured out that it is 
> basically just a 2k ROM sitting at $1000, plus a 8k RAM at $6000 - and 
> implementing just that seems to make it work in VICE (grab the latest svn 
> version if you want to try). however, i understood that there is/was an 
> additional index hole sensor which is atleast supported by one of the 
> copyprograms for this card - i would be interested in any information on that 
> one, especially where it was connected to :) (that would save me from 
> disassembling the IHS-nibbler in order to find out how it works)

I have a drive with that hooked up. It's connected to the LED pin of the VIA, and is active-low with a pullup. There is a potential issue if a disk is not present and the LED is turned on. In this case, the VIA will drive 5v straight to ground.

Some info
http://c64preservation.com/c64pp/bbs/index.php?id=456
http://c64preservation.com/websvn/filedetails.php?repname=nibtools&path=%2Ftrunk%2Fihs.c&rev=540

It's in c code so it's too complicated to figure out. I'll try to rewrite it in vb and asm.  ;-)

> it seems that some people have already collected a bunch of related stuff (you 
> know who you are) back in 2006 - but unfortunately only the disk images and 
> scanned original docs are "around" on the net, no schematics or any other 
> details like that :/ (just for curiosity, i'd also like to know what exactly 
> the two "clips" coming from the card were used to, somehow i feel like they 
> werent really necessary *shrug*)

One clip is for +5v, other is for led line of VIA. I have a .txt file of the schematic but I'm traveling right now.

Nate
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