VSII/GPX joy (and minor annoyance)

[Arno Kletzander]

Antonio Carlini wrote:
> Arno Kletzander wrote:
> > Hmm. One half of the base board does however have circuitry connected
> > to those pads that are just linked by grant continuity traces on the
> > second half (and the 4-plane memory boards), so I figured it might
> > actually be doing something useful with it. Haven't studied the
> > technical description yet...
> 
> The QVSS and QDSS will be passing the grant signals along otherwise
> boards further down the bus will have issues. 

That is the very point I am disputing - in order to just _pass along_ the
signals, you only need a _trace_ from the pad where the signal enters the
board to the one where it leaves again. This is what the video memory boards do.

OTOH, if the pads carrying the grant signals in and out aren't just shorted together but _connected to the electronics_, as they are on the video master board, chances are the board is _actually using_, i.e. monitoring or (more likely in this case) influencing those signals at some time.

> Don't let me stop you trading up to a TK70, but FWIW I never had an
> issue with TK50s. I prefer TK70s but that's because I can get about
> three times as much on them!

Getting media might end up being more of a problem in both cases, I assume...

ISTR that a TK70 should work in place of a TK50, but I assume I won't get the full capacity without the corresponding controller; coming to think of it, I also have use for a TK50 anyway because I have that TK50-Z SCSI enclosure (minus drive) at home and I found out that a TK70's front bezel won't fit into the panel cut-out.

-- 
Arno Kletzander
Stud. Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de

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