DecServer 550 chassis
holm at freibergnet.de
Thu Oct 22 12:31:10 CDT 2015
Holm Tiffe wrote:
> Johnny Billquist wrote:
> > On 2015-10-19 23:11, jwsmobile wrote:
> > >
> > >
> > >On 10/19/2015 12:39 PM, Johnny Billquist wrote:
> > >>Well, you did ask for "thoughts in the conversion", so I gave you
> > >>mine. Sorry if you felt they were unhelpful. I just thought the
> > >>"conversion" was basically a no-work. Programming proms is something I
> > >>have spent more time than I can count on, and is so routine that I
> > >>don't even think about it.
> > >>
> > >I didn't mean that in disrespect. The contents of what I posted was on
> > >the page and I basically needed the binaries and needed some direction
> > >as to which went where. I appreciate you taking time to reply, but am
> > >coming from a lot less capability than you have. I do a lot of
> > >computing and the like, but I've purposely not kept up with eprom
> > >technology to the point that i can't reliably swear I can program them
> > >right now.
> > >
> > >There are only so many things one can keep up with and eproms were not
> > >one that was cheap to follow, and I was more into EE type devices anyway.
> > Well, EPROMs are getting sortof old fashioned nowadays.
> > >I may need a favor by swapping you some of my eproms (I have a 12" x 12"
> > >x 12" box of pulls) maybe to get you to make me a set for my board.
> > Unfortunately all of my stuff in Sweden, while I nowadays live in
> > Switzerland. So I could only possibly help out next summer.
> > But I probably would have some 27256 around.
> > >I've pulled out probably 500 and returned them to the original owner and
> > >owe him more. but I do probably have a lot of the 27xx proms.
> > >
> > >Do you think these are 27C or just straight 27 type eproms, and if so
> > >what speeds? That is what I need to know too.
> > I normally don't care about that. The difference is in how you program
> > them, and there are more variations than that. Fortunately my programmer
> > knows a whole bunch of them, and also can autodetect the different models.
> > But once they are programmed, the actual pins are the same, so speed is
> > the only possible issue. But I think most of them are 125ns, which is
> > fast enough anyway.
> > I replaced the firmware in some 11/93 boards a few years ago. But I
> > think I just reused the existing proms that time.
> > But I don't have any 11/53 boards, so I can't do that here.
> > Johnny
> I can do a look later this day. I've done exatly this some years before,
> and the KDJ11 that is working now as plain CPU isn't in a machine
> currently so I have it handy.
> As far as I remember I've used 27C256 Proms and the contents of the
> previous ones are on Pete's archive since they where newer then the
> images he had.
> I've updated the memory from 512K to 1,5Mb too...
Looked at my KDJ11 Board today (sorry for the delay). I have twp peaces
27128A on this board.
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