An interesting 3 hours on PBS last night:
- 'Steve Jobs - One Last Thing': No description necessary.
- 'Long Distance Warrior': McGowan/MCI's David & Goliath battle with AT&T
and disastrous merger with Worldcom.
- 'Digital Man/Digital World': Ken Olsen/DEC's growth and ultimate decline.
(No doubt everyone here except myself had already seen this one ;-)
Interesting comparison of the different styles and personalities of three
men who profoundly influenced the tech world of today and their companies.
Thoroughly enjoyed it.
m
> Lastly, I wonder if there might be some kind of checksum check to prevent tampering. Is there a common way this is handled in 8085 world? Or is it entirely programmer dependent?
One approach that <may> be doable for you is if you have a good ROM with a known checksum, make your changes then calculate the difference between the new and the original checksum and make another change somewhere innocuous to bring the checksum back to the original value. "Innocuous" may be the trick - perhaps some text string you don't care about, copyright notice etc. or maybe there is an empty area in the EPROM you could stick a byte.
Richard Sheppard
On Tue, 4/17/18, Eric Smith via cctalk <cctalk at classiccmp.org> wrote:
> On Mon, Apr 16, 2018 at 7:29 PM, Chuck Guzis via cctalk <cctalk at classiccmp.org> wrote:
>> Disassembly is never lots of fun,
>
> Some of us might disagree.
> But then, some of us might be masochists.
I was just thinking the same thing. This whole discussion
has taken me back to fond memories of writing a 68000
disassembler in AWK (long story).
BLS
> From: Paul Birkel
> the blinky-lights controller panel top-dead-center :->.
Yeah, that's a TC08.
I actually have one of those inlays, it's the only original inlay I have. It
was the model for the large run of blank inlays (black backing with the holes
on the back, but nothing on the front) I just had made. At the moment, it's
sitting in my indicator panel stand with little bits of tape stuck to it:
http://ana-3.lcs.mit.edu/~jnc/tech/QSIC/jpg/PanelMounting.jpghttp://ana-3.lcs.mit.edu/~jnc/tech/QSIC/jpg/DasBlinken2F.jpg
so it can be an inlay for the RKV12. If anyone needs a TC08 inlay, I'd be
happy to trade it for any other inlay (as long as I have one original for
engineering purposes).
Sigh, need to get back to the inlays and take the next step with them!
Dave B and I got derailed trying to find/fix a flaky on the QSIC - on my
prototype, it would occasionally get NXM's running the RK random exerciser I
wrote. I was trying to figure out what the problem was, and I got tired of
the prototype sticking out in my way:
http://ana-3.lcs.mit.edu/~jnc/tech/jpg/tmp/JNCQSIC.jpg
(with the FPGA daughter-board on top, even with short cables, it has to be on
an extender), so I rotated the QBUS chassis 90 degrees so the QSIC was on
top, and took the opportunity to re-order the boards. Bad mistake! Now the
problem has gone away and I can't re-create it!
Noel
> From: Eric Smith
> But then, some of us might be masochists.
I think pretty much by definition if you're into vintage computers, you have
to be a masochist... :-)
Noel
Hi folks,
I know this is a wild long shot, but just in case...
Does anybody have a copy of the source code for the NI Ethernet driver for the AT&T 3B2? AT&T distributed it, but I have never seen a copy in the wild. The package name was "nisrc", if that helps.
If I can't find it, I'll have to reverse engineer the binary. Won't that be fun!
-Seth
--
Seth Morabito
web at loomcom.com
Does anyone know where Motorola's current production chips are described?
http://www.motorola.com/General/prodport.html only partially works and
search is entirely broken because http://search.motorola.com no longer
exists.
--
David Griffith
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
I'm pondering upgrading the CPU of a Pacccomm Tiny-2 Mk2 radio packet
controller from a 6Mhz Z80 processor and SIO to 10Mhz parts. My problem
is that the parts already in it appear to be NMOS. The family is still
being made by Zilog, but for 10Mhz parts, CMOS is all they have. Can I
just drop in CMOS, change out the crystal/oscillator and have things work
as expected?
Here's what are fitted to my TNC.
Z84C00BB6
Z80BCPU
29125
Z8440BB1
Z80BSIO-O
29014
--
David Griffith
dave at 661.org
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
