I have a few tubes of ST-branded M27C256B UV-erasable EPROM chips. All of
these fail to program starting at 0x200 until 0x27F. At 0x200, 0x00 is
written, then until 0x27F, the bytes are 0xFF. What would cause this?
Can it be fixed by an extra-long time in the eraser? Should I just break
out the hammer?
At least I know the programmer is capable of programming a TI-branded
27c256 and 29c256 flash chips. Might there be a bug in the programming
FWIW, I'm using a Minipro TL855. Linux software is available at Github:
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?
Q: What is the most annoying thing in e-mail?
I believe the KVA is increased because of the extra memory card. I have a
5100 with 0.4 and another with 0.336. The 0.4 has an extra memory card and
is BASIC and APL as opposed to just BASIC.
The printed 5100 badging on the front is not consistent but sometimes if it
doesn't have it printed on the front, it's on a silver metallic emblem
embedded in the top cover. If the 5100 badging is printed on the front, it
may or may not have the silver metallic badge on the top cover. I have a
top emblem model and a top emblem-less model yet both have the 5100 badging
printed on the front. If you look at other photos on the net, you will see
others with no front printed badging. This particular one had no front
badging but has the emblem in the top cover and I think this is normal.
I'm not sure which one is earlier/later but I would imagine that is why
there is a difference.
I can't explain the 5110/5100 difference on the bottom.
Hope this helps.
On Sat, Feb 3, 2018 at 6:15 PM, Wayne Smith via cctalk <
cctalk at classiccmp.org> wrote:
> Has anyone noted this listing of what the seller is calling an "IBM
> 5100" on Ebay?
> While it is listed as a 5100, it lacks the 5100 badging on the front
> center panel (to the right of the power switch). In addition, the
> indicia on the bottom
> indicates both models 5100 and 5110, and the KVA is listed at 0.4
> whereas 5100s are 0.336. Compare the typical indicia on the bottom:
> The serial number is in the 5100 format of 10-1XXXX, but this unit has
> the highest serial number I have seen on a 5100 (10-15687).
> I am guessing that this is some sort of transitional version or
> perhaps a 5110 "prototype".
> Any thoughts?
Has anyone noted this listing of what the seller is calling an "IBM
5100" on Ebay?
While it is listed as a 5100, it lacks the 5100 badging on the front
center panel (to the right of the power switch). In addition, the
indicia on the bottom
indicates both models 5100 and 5110, and the KVA is listed at 0.4
whereas 5100s are 0.336. Compare the typical indicia on the bottom:
The serial number is in the 5100 format of 10-1XXXX, but this unit has
the highest serial number I have seen on a 5100 (10-15687).
I am guessing that this is some sort of transitional version or
perhaps a 5110 "prototype".
I finally got a system running again and hooked up my first
AK6DN RX02 Emulator.? Worked, up to a point.? I can boot
>from it and read and write to it.? However, every once once
and a while after doing a bunch of accesses the Green LED
stays on and the system freezes.? Sometimes I can get back
out of it with Control-C but sometimes it is locked? up so tight
I have to reboot to get out of it.
Anybody else see this behavior?
I need to read a couple of Signetics 82S215 bipolar PROMs with my old Data
IO 29B / Unipak 2B. But it needs a 351B-068 adapter.
Does anyone has information regarding this adapter?
I did find an old post in DATA_IO_EPROM at groups.io mailinglist that a man
named Alfred Marin had boards. I even found his email but it bounced.
Any other pointers in this subject?
> From: Lars Brinkhoff
> notes on his progress are here:
Ah, that sounds pretty good. The ability to re-create source, given the FASL,
will really help.
> In 1982 MIT licensed Macsyma to Symbolics, but also made it available
> to the US Department of Energy.
I wasn't involved with this, but my recollection from dribs and drabs I
overheard was that DoE got a copy because they'd been the funding agency for
a lot of the work - i.e. MIT didn't just give a copy to DoE, it was a
> From: Lars Brinkhoff
> Right, we haven't found sources for everything in Macsyma.
Ow. How much, very roughly, is missing (if you happen to know) - 5%, 50%?
> I'd say we're lucky to have it running at all
I started accessing BBSs back in the early 70s with a 300 baud modem.
>From there it went to 1200; 2400; 9600; 28.8K and 56Kilobaud. All on
dialup! Now at 5 Mbits/sec. here in Ontario. An American friend has
250Mb/s download. Yikes! The classic computer era taught us patience
didn?t it? BTW, one had to have a private phone line not a party line
for a modem to work. Making our hobby more expensive!
On the business-side of computing: Xerox sold 50.1% of its business to
Fujifilm, Japan. Xerox Parc was a seminal institution in early classic
computing era: Mouse and graphics input for instance.