We had a similar problem when I was at IBM and we were developing a
follow on to the PC/AT (it never shipped). We had a bunch of
prototypes in the lab running tests with stepper HDDs (rather than
voice coils) We kept having disk errors (failure to find track 0) when
running tests.
It took us a w
Hi all,
Back in the early 70's I was an operator on an IBM 360/40 with 4
tapedrives. Nobody could understand that sometimes a tape transfer would
stop saying "end of tape", mainly around 3 PM, when not called for. It
was mainly one specific drive, but its two neighbours, one on each side,
cou
Oh, they're just 4116's then. That's simple, as someone pointed out on
Discord Jameco sells them so I just bought 10 and 10 low profile sockets.
The other alternative was pulling apart one of my MSV11-D boards from
the Q-Bus world but that would be sad... :-)
On 10/26/20 8:31 PM, Chris Zach via cctalk wrote:
Ok, so I'm now troubleshooting the memory parity errors in the MS11-L
memory. And yes, there are bit errors in the memory. I wrote a simple
program to check the first 64k bank and I've found errors in bit 2 but
not everywhere but on a predictabl
Ok, so I'm now troubleshooting the memory parity errors in the MS11-L
memory. And yes, there are bit errors in the memory. I wrote a simple
program to check the first 64k bank and I've found errors in bit 2 but
not everywhere but on a predictable pattern of addresses. Interesting,
possible that
Thanks for that Al. Never thought about humidity and mag tapes as
only time I used to backup data to 9 track tapes was in Vancouver
where humidity always high. Also used Time Shoppa's and Kevin
McGuigan's drives to extract data from those tapes in
Vancouver. Doubt I'll be copying any more of
Hello Al,
Am 26.10.2020 um 17:01 schrieb Al Kossow via cctalk :
> There is a minimum RH specified for tape, but "tape heads depend on the
> moisture from the air" ??
First of all, my experiences are from ancient audio reel-to-reel tape. So maybe
I’m wrong. Also add the fact that „screwing up“
On Sun, Oct 25, 2020 at 9:01 PM Chris Zach via cctalk
wrote:
>
> Isn't UNIBUS simple! Sorry, Q-Bus doesn't need a terminator, doesn't
> have weird DMA stuff, and if you really need to put a card on a
> particular side you can always grab a DLV11 (everyone has these) and use
> it as a spacer. Anyo
> On 10/25/2020 11:58 AM Guy N. via cctalk wrote:
>
Interesting! Just over the last few days I have been going through
old issues of ETI (Electronics Today International, the original Australian
version) from 1985/86 that included a series of articles on the R65F11 and
R65F12. I have long w
Rockwell also had an RSC-FORTH Kernel and development environment ROM set for
the R6501Q, which is a similar 6502-based processor meant for embedded
applications.
http://www.smallestplcoftheworld.org/RSC-FORTH_User%27s_Manual.pdf
Here's the RSC-FORTH manual, which covers the different types of
Looking to complete a period-correct DEC workstation? Missing the right
mouse? Have I got a deal for you!
Digital 3-button mouse part number 30-5-01 rev. C02. PS/2
connector, ball mechanism (not one of those fancy new things with the
red light on the bottom).
Free for actual cost of shippi
This popped up on the radar tonight (on mine anyway).
IBM System 360 30 Console animated mainframe CPU Console 360/30
https://www.ebay.com/itm/324348449949
A bit pricey, but pretty.
Luckily I landed one of the boards to run Larry W's emulation of the
2030 , which will be satisfying for
me.
http://mnembler.com/computers_mini_stories.html
"George Dragner always wore a belt with a metal dragon buckle. He was a colorful character known for pissing off management. His most
famous act was tossing a chair through the window at a customer site. The customer refused to believe that the
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