> >> Are you sure about that? The 5100 doesn't support floppy drives. And
> I've
> >> never heard of third-party drives (that would need IMFs, too) for the
> 5100.
> >
> > $3100 is about what IBM charged for a fully loaded 5150. (PC)
> > THAT is not a 5100! $3100 for a 5100 would have been a bargain.
>
> We are neither talking about the 5150, nor about $3100 but $31,000 for a
> 5100 (see above). Or did I miss something?
>
There was a third-party floppy drive for the IBM 5100 :-)
Or at least there as something that was sold in this way. Here is its
brochure:
http://www.bitsavers.org/pdf/sykes/brochures/Sykes_Comm-Stor_5100_Brochure.…
Note that it "plugs directly into the Serial I/O Adapter of the IBM 5100
with no hardware or software changes". So it's a serial-port connected
floppy drive that talks to the 5100 in a format that it likes.
(What is an IMF?)
--Tom
On Tue, Sep 21, 2021 at 10:18 AM Al Kossow via cctalk
<cctalk(a)classiccmp.org> wrote:
>
> On 9/21/21 9:58 AM, Chris Zach via cctalk wrote:
> > How the hell did I miss *that*? Cool beans device, I've never heard of a VS100. Was it in a Rainbow sized box or a Pro/350 box?
>
> Smaller. I have access to one to take pictures and dump the firmware
Reviving a year old thread, did anyone get around to dumping the
VAXstation 100 firmware?
I don't see it where I looked here:
http://www.bitsavers.org/pdf/dec/vax/vaxstation100/http://www.bitsavers.org/bits/DEC/
Hello vintage computing fans across the country and around the globe
(that's right - we're international!) The 17th Vintage Computer
Festival Midwest is coming up in just two weeks! The hotel is sold out
(months ago!), the tables are all booked (and then some!), now all we
need is YOU!
View over 80 exhibits and vendors, witness more talks than we've ever
had before and observe in person the Fabulous VCFMW Auction!
And the show is FREE, to boot! All you need to do to participate and
receive the full benefit of retrocomputing in the Midwest is...show
up.
Find out more at vcfmw.org!
[September 10-11, 2022 in Elmhurst, IL, right outside of Chicago]
I've got a printer for the IBM 5100 that I would like to sell. I can
bring it to VCFMW, but only if it is sold ahead of time (too heavy to
comfortably bring on spec.) Best reasonable offer.
Marvin
Continuing my exploration of my old stuff pile I'm starting to work on
my Sun 386i systems. Old, no doubt but still there.
First step would be finding a monitor for them. The video cards I have
are the monochrome one, the CGI3 and a CGI5 board. For the color
monitors the cable I have goes to the RGBSync and of course to the
keyboard/mouse combination.
Question: Is there an adapter that can turn the Sun's output to HDMI or
VGA for a more modern monitor?
C
Im working on an update to Wikipedia on floppy disk drive controllers
there is a nice section on WD but nothing on Intel/NEC
Anyone know the history of how the NEC µPD765 and the Intel 8272 became
compatible devices?
AFAICT it was IBM's August 1981 adoption of the NEC µPD765 in the PC that
drove the industry to standardize on the device.
The earliest dates I can find for the two devices are:
Jan 1981
8272 listed in Intel catalog (not in 1979 catalog)
1979
µPD765 listed in NEC catalog
<http://www.bitsavers.org/components/nec/_dataBooks/1979_NEC_Microcomputer_C
atalog.pdf>
Dec 1978
µPD765 Data Sheet
<http://www.bitsavers.org/components/nec/_dataSheets/uPD765_Data_Sheet_Dec78
.pdf>
As described in the 1978 data sheet the NEC device was 8-inch FD compatible
and of course the PC used 5¼-inch drives but I suspect the differences could
be worked around
It may well be that they were compatible in previous versions (µPD372 and
8271)
Any recollections and links would be appreciated
Tom
Hello vintage computing fans across the country and around the globe
(that's right - we're international!) The 17th Vintage Computer
Festival Midwest is coming up in just two weeks! The hotel is sold out
(months ago!), the tables are all booked (and then some!), now all we
need is YOU!
View over 80 exhibits and vendors, witness more talks than we've ever
had before and observe in person the Fabulous VCFMW Auction!
And the show is FREE, to boot! All you need to do to participate and
receive the full benefit of retrocomputing in the Midwest is...show
up.
Find out more at vcfmw.org!
[September 10-11, 2022 in Elmhurst, IL, right outside of Chicago]
I got this message and in wrong country. They said ok to post to lists where
local people might be able to pick up.
I have 19 rolls of teletype asr 33 paper, and 24 rolls of tape white 1
inch, and various brochures for PDP 8 TSS, and PDP 11 Infos.and 1 box of
2000 sheets of paper fan fold. I am currently in Fareham Hampshire, but
will soon be on my way to Germany in a few days. Please let me know.
They would prefer one person takes all.
andrew_baust(a)hotmail.com
Pictures here http://www.pdp8online.com/ftp/misc/supplies/
jim stephens <jwsmail(a)jwsss.com> wrote:
> Sad day when AOL changed to CDs and you then had to make
> coasters or trash them.
My wife and our neighbor use them as reflectors to scare birds away from
her garden. We finally ran out of the AOL CDs and are now working on my
backlog of MSDN CDs. I keep them stacked on a 1/2" wooden dowel, and
still have a roughly 4' high stack. That should last us for a few years.
Alan Frisbie
On 9/1/22 18:43, Mike Katz wrote:
> Taking my memory back to the early 1980's and the Western Digital floppy
> disk controller chip family (177X single density and 179X double
> density). I wrote the 6809 drivers for Gimix Flex. The controller chip
> used the index pulse for sector zero position and for timing out a
> failed read or write command. I don't recall if that controller chip
> family could handle hard sectoring (one hole per sector) or not.
All WD and NEC floppy controllers use the index hole for formatting as
Fred mentioned. Further, I believe that three passes of the index hole
while attempting to read or write gets you "Sector not found" if the
address ID isn't detected. See datasheet and app notes for details.
No WD or NEC floppy controller handles hard-sectored recording schemes.
HOWEVER:
A few years back, I was sent a bunch of 8" HS disks that were really
puzzling--the sector ID address headers didn't line up with the sector
hole timing. In fact, they were WAY off.
It turns out that some 8" drives can be set to separate the sector holes
from the index hole (separate output pins for index and sector). Doing
so, gives you what amounts to a soft-sectored floppy, regardless of what
the physical object is. I know that I used a Siemens FDD-200 drive
jumpered accordingly to read them.
Good times.
--Chuck
