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
Someone on Fesse Bouc just found a sealed box of SS/SD 8" floppies in
their garage.
Most FB types are too young to know 8" disks existed, of course.
Someone suggested punching a notch in them and using both sides.
Was that even possible on 8" disks?
(TBH single-sided actually-floppy floppies are before my time and I
never used 'em. When they were on low-end American 8-bit home
computers, this impecunious young Brit couldn't afford floppy drives
at all. By the time I could, 5.25" DS/DD was the cheapest drive and
cheapest media.)
--
Liam Proven ~ Profile: https://about.me/liamproven
Email: lproven(a)cix.co.uk ~ gMail/gTalk/FB: lproven(a)gmail.com
Twitter/LinkedIn: lproven ~ Skype: liamproven
UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053
