Just picked-up a nice Bell & Howell computer. It's
very nice, and seems to work fine, but I don't know
much about the history behind it.
I know it's an Apple II Plus in disguise, sold to
schools by B&H. Is there anything interesting about it
or it's history?
Thanks!
Steve.
__________________________________
Do you Yahoo!?
New Yahoo! Photos - easier uploading and sharing.
http://photos.yahoo.com/
what do people
recommend for scanning in terms of resolution, format etc?
--
400 - 600 dpi b&w Group 4 FAX encoded TIFFs
these can be converted simply to pdf's with Eric Smith's
"tumble" program.
I've scanned 1 million + pages with this encoding using
a Ricoh IS520 double-sided 30ppm scanner at 400dpi. All
of the documents at bitsavers.com/pdf are processed this
way now.
Pages with graphics are scanned as 100-200dpi JPEGS but
normally the text requires a bit of contrast enhancement
on these pages. tumble handles mixed JPEG and TIFF
documents.
On Dec 15, 22:42, Jerome H. Fine wrote:
> >Pete Turnbull wrote:
>
> > Yes, because that's about the only useful distinction -- the speed
> > increase brought by PMI memory is more than the clock difference
> > between 15MHz and 18MHz -- and of course if placed after the CPU,
even
> > a PMI-capable memory board operates as normal Q-Bus memory.
>
> Approximate speed increase from M8190-AB (KDJ11-BB)
> with normal DEC memory (obviously below the CPU) vs
> M8190-AE (KDJ11-BF) with DEC PMI memory above
> the CPU was about 33%. An assembly which took about
> 4.5 minutes was reduced to about 3 minutes. I can't recall
> the exact numbers or exactly what I tried, but the test with
> the M8190-AB and the PMI memory above the CPU took
> about 23% less time than 4.5 minutes. I then tried the
> M8190-AE and normal DEC memory below the CPU
> and that took about 10% less time than 4.5 minutes. When
> the PMI memory was below the M8190-AE, that also
> took about 10% less than the 4.5 minutes.
So, taking the M8190-AB as baseline, and doing some arithmetic:
M8190-AB M8190-AE
15MHz 18MHz
non-PMI 1.0 1.1
PMI memory 1.3 1.5
18MHz is 1.2 times 15MHz, so it seems other operations on the bus
are reducing the effect of the clock speed increase. Of course, that
might also be due to using memory with a different cycle time. Still,
it's clear that the PMI makes a bigger difference than the clock speed,
going from 15MHz to 18MHz.
--
Pete Peter Turnbull
Network Manager
University of York
I need the manual to the IBM L40SX laptop. Willing to pay in Dollars (US,
Canadian, or Australia), Euros, Rupees, Pounds, Iraqi Dinars, or Shekels.
Hopefully you prefer Dollars (US).
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
>The Macintosh Portable also has this feature. Does anyone know of, or
>have, an actual locking mechanism that was made for the Macintosh
>Portable?
Does the portable's lock slot differ from either the Mac desktop units
(like the Plus) or the laptop units (which some had a small hole that a
keylock would fit into).
I do have the lock clamps for a Mac Plus, and I believe it was the same
as for any other desktop mac. Its a little metal bar that slips into the
lock slot and snaps behind the tabs built into the case so it can't be
removed. Then a cable slides thru the hole in the bar and is wrapped
around and locked to any secure object.
I used it to secure one of my Mac Pluses when my wife (then GF) borrowed
one while in college.
IF this is the same as for the Portable, then I have at least one lock
plate still (it should still be in the keyboard that was used with the
plus), but I'm sure I no longer have any packaging or documentation for
it, and I may or may not still have additional plates or the cable.
-chris
<http://www.mythtech.net>
>The reason I'm stuck using it is my Star Commander workstation is a little
>486 laptop with no (working) Ethernet card, so disk images have to get
>sneaker-netted to and from the dual G4.
Can it use a parallel to ethernet adaptor? I've got two from Xircom, and
I bought them at a local computer flea market for $5.00 each (well, I
bought one, my brother bought the other, and then gave it to me when he
stopped using it).
-chris
<http://www.mythtech.net>
If you hadn't noticed, most (all?) Macintosh models from the first through
the Mac IIs had a slot on the back for inserting a security mechanism so
that the computer could be chained to a desk.
The Macintosh Portable also has this feature. Does anyone know of, or
have, an actual locking mechanism that was made for the Macintosh
Portable?
Actual examples or documentation thereof will suffice if you've got them.
Thanks!
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
Just a note to say that the 1103 is what put Intel on the map
(IMHO). It's a 1Kx1 memory and was also used in the Alto. It
features an external "precharge" pin that was eliminated in later
versions of the chip. Count your blessings.
Hi all,
I recently grabbed a VT-132 with a non working PSU unit. Is there someone
on the list who has a schematic of the PSU or has a surplus one for sale/trade?
I'm also looking for the manual but a good photocopy will do too.
Thanks,
Ed
--
My newest baby arrived today. I was recently contacted by a kind
gentleman who was looking for a new home for some equipment. I was
offered a NeXTstation, NeXT printer, N4000A monitor (clear and bright),
SyQuest MO drive and a ton of software and documentation for free, just
pay shipping. It just arrived, all in original NeXT boxes with the
original invoice/packing slip from NeXT attached. The invoice is dated
1992 and shows a cost of $7995.00. It's now a second owner system. I
can't wait to get it home and unpack it!
James
