I scan at 400dpi 1bpp and save the pages using group4 compressed TIFFs
which is the maximum res the IS520 scans at.
Acrobat does a really poor job of saving JPEGs (it makes them a LOT
bigger than the originals) and I would NOT use a lossy format on any
page with only text or line art. There is a noticable loss of edge
contrast on text pages compressed as JPEGs.
a thought just hit me as to a typical failure that I have seen in floppy drive controllers. Look at the output drivers on the controller and see what the signals look like. These chips are typically open collector buffers of some kind (7438, 7406, 7407, and peripheral chips 7549x series). I have seen these chips have output problems and that could certainly create problems.
best regards, Steve Thatcher
-----Original Message-----
From: "Dwight K. Elvey" <dwight.elvey(a)amd.com>
Sent: Jun 28, 2004 12:33 PM
To: cctalk(a)classiccmp.org
Subject: Re: Floppy drive oddity? (TEC FB-503)
Hi
One other thought, check that the head positioning
system isn't sticking.
I also doubt that both drives have had some electronic
failure.
Dwight
I think I have one or two, but I can't get to them until July 12. Check
with me directly then if you haven't gotten one by then.
Joe Heck
Trash9(a)splab.cas.neu.edu
Hi,
I have a KDF-11B (that's the quad sized PDP-11/23+ CPU with onboard
serial ports and bootstrap/terminator) that's too old to know how to
boot from MSCP (e.g. RQDX/RD5x) drives. I know later versions of this
board could do that and I was planning to just upgrade the EPROMs on my
board, but all the later EPROM images are 8K bytes - my board has only
2K (2716) 24 pin EPROMS. There's no way (at least no simple way) to
install 8K 28pin EPROMs. Actually, the EPROM sockets on my board are so
close together that I don't think I could get 28 pin devices to fit even
if I did "flying leads" for the extra 4 pins.
Did the later KDF-11B boards really have 28 pin sockets? Is this
upgrade hopeless?
Does anybody have a system for disassembling and then re-assembling
these EPROMs? If I throw out all the useless bootstraps (e.g. the RK,
MRV11 ROM or DECnet boots) there ought to be room even in 2K for a DU
boot.
Bob Armstrong
One of the labs here is getting rid of the VMS grey wall (V5, I
believe). It is available free for pickup. Contact me if you are
interested.
Thanks,
John
--
John A. Dundas III
Director, Information Technology Services Infrastructure, Caltech
Mail Code: 014-81, Pasadena, CA 91125-8100
Phone: 626.395.3392 FAX: 626.449.6973
Hello, all:
I'm researching ways to interface my TI74 to a host PC. TI made a PC interface cable which I've been able to find from a third-party vendor now that IT is out of the CC40/TI74 business. He wants $94 for it. Way too much for my cheap blood.
Sensing a homebrew project in the offing, I've been doing some research. I've been able to find the software for the PC but I've found no info on the cable. The cable probably has a Hexbus chip in it, which knowing my luck is no longer available. The Hexbus specifications ("Intelligent Peripheral Bus Controller" dated 9/83) don't reveal a chip number but does indicate the fab -- LSI Logic.
Does anyone have any info on the Hexbus silicon? I've spent some time with the FTP archive on Western Horizon Tech's site but I'm coming up empty.
Thanks.
Rich
I haven't seen much PDP-11 stuff at the MIT Flea. This past
sunday, there was a robin and a rainbow, but no other systems
that I saw. There were also some vendors who had accessories
for various DEC laptops...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL,ST| email: mbg at world.std.com |
| Member of Technical Staff | megan at savaje.com |
| SavaJe Technologies, Inc. | (s/ at /@/) |
| 100 Apollo Drive | URL: http://world.std.com/~mbg/ |
| Chelmsford, MA 01824 | "pdp-11 programmer - some assembler |
| (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
On Jun 27, 13:17, Marvin Johnston wrote:
>
> I just found out about a new type of battery charger called the
> BatteryMinder that will (it is claimed) rejuvenate Lead/Acid
batteries
> that are dead due to sulphating. A friend of mine used one on a
battery
> that had been totally discharged for too long, and was able to
recover
> it.
I expect this uses some sort of high-frequency (very short duration)
high-current pulses to overcome the sulphating. The idea has been
around for a while, and it does work. See, for example,
http://www.flex.com/~kalepa/desulf.htm
which has links to a lot of information.
--
Pete Peter Turnbull
Network Manager
University of York
Fred,
As Lyle noted, I own both a 12 and a 15, and would like to
be considered for your 12 and 15 tapes. (I currently only
have a couple 15 tapes and no 12 tapes.)
I have contributed material to Al on a regular basis for
scanning or read-in for his extensive bitsavers.org site.
(David Gesswein has also read in 15 tapes for the site.)
Thanks,
- Robert
robert.garner(a)mindspring.com
On Sunday, June 27, 2004, at 09:15 AM, Lyle Bickley wrote:
> From: Lyle Bickley <lbickley(a)bickleywest.com>
> Date: Sun Jun 27, 2004 9:14:02 AM US/Pacific
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk(a)classiccmp.org>, "Fred N. van Kempen" <waltje(a)pdp11.nl>
> Cc: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk(a)classiccmp.org>, Al Kossow <aek(a)spies.com>
> Subject: Re: PDP-9, -12, -15 paper tapes found
>
>
> Robert Garner has both a PDP-12 and PDP-15 and he's local (San Jose
> area). I
> suspect he'd want them for sure.
>
> Lyle
>
> On Sunday 27 June 2004 08:57, Fred N. van Kempen wrote:
>> Hi All,
>>
>>> You might want to bring them to the US next week and loan
>>> them to Al Kossow so he can archive them.
>>
>> OK, will do. This will actually NOT make KLM scream at me, for
>> once :) Since I do not "do" anything with these systems, are
>> there any PDP-9, -12 and/or -15 collectors who would want to
>> take these, after Al copies them?
>>
>> Cheers,
>>
>> Fred
>
> --
> Lyle Bickley
> Bickley Consulting West Inc.
> http://bickleywest.com
> "Black holes are where God is dividing by zero"
>
>
