I've been trying to google up an answer, but have had no luck. What is the
difference between a 27256 and a 27C256 EPROM? Can a 27C256 EPROM be
substituted for a 27256?
Zane
der Mouse wrote:
> Second, the user interface is, at least in my experience of calculators
> and programs that can serve for similar purposes, substantially
> better-designed for the task. Part of this is the physical
> portability, but not all; a general-purpose keyboard is not the best
> input device for calculator functionality.
I think older calculators actually do a better job than many modern
calculators.
With modern calculators, I feel like I do with modern DVD player
remote controls: way too many buttons, way too many suboptions
and menus to do what I actually want.
Bit-mapped LCD screens with their ability to do menus and option
lists are part of the evil. Go back to devices before them, and you
find the core functionality (and all functionality for that matter)
directly accessible. After them, everything is on a menu on a
submenu on a ... You'd think there'd be fewer buttons with all
the menus, but you'd be wrong!
Of course I am often frustrated with modern digital scopes.
Several of the better brands actually bring out onto knobs (well,
they're probably really shaft encoders now) all the traditional
analog knobs that should be on a scope. But other brands and
lesser models put everything behind a menu. Arggghhh!
As for the perfect user interface for VCR's, I think back to the
first home units: to record a program in advance, you turn the
channel knob to the channel you want, and turn some dials to
set the timers for start and stop times. Wonderful! Here we
are, decades later, and some of the low-end VCR's are actually
approaching this functionality with one or two record buttons.
But it's still not as good!
Tim.
I have the following: SPARCstation 2 with GX card (1M mappable, rev 7),
SGI GDM-20E21 monitor (Trinitron, OEM from Sony) and 13w3 cable. Obviously
they don't work together - the pinouts are said to be slightly different
in SGI and Sun. Now, is there any easy way - cut some wires, connect
the others - to make this work?
--
If you cut off my head, what would I say? Me and my head, or me and my body?
On 14 Sep 2007 at 9:41, Chuck Guzis wrote:
> I'd appreciate it, Glen. Only the handshaking lines (IFBY, IDBY)
> need be buzzed out, I think. The tape motion commands seem to work
> just fine, but reading or writing moves the tape without the driver
> returning (i.e. stays busy). I built my cable from an Overland
> description, so I'm not completely sure that it's correct.
I buzzed out my Overland cable some time ago, and just checked the
handshake lines above against the reference you used. They match.
For reference, my cable wiring is at:
http://www.kallisti.com/~allanh/misc/overlandperteccable.html
allan
--
Allan N. Hessenflow allanh at kallisti.com
Hi, folks.
A few weeks ago, I sent out a last-minute request for
help with a large computer rescue on the east coast.
As was not entirely expected, no one was able to make
it on such short notice during the week, however all
worked out well in the end. I have some pictures of
the "haul" as
it arrived in San Jose up at www.ddp116.org .
--Bill
Hi All,
Looking for GPS chipset docs from late 80s to early 90s.
Maybe Thales, Sokkia, Javad, JRC, Trimble, Rockwell, etc?
Any responses appreciated.
Thanks,
Steve
Hello Kaypro fans,
I'd like to put a Kayplus83 rom into a Kaypro II so I can add double sided drives and have all the other nice stuff that the rom provides. It's the early model with an 81-110B1 motherboard that needs the wiring for the floppy side 2 added. The Advent Turborom manual has the wiring mods needed for side 2 access. The Kaypro II comes with a 2K eprom and the Kayplus83 is an 8K. Again the Turborom manual tells how to access a 4K rom and adding access to the A12 line should make the 8K rom work. I think that I've got that part all worked out. To make the Kayplus boot disk, you have to have a system size of 62K or smaller. My Kaypro II disk has a 64K system. When I run movcpm.com to change the system size, the program hangs. I also tried the version of movcpm that comes with the Kaypro 4 and that hangs also. So question (1) is, has anyone gotten this program to work or is there another easy way to do this? There's a blurb on the net about the Kaypro 1 movcpm not working right but I didn't see anything about the Kaypro II version. Question (2) is, should the movcpm program from another Kaypro model work on a II or are they all specific to 1 model. TIA.
Ralph
---------- Forwarded Message ----------
Subject: [Electronics_101] On this day
Date: Thursday 13 September 2007 18:05
From: Bruce <hvekybd_willtrav at bellsouth.net>
To: Electronics_101 at yahoogroups.com
From Wikipedia,
1956 <http://en.wikipedia.org/wiki/1956> - IBM
<http://en.wikipedia.org/wiki/IBM> unveiled the 305 RAMAC
<http://en.wikipedia.org/wiki/IBM_305_RAMAC> (Random Access Method of
Accounting and Control), the first commercial computer
<http://en.wikipedia.org/wiki/Computer> that used magnetic disk storage
<http://en.wikipedia.org/wiki/Hard_disk_drive>.
http://en.wikipedia.org/wiki/IBM_305_RAMAC
Though this would be interesting. Just one of the large boxes in the
picture, hold almost as much as a DVD does today. Just show how far we
have come.
-------------------------------------------------------
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
The chap I told you about earlier with the Nova 4 still needs some help
paring down his oversized collection. I will be down there tomorrow
(Saturday) to pick up the last of what I'm selling for him. There still
is a lot of early PC-related things, ham stuff, telecom crap, and
miscellanous miscelleny. Is there anyone out there who's willing to spend
this Saturday helping him clean up things? Anything that doesn't get
hauled away will otherwise get hauled away by the e-waste disposal people.
And they aren't kind to vintage stuff. So, if this sounds like your idea
of fun, email me at the below email address or my yahoo account (username:
cupricus) and we'll get things set up.
--
David Griffith
dgriffi at cs.csubak.edu
I just picked up a MicronEye camera "for IBM PC" - it came with everything
except manuals and software. "Everything" means:
The camera itself (with a ribbon cable out)
MicronEye controller box of some sort, ribbon input and RJ12 output
8-bit ISA paddle with RJ12 input.
A cardboard washer taped to a piece of paper labeled "CLOSE-UP RING"
(and original box to boot!)
The ISA paddle has an AMI S68B50P IC (a serial interface I believe) and some
74LS parts to glue it to the ISA bus. This leads me to believe that the
camera controller box itself speaks serial to the ISA board.
I know from some googling that this camera was often featured connected to
early Macintoshes, and the box it came in indicates it was available with
interfaces to Apple II, TI, TRS-80 CC, Mac, and IBM PC.
I guess I'm looking for any info on how I might obtain software for it -
really any software for any of the platforms would be helpful -- or even
just pointers as to how it might be programmed against. As well, I might be
interested in adapting it to hook up to a Mac SE or the like, as working
with pictures (especially the black-and-white pictures I believe the camera
is capable of producing) would be a bit more natural on the Mac SE than on
an age-appropriate PC.
There were some references to this device in the cctalk archives - it seems
others out there have these things. It also seemed like there were some kits
or third party producers of cameras based on the Micron ram chip, but this
is an "official" Micron product. Well, thanks for any pointers!
Mike
