Added a couple of things to my collection today:
Compaq 386 Lunchbox (comes up with a 1790 (iirc) Disk 0 error) -- $35
Data General One -- $20
2 SE/30 logic boards, new in Apple service boxes -- $10 (probably put these
on ebay.)
HP DDS Dat drive -- $25
HP 75D with 9114 disk drive -- $25
My questions concern this last one. The computer itself is about 5" deep by
10" wide by about an inch thick. It has room for three expansion modules
(has two: "Barcode Reader" and "HP 75 I/O") and four connectors on the rear.
Two are in and out to the 9114, one is power (I'm pretty sure) but I'm not
sure about the last. Perhaps input for the barcode wand?
Anyway, if anyone has *any* info about it, I'd love to hear from you. I
tried HP's site and all I got was that it's discontinued, not supported, and
replaced by a newer handheld or something. It was described as a "notebook
BASIC Computer", btw.
Thanks in advance!
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
sinasohn(a)ricochet.net that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.crl.com/~sinasohn/
At 09:11 AM 11/7/97 -0500, you wrote:
>I 'd like to commend and thank Matt Pritchard for shipping the Hard Drive
I'll second that! Thanks! (P.S., mine came in on Friday.)
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
sinasohn(a)ricochet.net that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.crl.com/~sinasohn/
<I thought that a HD disk would simply have a denser coating of magnetic
<material applied evenly over the entire surface of the disk. I don't
<see why this should cause problems for a DD drive. However, a few
<questions come to mind. Is the magnetic coating of a different
Corcivity, the amount of field needed to chage the magnetic state. the
HD media requires different field strength and it affects the ability to
record on the other media. Simply put the head, media and rotation rate
are specific and altering the parameters of one munge the other.
<Since some of the software for my "old" (first generation PC) computers
<is on 5 1/4" disks of dubious condition, I would like to make copies
<onto new disks. Since HD disks are still readily available and cheap, I
<thought this would be an ideal way to do so.
Reading from one and writing to another is ok bt the drive used should
match the media.
<My question is: can I plug a Double Density drive into the same
<connector in my modern PC and use it for my old disks? I know I will
<have to change my BIOS setting, but is there anything else I need to
<consider?
Maybe, depends on the controller installed and the version of dos.
Acopy of upgrading and repairing PCs <QUE publications> would be helpful
to you on this and other PC related problems.
Allison
i need some help with an applecolor rgb monitor if anyone can.
does anyone know any way of testing this monitor? i have one in the
silver-gray colour that matches my mac IIcx yet, i cannot seem to get any
video on it. i have tried using both a laser128 and a //c's rgb output into
the monitor, but the only thing i can get is a deep blue screen with stable
vertical lines with the //c, and a moving blue bar with the laser128 although
they both can do rgb output and i was using the same cable. when i tested the
monitor with my mac cx which has a 1 bit mono card, i did get video, but was
difficult to read, and i got double images of the desktop. i've already tried
every control accessable on the monitor too. unlike my vga monitors, this one
does not produce a raster screen when no video cable is connected. is there
anything else i can try short of round-filing the monitor?
david
Hi,
Well, I'm hoping someone can give me some advice on this, but thanks to
extensive use of DejaNews I've a bad feeling I know what the problem is.
Here is the boot sequence.
{Asks to select Language}
{Asks US or UK}
Performin normal system tests.
7..6..5..4..3..
Tests completed
Loading system software.
2..
?54 RETRY
2..
When it's coming up it sounds like the HD spins up, and then as soon as it
hits the "Loading system software" it sounds like it spins down.
Hi there
While searching for information on the Laser Computer(Video Technology
Computer Ltd) I came across your letters
I have a laser laptop LT321 which is in desprate nead of memory
If you have any information regarding the computer or the memory it would
be most helpful
Ian (uk)
In a message dated 97-11-08 09:01:35 EST, Alan Richards put forth:
>
> Does anyone have any ideas about this machine, specificaly I would like
to
> know how to break into the BASIC. On the Apple, I press CRTL and reset,
but
> this doesn't work on the Laser.
I have just the regular 128 and it basically should work and act the same as
a //c. The machine was supposedly 99% apple compatible, but I needed the 1%
compatibility when aol supported the apple ][ and it wouldnt work with my
laser! <control>-<reset> should work, but i've noticed you cannot do it too
quick. let go of the control key first, then reset. to get into the builtin
"control panel" to setup your ports, press <control>+"open apple"+<p> i
think that's what it is.
david
Hi All,
Despite the fact I haven't been able to get my VAXstation to boot, I
decided to take an inventory of what is in it. I've come up with one board
I'm not 100% sure as to what it is, it's a memory board, but what size?
The board in question is a "M7608-AP". I know what an -AA (2Mb) or -BA
(4Mb) are, but what is a -AP board? Oh, and yes I'm sure it said -AP not
-AA :^)
Thanks,
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)ix.netcom.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| For Empire of the Petal Throne and Traveller Role Playing, |
| see http://www.dragonfire.net/~healyzh/ |
| For the collecting of Classic Computers with info on them. |
| see http://www.dragonfire.net/~healyzh/museum.html |
Found this on the web, thought someone would be interested
Regards,
--
Hans B. Pufal : <mailto:hansp@digiweb.com>
Comprehensive Computer Catalogue : <http://www.digiweb.com/~hansp/ccc/>
_-_-__-___--_-____-_--_-_-____--_---_-_---_--__--_--_--____---_--_--__--_
<It had no RAM, clock, or anything, it was simply an ALU wired to 2 banks o
<4 switches, and a rotary switch configured to select one of the 8 or 16
<operations supported by the ALU. If I'd built it I'm sure I would've tired
<of 4 bit boolean operations pretty quickly.
<
<Kevin
But the step from that to a rudimentary computer was fairly short. What
was missing was the sequential(or microprogrammed) logic to get from
switches to Fetch an instruction from memory and Execute it. The simple
machine in Byte had the microprogrammed part of the system to do that
albeit crudely. What was significant was how few parts it took to do
that.
To make a point. The DEC RX01 and RX02 disk systems use a crude
microprogrammed computer to do all the disk formatting and control work.
The RX01 more specifically is easier to understand as the biggest chips
used are bipolar proms, 7489 (16x4 rams) and a 74181 alu chip. Its logic
contained on one board of 16"x6" and if the RX01 specific logic were left
out it would be 2/3rds that. It could be programmed to behave differently
and I have used the basic logic design to create other similar high speed
specialized controllers. the later rx02 is similar but they use the 2901
bit slice with is really a 16x4 ram, ALU and gating logic in one chip.
Oh, the alu is identical to the 74181. FYI: the RX01 controller has 5
basic microinstructions as it's all that were needed to implement the
needed programming. General purpose no, it didn't need to be It had to
be fast enough to run bits at 500khz.
Needless to say that Byte article I refer to would be of interest as it's
simple enough to explain and build with current components. I plan to dig
for it but I am not sure I still have it.
the latter 1985 article is more ambitious and most would have trouble
fabricating it as it's a fairly large number of chips (60-100 ttl).
The design would have to be revamped to use more common chips and then
simulated/breadboarded and tested for logic/timing errors. A PCboard
for it would be several cards and likely several hundred dollars for
the set in small quantity. Then there is programming as it's a unique
machine with no existant programming available. That means cross
assembler would be required to get initial code going for a basic monitor
program. the article is a worthwhile read as it does explain how a computer
is devloped and composed. It's in Byte September (VOL 10, number9) and
October (vol 10, number 10) and they are available from BYTE at $3.00 each.
I have no connection to byte other than having those on the shelf and
handy. I've used them to present on computer design.
Allison
