<Has anyone ever upgraded a memory expansion card (000034, plugs into
<slot 0-5 of the CTI bus) from 64Kbit to 256Kbit chips? (256KB to 1MB)
<You can easily do this with the memory card that plugs into the
<mother board--there's even two empty jumpers waiting for stuffing.
No. the other board is also very different.
<Is it possible? If someone thinks they can do it, I'll gladly
<contribute a board for a proof-of-concept test. You keep the board
<as long as you tell me how to do it!
Yes, you will need to alter the PALs and also configure for an extra
multiplex address line. Practical, not likely.
Allison
<I am really glad to find I can use the ST-251 in my DEC
<Pro 380 instead of the Quantum Q540, since the later drive
<is rarer, older, and perhaps (in my experience) not too
<reliable. And has a smaller capacity, of course, and is
<a full-height drive.
The ST251 is well known for it's bad bearings and spindle problems. The
Q540 is known for running forever. The later know as a RD52 is very
common and very hard to kill. I have about 8 of them (all good).
Generally I will not use a st251 again... I spent to much time helping PC
support at DEC with disk failures in VAXmates (st251s aka RD32) where the
older st225 was rock solid.
<Is there a better drive (MFM) with equivalent geometry?
<(820 cyls, 6 hds, 17 sec) or maybe with 6+ heads and 820+
<cylinders (that might work, too?). Half-height would be
<nice, like the 251, because if I ever get another HD
<controller card, I can put two drives in my Pro 380 (only
<one drive per controller card, and supposedly only one
<per Pro chassis, but the 251 probably uses a lot less
<power than the Q540, so two drives should be OK).
the q540 is 8x512 (31mb)... and the 251 is 6x820 (40mb). Also the 540 is
several times faster (voice coil VS Stepper).
Allison
Why not drill a 5/16" hole through the case and spray in WD-40?
>I have a noisy ST 251 hard drive. It sounds like the bearings.
>
>Is it heretical to think I may be able to lubricate the bearings?
>They appear to be easily accessible on the bottom of the drive.
>
>Thanks,
>Dave
>
Here's another Pro 380 question. I asked it on the pdp11 newsgroups
and got no answers. Maybe you can do better here!
Has anyone ever upgraded a memory expansion card (000034, plugs into
slot 0-5 of the CTI bus) from 64Kbit to 256Kbit chips? (256KB to 1MB)
You can easily do this with the memory card that plugs into the
mother board--there's even two empty jumpers waiting for stuffing.
Is it possible? If someone thinks they can do it, I'll gladly
contribute a board for a proof-of-concept test. You keep the board
as long as you tell me how to do it!
Dave
Hi all. I'm feeling clueless at this point. I've found the CPM caldera
site and downloaded everything that looked appropriate, but I'm completely
unclear how to turn this into a kaypro boot disk. I've put a 360k PC
drive on my PC in the hopes of using it to write the disk. I've also
downloaded teledisk.
Now what?
--
Jim Strickland
jim(a)DIESPAMMERSCUMcalico.litterbox.com
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Vote Meadocrat! Bill and Opus in 2000 - Who ELSE is there?
-----------------------------------------------------------------------
Greetings, Classic Computer Fans,
I've just subscribed. I've heard about this list for a long time, and have
been recommended to check it out by a number of folks, so...here I am.
My name is Rick Bensene. I live near Portland, Oregon. Some here may know
me from my old calculator collection (which I'll shamlessly plug here:
http://www.geocities.com/SiliconValley/Lab/7510), which is my substitute
for collecting old computers. (Calculators take up less space)
I've been involved with computers since the early 1970's. I currently work
as a technologist at a large Electronic Design Automation software company.
I've always loved computers, and though I don't actively collect them,
I am hoping to live vicariously through all you folks who are active in
collecting.
I have a few older computers that I've run across, mostly as orphans.
These include a Tandy 100 (who doesn't have one of these?), a Tandy 600, a
Sun 3/50, a Sun 4/360, A couple of Tektronix 6130's, a Tektronix 4132, and
a Tektronix 4319. I worked at Tektronix for 13 years, from '77 through '90,
so
I have a particular affection for Tektronix equipment.
I've used/administrated/hacked/programmed quite a range of computers,
ranging from
a CDC Cyber 73 and later Cyber 176 at Tektronix, VAX 11/780's running both
VMS and
4BSD Unix, A Gould Powernode 9080 (interesting, all ECL machine with
dual processors), a DEC PDP8/E(OS8), a DEC RSTS system (running on
PDP 11/45), varios 11-based systems running RT-11, HP 2000C, E, F, and
ACCESS
timeshare systems, Apollo Domain OS (DN300, DN3000-series), Sun from as
early as the 68K-based VME-bus systems to latest Ultras, early HPUX machines
(700-series workstations), IBM RT workstation, IBM 360/30, early
micros (Altair, IMSAI, North Star Horizon, ProcTech SOL), Commodore PET,
TRS-80, TRS-80 Color Computer, homebrew stuff (8008, 8080 and 6809),
Tektronix 4051, Tektronix 6130/4132, Tektronix 4081, Tektronix
43xx-workstations, Alpha Micro (from the early LSI-11-based days), an old
(early 1960's) computer made by 3M
(can't remember the model number, but I'll write up some memories about it
for
the list), a SCM 7816 (strange beast, a cross between a computer and a
calculator), and of course, PC's since the original. I've programmed in
FORTRAN, COBOL, just about all variants of BASIC, C, Perl, Pascal, and in
assembly on PDP-8, PDP-11, IBM 360, Interdata 7/16, 8008, 8080, Z80, 6800,
6809, 8051, 8085, 8086, National 320xx, and 68K.
I'm looking forward to sharing memories with the list, and, as mentioned,
hearing about your memories, and all the great collector finds out there.
Best wishes to all,
Rick Bensene
Here's the list of S-100 hardware I've turned up in the last mess of boxes,
etc to be unearthed in my basement and transferred to open air storage in
my carport. This is only a partial list of what I've uncovered this
afternoon, and an extended list will be available later today.
There is other stuff, not yet inventoried, but that will be later, if at
all.
Cromemco 21-slot unterminated Motherboard in VECTOR cardcage - assembled
but never used.
MSC (later became XEBEC) 9391 5Mbps HARD DISK controller. This controller
is functional and capable of handling 16 or fewer heads at 512-byte or
256-byte sector sizes and steps the drive at 3ms per step, which was
typical back in 1980. This was the one we used most.
XCOMP HDC 2-board set. These are set up for 8" drives only and require one
write the BIOS patch or back end driver oneself.
Franklin Electric 3-UART serial I/O board
DC Hayes Micromodem-100 including documentation and software
SSM IO4 2P+2S I/O Board with documentation. No software was provided since
everyone wrote their own BIOS patches for it.
North Star Z80A CPU card
California Computer Systems 2810 Z80A CPU card, with monitor prom.
California Computer Systems 2422 FDC for both 8 & 5.25" drives, with
monitor/boot prom
California Computer Systems 4-port serial card.
California Computer Systems 64K DRAM card
Vector Graphics 64K DRAM card
Extended Processing "BURNER, I/O" board - Prom Programmer with UARTS and
PIO not installed.
Processor Technology "CUTS" cassette interface? board
BIOTECH ELECTRONICS BCT800 graphics board - uses AMI 68047 chip and 12
2114's to produce 256x192 graphics and text.
Cromemco Dazzler video graphics board pair - There are two, but only one
set of doc's and software including paper tape.
MITS Modem board - a MITS serial board with a "MODEM BD" rider.
Hi,
I have a Chinon 8-bit ISA SCSI host adapter card, which came with my old Chinon
CDS-435 SCSI-1 CD-ROM drive.
The part number printed on the card is 66201UCSEP02.
The only provided driver software is for the Chinon CD-ROM. To use other SCSI
devices with this, I need appropriate drivers.
What I want to know is, was any "universal" driver software ever made for this
card, by which I probably mean an ASPI-compliant driver? If anyone has any
idea, or a suggestion of where might be a better place to ask this question,
please tell.
BTW, Tony Duell would really like this SCSI controller; *every* chip on the
card is simple 74-series TTL. :)
-- Mark
On Thursday, February 18, 1999 4:58 AM, Joe [SMTP:rigdonj@intellistar.net]
wrote:
> At 04:09 PM 2/17/99 -0500, you wrote:
> >Michael,
> >
> >Are those belts problematic?
>
> Yes, the belts and the drive wheel for the tape drives disintegrate
with
> age.
Looking at my machine, I can see that the drive wheel for the tape drive is
pretty funky. I haven't tried to use it (don't have a cartridge) but, it'll
probably fail.
Is there a common source for drive wheels?
What about the cartridges?
Thanks,
Steve Robertson - <steverob(a)hotoffice.com>
