-----------Original Message:
Date: Sat, 12 Jan 2008 23:51:21 +0000
From: Ethan Dicks <ethan.dicks at usap.gov>
Subject: PET power supply questions
Hi, all,
I've been collecting various classic bits to work on over the winter,
including a pre-CTRC 32K PET board (2001-N/3032) and a Static PET
board. I don't have any cases or accessories, but I do have a C2N232,
a single bare keyboard, and a C=Key converter enroute. For video, I
was planning on trying that ancient XOR circuit to make composite video
>from sync and video, and feed that to an old Panasonic mono CRT I saved
>from scrap. What I'm lacking at this point is a power supply.
Obviously, I'm unlikely to find a suitable mains transformer, so I was
going to cobble up some form of switcher that puts out enough of the
right voltages to make this all work. Poring over the schematics for
the 2001-N board on zimmers.net (e.g. 320349-9.gif), I'm guessing that
the onboard regulator circuit is pumping out +5VDC at over 5A, +12VDC
at a couple of amps, and a miniscule amount of -5VDC. I'm not running
a real tape drive, so I'm not as worried about the +9VDC unreg.
Does anyone have any reasonable estimates or real-world measurements
for the current draw on the various supply lines? Has anyone out there
ever gotten a PET to run from externally regulated DC?
Thanks,
-ethan
------------Reply:
I haven't done it but, since I've also got a board and lower case w/kbd & cassette
but no monitor or PS xfmr, it's also on my to-do-someday list to put it together
with a small switching supply and composite monitor.
I don't have a DRAM 2001N, and it's a little awkward to check the current on
my 8032, but an SRAM 2001-8 identical to the one I sent you (but with chips;-)
draws 2.8A on the unregulated 8.5V which feeds 4 LM305s, so the actual 5V
draw would probably be slightly less. I'd think that any common +5/+12/-5
supply with >5A on the 5V would do just fine for both your boards, and if
you don't need the cassette a single 5V supply would do the SRAM version.
mike
This is precisely the reason I unsubscribed from cctalk and subscribed to cctech. Yet, crap like this still gets through. Suck.
-----Original Message-----
>From: jpero at sympatico.ca
>Sent: Jan 8, 2008 12:53 PM
>To: cctalk at classiccmp.org
>Subject: youtube movie of making a vacuum triode.
>
>This is in french but the video is priceless! 17 minutes long.
>Worth taking your favorite drink and take a seat.
>
>http://blog.makezine.com/archive/2008/01/make_your_own_vaccum_tube.ht
>ml
>
>Cheers, Wizard
> -----Original Message-----
> From: Andrew Lynch [mailto:lynchaj at yahoo.com]
> Sent: Sunday, January 13, 2008 1:31 PM
> To: 'cctalk at classiccmp.org'
> Subject: Wavemate Bullet / Wave Mate Bullet
>
> Hi,
>
> Does anyone have a WaveMate Bullet machines? Does it work?
>
> It appears to be a single board CP/M computer with two 5.25" floppy disk
> drives.
>
> Thanks!
>
> Andrew Lynch
[AJL>]
I think I'll clarify my post a bit... :-)
I recently bought what I thought was an external dual 5.25" drive on Ebay
but it turned out to be a Wave Mate Bullet single board computer. It came
with two floppy drives and it *appears* to be in working order. However, I
do not have boot disks to verify if it works or not.
If anyone has any boot disks for this system, please reply here or contact
me off list. The system uses soft sector disks so all I need is disk images
we can make with ImageDisk. Probably, you don't even need a working machine
since the disk drives are 96tpi floppy drives which can be read on a PC with
a 1.2 MB HD floppy disk drive.
Thanks in advance for any help!
Andrew Lynch
PS, here is the manual at bitsavers (Thanks Modem7):
http://bitsavers.org/pdf/wavemate/Wave_Mate_Bullet_SBC.pdf
I seem to have my share of Terminals that have bad keyboard parts.
3 that I'm working now have the same type of Keyboard. These
are Hazeltine 1500 and ADM 3As. These have an molded base
with fingers that stick up and a second square piece that slide into the base
and makes and breaks the finger contact. It also has a square opening in the
top for the key cap. So when someone drops a heavy object on the the key board
this intermediate piece cracks in the corners and binds in the base.
What I would like to find is a doner type of system that does not have
any value so I can rob the middle piece.. (typewiter) ???
Tandy (Archer) sold a Alpha-Numrtic keyboard that said it was made
for the TI 99/4 computer. It used the same switch type keyboard.
- Jerry
Jerry Wright
g-wright at att.net
Hi,
I'm working on putting a 2.88 Sony floppy on a NeXT Cube that was
upgraded to a 68040. So it has a floppy connection on the mother board.
I have the pin-outs for the Next but not for the Floppy. Since the power
comes through the interface cable and so does other 2.88 specific
signals, I dont want to take a chance on trial by Error........ Looks
like there was a ever changing standard on the 2.88 interface.
Can't seem to find any searches that help.
Drive is a Sony MP-F40W-25
Thanks, Jerry
Jerry Wright
g-wright at att.net
>
>Subject: Re: Backing up VMS
> From: Scott Quinn <compoobah at valleyimplants.com>
> Date: Sun, 13 Jan 2008 08:34:51 -0800
> To: cctalk at classiccmp.org
>
>
>On Jan 13, 2008, at 1:05 AM, Dave Dunfield wrote:
>
>>
>>>> My immediate concern is that I'd like to make a full backup
>>>> of the VMS 5.5 on the VLC, and also attempt restoring it to
>>>> another drive.
>>
>>> The VLC is simply SCSI based, isn't it? I wouldn't bother with
>>> doing a
>>> file-based backup, just because the SCSI drive will probably be
>>> "quite
>>> small" compared to today's drives. Just attach it to some other box
>>> and do a block-copy of the whole drive. That'll create a file of eg.
>>> 4GB in size with everything in it, including partitioning and all the
>>> file system(s). Simple to create, simple to restore to this or an
>>> identical drive.
>>
>> I've already done that - I put the drive from the VLC as an external
>> drive on the 3100 running NETBSD and dd'd it into an image file - but
>> my goal is to be able to survive a drive failure, and possibly also
>> move it to a larger drive. The original drive in question is an RZ23,
>> which is a 100M DEC labled Conner drive - I have three other similar
>> drives, two labled RZ23 and one Conner that are "really close" but
>> not exactly the same - apparently there were slightly different
>> variations and versions.
>>
>>> You'd probably do a file-based backup additionally to be able to
>>> restore to a different medium, though.
>>
>> Exactly. If I understand it correctly, an image backup should restore
>> to any drive, and is the best way to insure that I can rebuild the
>> system in the future.
>
>Why not write out a BACKUP tape with standalone BACKUP at the front
>so you can do a restore install? Only read about it being done on
>TKxx/TZxx drives, but it would be worth looking into, as it is the
>"official" DEC way to build a restorable backup (and is how they
>shipped the VMS tape distros) (haven't read too much about it because
>I don't have any CompacTape media right now).
You can do that to a SCSI drive or any media large enough and recongnized
by the system.
That means TKxx, TZxx, RDxx (RD54 at 150mb is large enough for preV6 VMS),
Any of the RZ drives large enough (I use RZ55s and 56s).
Allison
Hi,
Does anyone have a WaveMate Bullet machines? Does it work?
It appears to be a single board CP/M computer with two 5.25" floppy disk
drives.
Thanks!
Andrew Lynch
Just in case anyome else fixes TM100s...
As is well-known, the track0 sensor in these drives is a microswitch.
It's a standard V?-size one, but iwth a low operating force. One of mine
failed (in an HP9836, if it matters), and I've found that RS (not Radio
Shack, but http://www.rswww.com) 472-8005 is a perfect replacement. It's
got the same connecitons (simply move the wires over tag-to-tag), and
fits the original brackets with no problems.
-tony
> From: M H Stein <dm561 at torfree.net>
> Interestingly, Andrew Lynch apparently got a different version of the GFR
> (-149 IIRC) to work on his Vector with HS disks, whereas my -159 never
> goes ready at all with HS disks.
I was trying to oversimplify a bit on my reply; Teac drives across
any single product line have a tremendous potential for variability.
The last thing in the world I wanted was for someone to hunt down a
set of FD-55GFR drives and report back that they didn't work. The
same variability is present in 3.5" Teac drives--the 235HFs come in
many varieties; some offer many options; others offer next to none.
Undocumented jumpers and pads on drive PCBs are even wilder in
assortment and presence/absence.
I've had pretty good luck with Mitsubishi and NEC floppy drives
manufactured for the Japanese market (PC9801-style systems). As the
floppy format is based on an 8" model and doesn't change much across
physical formats, the drives themselves tend to behave when pressed
into use in 8" applications. They can be tough to find on this side
of the Pacific, however.
Generally, the later a drive is manufactured, the more "smarts" are
used in its drive control logic--and the less it will be suited for
non-PC use. I was surprised to find that there's a Toshiba 3.5"
floppy (ca. 1996) that senses the data rate on HD diskettes and
automatically changes its spindle speed. You can read, write and
format 1440 KB on it and read and write 1232 KB, much like many USB
and IDE floppy drives. The idea probably was that there were still a
lot of DOS-V format floppies hanging around Japan and wouldn't it be
nice to be able to read and write them on a "generic" PC...
Heaven only knows what the drive would do with some nonstandard data
rate or modulation.
Hope this helps,
Chuck
