Date: Wed, 25 Mar 2009 13:53:09 -0400
From: Sridhar Ayengar <ploopster at gmail.com>
Subject: Re: Free MCA stuff
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Message-ID: <49CA6F85.6020807 at gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Liam Proven wrote:
> By the way, if this is not the place, do let me know. Peter Wendt's
> MCA site seems to have gone & I don't know any other points for MCA
> collectors or fans - but if anyone does, do please let me know!
There are indeed MCA collectors on this list.
Peace... Sridhar
---------------------------------------
Also lots of them on Vintage-Computers:
http://www.vintage-computer.com/vcforum/index.phphttp://marketplace.vintage-computer.com/
In emptying the warehouse of Zebra Systems, we uncovered the original
Betamax tapes of these two shows.
I posted them on YouTube for your enjoyment.
We also uncovered a load of books, tapes, and some TS-1000/1500/ZX-81
Hardware.
We even found about 5 TS-1500 Computers that we'll be offering on eBay.
But for now, enjoy these:
http://www.youtube.com/watch?v=GtDG5cWmH8shttp://www.youtube.com/watch?v=awUonjY_jcs
Al Hartman
Hi,
Throw some ideas at me. I've got an old 4.5" B&W portable television which I
can use for something fun, such as a portable Pong game, portable TRS-80, or
whatever.
What would you like seen done with it? I'm all ears.
Alexis.
It looks like my this post from a few days ago vanished, so I'm
sending it again. My apologies if you get it twice.
I visited Mike Lee today and brought home an Apple iie and iigs.
(thanks mike) He and I were talking about lists of wanted hardware.
I think it might be useful for people to send around a list once a
month or some other interval listing what we're after and maybe what
we have to trade.
Maybe we can bring it to the meeting later this month. (is that still on?)
So I guess I'll start. :-)
Here's what I'm willing to trade:
A working amiga 2000 with a hard drive card and two floppy drives. I
can include a mouse, but not a keyboard.
I also have a Commodore 128D.
Here's what I'm after:
Commodore 64c with a 1541c, 1541-2, or 1571
A few dead (or alive) 1571s that I can hack
Amiga 500
Working Amiga 600 keyboard
Amiga 1200, dead ok.
CPU upgrades for the 2000 (040+) or any for the 1200
Really, any amiga peripheral or upgrade
A board that would allow some sort of hard drive on the iie and iigs,
so if you have something like a vulcan or scsi controller lying
around... :-)
Internal scsi devices that aren't fixed disks or tape drives, so
things like zip or jaz drives, etc.
An NEC Multisync 3D monitor
A clean IBM 5150 case I can hack
A clean IBM 5170 case I can hack
3.5" and 5.25" double density floppies I can feed to the catweasel
One of those 200-400 disk dvd changers
A smallish audio mixing board
Hi,
My Zilog S8000 Winchester Controller board carries 2 ceramic DIL16
packaged chips labeled (beside a logo) just with the two lines of text.
The chip looks like this (tried to ASCII-art the logo in front of the
text)
+----------------------------------------+
| +-------+ |
| |----- | |
\ | > ----| 6306-1J |
/ |----- | 8147 |
| | > ----| |
| +-------+ |
+----------------------------------------+
I guess the 2nd line means:
81 == 1981
47 == calendar week 47
So I wonder what 6306-1J stands for? I've not analyzed the circuit to see
if it is a PROM or something like that. It is put in a socket so I guess
it must be something (onetime?) programmable...
Maybe you can tell...
--
Oliver Lehmann
http://www.pofo.de/http://wishlist.ans-netz.de/
>
>Subject: Re: What kind of IC is this
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Wed, 31 Dec 2008 22:50:52 +0000 (GMT)
> To: cctalk at classiccmp.org
>
>> > If you're lucky, eitehr th microcontroller is old enough not to
>> > have any
>> > security features, or they're not used. In which case you remove
>> > the chip
>> > from the PCB and stick it in a suitable programmer.
>>
>> Even the original Intel 8051/8751, circa 1980, has security
>> bits. :-( There are ways to get around (at least) those, though.
>
>Yes, but IIRC the 8048 series (common in classic computer stuff) doesn't...
>
>-tony
My fractional portion of currency is that the 630x is a hitachi varient of the
680x (6800 single chip mpus). I've seen and have some them from older hard
disks and DC300 tape drives that had mechanically expired.
Allison
Ethan Dicks <ethan.dicks at gmail.com> wrote:
> On Wed, Feb 25, 2009 at 1:36 PM, F.J. Kraan <fjkraan at xs4all.nl> wrote:
>
>> Just recently I was able to read my MiniMINC (a PDT-150) floppies with an 8"
>> drive connected to an AHA1542B (capable of single density) with Dave
>> Dunfields ImageDisk.
>>
>
> Good to know. I have at least one 1542B running around, and an old
> DOS box I can use to stuff it all into.
>
> What 8" floppy did you use? I think I have a Tandon one (TM848?) I
> can borrow from a non-DEC Qbus box.
>
The drive is a NEC 1165, very flexible. It allowed me to write to a disk
with only the wrong index hole, so the MiniMINC wouldn't see it. Writing
RT-11 V3b to the right disk it booted . So writing with this setup is
also possible. The 5 1/4" to 8" interface can the one from Dave Dunfield
or the CP/M faq.
I will try it with a Catweasel one day, but the current setup seems more
common, and a MiniMINC doesn't do RX02 anyhow :-).
Would posting an URL with the images of the disks be ok?
Fred Jan
On 19 Jan, 2009, at 05:10, cctalk-request at classiccmp.org wrote:
>> The steel parts are fine, but the rest has a white material over
>> most
>> of it. I'm not sure what sort of metal it is, looks a bit dark for
>> aluminum but the white material looks similar to aluminum oxidation.
>> What's a good approach to cleaning it up?
>
> I seem to recall that the drums on 02x keypunches were brownish
> (probably an anodized coating) and silver-metallic if you scratched
> them or they wore through. I suspect that the drum is a magnesium-
> aluminum die casting.
>
I always through they were rubber covered, but from the picture it
looks like I'm wrong. My 836 (like an 026) came without its drum and I
was told that all leased machines had their drums removed and the
customer got to dispose of the rest. Maybe it was rubbish. A couple of
them have come up on eBay in the last five years and both went for
silly money which to me means there are more keypunches than drums.
Roger Holmes.
Does anyone have a pet source for:
DM74S287
DM74S571
??
Jameco has the first part number at 13.00 each (ouch) and there are some
on eBay at nearly that. The 571 seems to be pure unobtanium, unless you
count 50 hits of *&ssholes who want you to submit an RFQ and won't deal
under $250 a shot.
I need a small number (~5-6) of each.
Steve
--
Hi
My pdp-8/e has developed a nasty fault.
I have all the manuals and a scope but before delving in too deep I thought
I'd see what the 'Hive mind' knew.
Its straight forward enough of a fault. I can no longer toggle in values via
the switch register.
The address sets up ok and the switch register value appears to transfer to
core on raising DEP.
The location counter increments normally.
However going back and checking the locations shows nothing there.
It does not appear to be a problem with the core as replacing the low
address 4k with a higher one makes no difference.
Experienced PDP-8 fixers please comment.
Rod Smallwood
