20 Jun
2005
20 Jun
'05
3:42 p.m.
I picked up more DEC parts from Thom today including several M8350
cards. All I can find out about them is that they're "KA8E posibus
interface". Can anyone provide more details?
BTW does anyone have any suggestions about cards that I should be
looking for?
Joe
20 Jun
20 Jun
3:52 p.m.
Joe R. wrote:
I picked up more DEC parts from Thom today
including several M8350
cards. All I can find out about them is that they're "KA8E posibus
interface". Can anyone provide more details?
BTW does anyone have any suggestions about cards that I should be
looking for?
Well, I could use an M9312 terminator with boot ROMs....
Doc
4:14 p.m.
On 6/20/05, Joe R. <rigdonj at cfl.rr.com> wrote:
I picked up more DEC parts from Thom today
including several M8350
cards. All I can find out about them is that they're "KA8E posibus
interface". Can anyone provide more details?
Those provide a 'Posibus' interface to OMNIBUS machines. Posibus is a
peripheral bus found on all PDP-8/L and some PDP-8/i machines. There
aren't too many Posibus peripherals (the DF-32D comes to mind), but if
you had one on your -8/L, you could migrate it to your -8/e with the
M8350.
You would need a set of 3 Berg-40-to-DEC-backplane cables - BC08J? to
connect the M8350 to the Posibus device.
I wouldn't throw it away, but you probabably don't have any immediate
need for it, unless you have some uncommon late-1960s peripherals.
-ethan
4:20 p.m.
On 6/20/05, Joe R. <rigdonj at cfl.rr.com> wrote:
BTW does anyone have any suggestions about cards
that I should be
looking for?
Forgot to answer this - MSC-8 hex MOS memory cards are handy - if they
are 1/2 populated with 4Kbit chips, they are 16KW, fully populated
with 4Kbit chips they are 32KW. If you happen to find the same card
with 16Kbit (4116) chips, that's a whopping 128KW. You'll need a KT8A
to address it, another late model card of limited use - RTS/8 used it,
and I am pretty sure there was a RAM disk driver for OS/8 to use the
upper 96KW as storage.
As Al said, the RL8A is handy, as are RX8Es. Beyond that, most quad
OMNIBUS card sets are handy and useful, especially the RK8E.
It kind of depends on what you want to do with a PDP-8, but memory and
disk are among the more necessary options for a base machine, followed
by printer and communications interfaces.
-ethan
4:46 p.m.
Forgot to answer this - MSC-8 hex MOS memory cards are
handy - if they
are 1/2 populated with 4Kbit chips, they are 16KW, fully populated
with 4Kbit chips they are 32KW. If you happen to find the same card
with 16Kbit (4116) chips, that's a whopping 128KW. You'll need a KT8A
to address it, another late model card of limited use - RTS/8 used it,
and I am pretty sure there was a RAM disk driver for OS/8 to use the
upper 96KW as storage.
Those have been selling on eBay recently.
As Al said, the RL8A is handy, as are RX8Es. Beyond
that, most quad
OMNIBUS card sets are handy and useful, especially the RK8E.
In addition, I'd list the RX8E, since the drives are so common, and are
relatively trouble free.
Vince
4:43 p.m.
I picked up more DEC parts from Thom today
including several M8350
cards. All I can find out about them is that they're "KA8E posibus
interface". Can anyone provide more details?
Those are useful :-). They interface Omnibus machines to the older, simpler
Posibus, allowing you to hook up the older Posibus peripherals. (I also
intend to generate a few new Posibus device controllers :-).)
I don't think there's a need for more than one per machine, though.
Consider them trade goods (or send the extras to me :-)).
BTW does anyone have any suggestions about cards
that I should be
looking for?
Practically anything Omnibus M8xx or M8xxx is useful. The possible
exception would be the 8/E CPU itself, which are very common. Stuff that is
always in short supply are peripheral controllers (and the peripherals), the
3-board quad-height core, and front panels (the programmer's panel, for
instance).
Vince
8:42 p.m.
vrs declared on Monday 20 June 2005 06:43 pm:
You must mean relative to other PDP-8 stuff, because I've never seen ANY
pdp-8 boards laying around anywhere, and they would probably fetch a
decent price on eBay..
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
BTW does
anyone have any suggestions about cards that I should be
looking for?
Practically anything Omnibus M8xx or M8xxx is useful. The possible
exception would be the 8/E CPU itself, which are very common.
9 p.m.
On 6/20/05, Patrick Finnegan <pat at computer-refuge.org> wrote:
You must mean relative to other PDP-8 stuff, because
I've never seen ANY
pdp-8 boards laying around anywhere, and they would probably fetch a
decent price on eBay..
I've seen lots of DEC boards lying around at resellers' places... Even
10 years ago, there were plenty more PDP-11/VAX customers than PDP-8
customers, that resellers focused on Unibus/Qbus stuff and had to be
pestered a little to look for specific OMNIBUS boards.
As for eBay prices, I've won plenty of auctions in the past year for
$10 PDP-8 parts (KK8E boards, 3rd party core memory, OMNIBUS
peripherals). I don't pay "any" price for this stuff... if it gets
too expensive, I wait. I've seen plenty of boards I've gotten for $10
go for $50-$80 on other auctions. Part of successful eBaying is not
fuelling the demand side of the supply and demand curve.
-ethan
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