Found a chip in my mailbox today: Z8400AB1
Is this the Z80 CPU?
Not sure who put it there... Doesn't look toasted... No bent pins...
It may be good!
Does it have any useful purpose by itself?
< Yes , I giggled thru the rest of the ng posts, many of which are
<unintelligable to me. I keep hoping that enlightenment will
<miraculously happen. I have been monitoring this ng for a while
<and picking up snippets of info. It occurred to me that the
<PDP8/e/f/m maintenance manual (vol 1 } that I had acquired and
<kept since my course on dig. electronics in 83 because it had a
<beautiful description of the fetch sequence in processors might be
<of value in this group. If it's quite available "nevermind"
that is an interesting doc. While it may have been common at one time
may simply were tossed making them scarce (or still on a shelf somewhere).
I'd be interested as I still like hacking with PDP-8s.
Allison
Rich,
Hmmm... let's see if I understand you correctly. You have a TRS-80
Model I with EI and floppy drive and when you turn the system on, the
screen fills with random garbage? I have one sitting here in my office
and that appears to be normal behavior if there is no bootable disk in
drive 0 when the computer is turned on or reset. Try holding down the
BREAK key and hitting reset button to enter ROM BASIC.
As I recall, if the EI is connected then the system checks the BREAK key
and jumps to BASIC if it's pressed, otherwise it reads the first sector
>from the disk and executes it. All this happens before video RAM is
initialized so the screen is filled with trash.
Hope this helps,
- Doug
At 11:18 AM 8/19/97 -0700, you wrote:
>Now you can push LOAD to get the tape drive to scan for the load
>point. If it just keeps going and going then there is a problem with
>the light/sensor assembly.
It could also mean that you wound the tape onto the take-up reel past the
load point, or that the tape didn't have one (i.e., it was cut/broken off.)
Try re-loading the tape, after checking for the load point thingy (a little
silver piece of something on the tape.)
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
sinasohn(a)crl.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.crl.com/~sinasohn/
Message text written by INTERNET:classiccmp@u.washington.edu
>BTW, what's the correct name for that series of connectors? We tend to
call them 'Amphenol Connectors' in the UK (while realising that Amphenol
make a wide range of different connectors). I've also seen them called
'Centronics Connectors' (after the common use for the 36 pin one I guess),
IEEE (or IEEE-488) connectors (after the common use for the 24 pin one)
and 'Telco Connectors'. I think the last is what HP call them.<
They are generically called "Centronics connectors" in the U.S., being 36
pin, 24 pin, or whatever. The HP connectors are called IEEE-488, since
that is the standard they follow; never heard them called "Telco
connectors" by HP or anyone else.
Gil Parrish
I purchased a batch of old micros which included 3 Apples, 1 ][E and two
that are not identified. The motherboards are longer than on the "E" and
extend under the keyboard. The keyboard has a white key labled upr and lwr
case, pwr. in the lower left corner, and the rear of the case has U shaped
cutouts instead of the type of openings on the "E" and "+".
I havent been able to find "Apple" on the case or motherboard but the
power supply seems identical to that in the "E" and "+". Can anyone suggest
what I have?
Thanks
Charlie Fox
While scouring the garage sales this weekend I found 2 old video games,
an Atari Pong and a Magnavox Odyssey. They both work, and I could NOT
pass them up at the sellers asking price! Hopefully someone else collects
these older games. If anybody knows of a list or web site I would
appreciate the info.
P.S. My T/S 1000 hasn't been sold yet, I guess it is not yet a
collectors piece.
Regard, David Quackenbush dhq(a)juno.com
Re: the 9-track thread on the HP 7970:
Mention has been made that it seems to have an HPIB interface. I ran into
the same thing with an HP7974 drive that I acquired from Teltone here in
Washington state.
However, I also found that the HPIB interface consisted of a removable
cage with three cards and its own power supply. Once this subassembly was
removed, the drive itself appeared to be a standard Pertec interface. I
have yet to actually try it, but a pair of 50-pin card-edge connections
sure look like Pertec to me.
I will let the group know once I get a chance to actually try it.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Sysop, The Dragon's Cave BBS (Fidonet 1:343/272)
(Hamateur: WD6EOS) (E-mail: kyrrin2(a)wizards.net)
http://www.wizards.net/technoid
"Our science can only describe an object, event, or living thing in our own
human terms. It cannot, in any way, define any of them..."
At 05:55 AM 8/19/97 +0000, you wrote:
> drive alignment for various disk drives (not even close to ready yet).
Something to mention is to make copies of disks created on drives you plan
to realign before realigning them. That is, if drive A is out of alignment
and disk A was created on Drive A, make a copy of disk A (in drive A) onto
disk B in Drive B (where drive B is a known, well aligned drive.)
Otherwise, when you get all your drives working fine, you won't be able to
read any of the disks created when they were out of whack.
--------------------------------------------------------------------- O-
Uncle Roger "There is pleasure pure in being mad
sinasohn(a)crl.com that none but madmen know."
Roger Louis Sinasohn & Associates
San Francisco, California http://www.crl.com/~sinasohn/
Does anyone else find this hilariously funny?
> ----------
> From: Tim Shoppa
> Reply To: classiccmp(a)u.washington.edu
> Sent: Monday, August 18, 1997 5:29 PM
> To: Discussion re-collecting of classic computers
> Subject: Re: What's an M7165?
>
> > What's an M7165?
>
> One half of a KDA50. The other half is a M7164.
>
> Tim.
>
