[torontocbm] Re: Fw: Re: PET 2001-8
- From: "wbochar" <admin@xxxxxxxxxxx>
- To: <torontocbm@xxxxxxxxxxxxx>
- Date: Fri, 1 Aug 2014 18:16:02 -0400
I put an inductive amplifier in front of the PET monitor, not a sound. (in
front at 1084 it's crazy noisy). So the Tube isn't powered at all.
From: wbochar [mailto:admin@xxxxxxxxxxx]
Sent: Friday, August 01, 2014 5:55 PM
To: 'torontocbm@xxxxxxxxxxxxx'
Subject: RE: [torontocbm] Re: Fw: Re: PET 2001-8
Well I think it's the monitor..
CH(A) is 6502 pin IN and CH(B) is Pin 1 off of the SRAM in the first bank
http://www.wbochar.com/wp-content/uploads/2014/07/IMAG007.bmp
Then goes this post boot.
http://www.wbochar.com/wp-content/uploads/2014/07/IMAG008.bmp
From: torontocbm-bounce@xxxxxxxxxxxxx
<mailto:torontocbm-bounce@xxxxxxxxxxxxx>
[mailto:torontocbm-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Stein
Sent: Friday, August 01, 2014 3:15 PM
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Subject: [torontocbm] Re: Fw: Re: PET 2001-8
Yeah, unfortunately that sometimes happens when power is applied after a
long time asleep; dried-out capacitors fail after a while, ICs can't stand
the stress, etc.
----- Original Message -----
From: wbochar <mailto:admin@xxxxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Sent: Friday, August 01, 2014 3:08 PM
Subject: [torontocbm] Re: Fw: Re: PET 2001-8
Oh boy.
He just went dark. The screen isn't responding at all. I read the voltage
off the side Tape Drive Port and its getting +5 Volts. I was pretty
surprised the monitor was working initially. Normally after shutting the PET
down, the CRT fades to the Dot. Nothing when you turn on or Turn off.
I've left him off for a little while to take breather.
From: torontocbm-bounce@xxxxxxxxxxxxx
<mailto:torontocbm-bounce@xxxxxxxxxxxxx>
[mailto:torontocbm-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Stein
Sent: Friday, August 01, 2014 2:16 PM
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Cc: admin@xxxxxxxxxxx <mailto:admin@xxxxxxxxxxx>
Subject: [torontocbm] Fw: Re: PET 2001-8
Just to confirm: they are 2114s and not 6550s, right?
m
----- Original Message -----
From: Mike Stein <mailto:mhs.stein@xxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Sent: Friday, August 01, 2014 2:08 PM
Subject: Re: [torontocbm] Re: PET 2001-8
Sounds like both are bad all right; let me see if I can find & spare a pair.
m
----- Original Message -----
From: wbochar <mailto:admin@xxxxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Sent: Friday, August 01, 2014 1:42 PM
Subject: [torontocbm] Re: PET 2001-8
I figured out why mail seems to be going back and forth funny. My VPN
connection (to Europe) has some funky mxrecords for my domain. My email
server gets a larger batch of IP's as a reference and ends up getting
blocked by the freelists.org server. I got a batch of emails telling me it's
getting block because it can't verify the address. Arg. So I just have to
remember to turn off the VPN client for the time being until I figure out
why my VPN's network gets a larger set of MX records.
Anyways.
I moved the last two chips one by one in into video ram, and I got some
great PET Video Art. Which basically says, they are both bad. Correct?
From: torontocbm-bounce@xxxxxxxxxxxxx
<mailto:torontocbm-bounce@xxxxxxxxxxxxx>
[mailto:torontocbm-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Stein
Sent: Friday, August 01, 2014 11:02 AM
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Subject: [torontocbm] Re: PET 2001-8
Might just be one; try POKEing 0 and 255 into any location between 6144 and
7167 and PEEK it back; that should tell you.
The early BASIC restricted where you could PEEK/POKE, but I assume it
excluded a specific upper area and included at least the lower 8K regardless
of how much was functional.
If you get it down to one chip I could drop off a replacement; send me your
phone no. off-list.
m
----- Original Message -----
From: wbochar <mailto:admin@xxxxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Sent: Thursday, July 31, 2014 3:41 PM
Subject: [torontocbm] Re: PET 2001-8
After the Active Surplus Dentist kit, I got 6143 :)
After a little back and forth between the slots it looks like I have 2 bad
chips.
I noticed the second last pair had some funky stuff in the socket, with a
little elbow grease and dentist pick I managed to clean the pin receptacles.
From: torontocbm-bounce@xxxxxxxxxxxxx
<mailto:torontocbm-bounce@xxxxxxxxxxxxx>
[mailto:torontocbm-bounce@xxxxxxxxxxxxx] On Behalf Of wbochar
Sent: Thursday, July 31, 2014 2:55 PM
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Subject: [torontocbm] Re: PET 2001-8
I did the ram shuffle,
5119 is the maximum ram I am getting. Looks like 4 chips are bad or the last
four ports are funny.
From: wbochar [mailto:admin@xxxxxxxxxxx]
Sent: Thursday, July 31, 2014 1:50 PM
To: 'torontocbm@xxxxxxxxxxxxx'
Subject: RE: [torontocbm] Re: PET 2001-8
I'm downtown - Dundas and Dovercourt.
I'll give the ram shuffle a try and get back to you. I'll try resocketing
them, over time they might have moved up or some other material may have
messed with the pins. If that doesn't help, I start the Ram moving :)
This machine is turning into FrankenMonster, I really don't mind looks -
more into getting him in the best possible shape internally. So if I can get
the ROMs and RAM up to date, that would be great. I don't mind spending some
money on him, I've never had a functioning PET before and there are some
many programs I have sitting around from a long time ago. My grade school
had 4 of them and a 4040, my dad who was teacher at another school would
sneak one home for the summer. PET's were my first intro to programming..
there was a miner game that I heavily modified and would like to see again
:)
Thanks for the help :)
--Wolf
http://wbochar.com
From: torontocbm-bounce@xxxxxxxxxxxxx
<mailto:torontocbm-bounce@xxxxxxxxxxxxx>
[mailto:torontocbm-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Stein
Sent: Thursday, July 31, 2014 11:56 AM
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Subject: [torontocbm] Re: PET 2001-8
Hi Wolfgang,
Sounds like you've got at least one bad RAM chip or socket; fortunately the
320132 board uses 2114s, which are still relatively easy to find.
The lower 2K are working, so try removing the 3rd pair of RAM chips (I6 &
J6) and replacing it with the last pair (I1 & J1); with luck you'll get it
up to 6143 bytes free or even the full 7167 if it's a poor socket.
One way of testing RAM chips if the system is working is to leave a good
pair in I/J7 & I/J8 needed to run, pull one of the video RAM chips (C3 or
C4), and one by one replace it with the chip you want to test.
And yes, there are several ways of upgrading the ROMs, depending on how much
you want to spend and whether you care how it looks.
Whereabouts are you BTW?
Good luck!
m
----- Original Message -----
From: wbochar <mailto:admin@xxxxxxxxxxx>
To: torontocbm@xxxxxxxxxxxxx <mailto:torontocbm@xxxxxxxxxxxxx>
Sent: Thursday, July 31, 2014 12:37 AM
Subject: [torontocbm] PET 2001-8
I've got a PET 2001-8 that recently came back to life.
I was out drinking with friends (around 2001), I stumbled while walking
downtown over this PET. I took the PET home (I still live downtown) which
was really in bad shape. His Exterior was rusted and his chassis was
impossible to open. Someone had cut off his power cord too.
He got put into storage with Family for a while (I moved around a lot). And
not so long ago, (well this week) I got him back. I had to cut the screws to
the lid, popped the top and looked inside. At some point the chassis became
the home of some creatures, which I cleaned out the remnants of the nest.
The mainboard was in decent shape, and after everything was clean and chips
pressed into place I powered him up. The screen actually worked and I got
some random garbage for a second. After a few checks on the MB I soldered a
few spots and restarted him. He works.
After looking inside it, I noticed the Logic Assembly Part Number is 320132.
The exterior doesn't have the chicklets, or the tape drive, it's a 9"
monitor with the PET ASCII Keyboard (minus the CAPSLOCK when I found it). He
also reports:
*** COMMODORE BASIC ***
1023 BYTES FREE
Which by the *** and model number 2001-8 he's got original ROM's.
But doesn't that also mean 2001-8 should have ~8K free (7167)?
I've posted images of the mainboard, screen and model sticker to my site:
http://wbochar.com
Any thoughts on the RAM? All of the chips are populated, maybe this was
scavenged before being discarded.
If I recall, the ROM's in early revision 2001's can't go to Basic 4 but 2/3
is available correct? Well if I can get ROM's that is.
I do recall at the one or two TPUG meetings that I did attend and the WOC,
someone mentioned a modern ROM upgrade. Are these still around?
PS: Leif I like the Network stuff you've been working on :)
--Wolfgang Bochar
admin@xxxxxxxxxxx <mailto:admin@xxxxxxxxxxx>
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