>From: "Tim Riker" <Tim at rikers.org>
---snip---
>
>Does anyone know what the "Sandia Laboratories" desk + racks is for?
>There is only one thing left in the rack and it's in real bad shape.
>
>http://rikers.org/gallery/hardware/20050415_092748
>http://rikers.org/gallery/hardware/20050415_092802
>http://rikers.org/gallery/hardware/20050415_104726
>
---snip---
Hi Tim
Sandia Labs do all kinds of things. They even build
one of a kind super computers to all kinds of things.
That rack could have been just about anything. Unless
it was someone that worked there, that worked on that
specific machine, I doubt anyone would know what it
was for. Even then, it may be that because of their
security clearance, they couldn't tell you what it was.
Dwight
-------------------Original Message:
Date: Thu, 14 Apr 2005 20:24:56 -0400
From: Ethan Dicks <ethan.dicks at gmail.com>
Subject: Re: Dead AIM 65??
<snip>
>The downside is that there's only room on the mainboard for 4K,
>so memory expansions are external, and used to cost a lot
>(and are rare now because there didn't use to be a wide variety of them).
Later versions had provision for up to 40K on board; I've got one
sitting beside me.
>It's pretty useful out of the box for a machine that doesn't
>come with a disk interface. You certainly get more than the few
>digits and a calculator keypad of the KIM/SYM line.
Don't forget about the built-in current-loop & almost-RS232 interface;
with the built-in monitor & text editor it was almost a "real" computer
when connected to a terminal/TTY, even using the built-in (very reliable)
cassette interface instead of the optional disk drive.
Other factory options included EPROM programmer, Centronics
printer interface, CRTC video interface etc.; languages included
BASIC, FORTH, PL/1, Pascal and assembler; the AIM65 was also
the core of a fairly extensive professional 65xx development
system with the AIM65 SPS & DOS ROMs and various
optional RM65 expansion modules.
mike
--------------------Original Message:
Date: Thu, 14 Apr 2005 10:44:26 -0700
From: Andy Dannelley <andyda at earthlink.net>
Subject: Dead AIM 65??
<snip>
Connected the +5v only and turned it on again... nothing, nada, zilch
(bummer)
I don't have a scope or anything, I only have a VOM, so my testing is
rather limited, I don't even know anyone who still has an o'scope.
Any ideas of what I could try?
Any ideas of a way I can get it repaired in So. CA?
Thanks for any and all help or ideas,
Andy
------------------Reply:
Make sure both the STEP & TTY switches are forward (toward the
keyboard) and press RESET a few times; they were reluctant to
start at times. If there's a remote RESET button, disconnect it.
Next, I would try removing all unnecessary chips & swapping where
possible, in case one of them is locking up the bus (the most common
problem).
There were several models/revisions of the AIM 65; assuming you have
one of the original 4K 20 column versions with 2114 RAMS and not
the 40K version with 32K & 8K RAMs (or the 40 column version):
Remove Z7, Z12, Z18, Z6, Z11 and Z17, as well as Z1 (6522).
(If it's a 40K model: remove Z1 and Z2)
Also remove Z24, Z25 & Z26 if there are any (Option ROMs).
Confirm that Z22 & Z23 contain R3222 & R3223 ROMs respectively.
If it still doesn't start, replace the Z32 6522 (underneath the display) with
the one you removed; also, if it's a 4K model, try replacing the two
remaining 2114s (Z2 & Z3) as Ethan suggested.
If it's still dead, by all means try measuring the address & data lines as
Tony suggested (one of those times when an analog VOM is useful).
Good luck!
BTW, the 24V is indeed only required for the printer, so you can leave it
disconnected; it will start with a "PRINTER DOWN" message if the
printer is not powered or connected.
And FYI: BASIC was an option (Z25 & Z26) as was the assembler, PL/1,
and a host of other goodies. And the 40 column model did indeed have
a fluorescent display; the 20 col. versions used DL1416 LED displays.
Jules: I may still have some display covers; I'll have a look & let
you know. BTW, AIM65s were indeed just bare boards & keyboards initially,
with various 3rd parties making cases for them, but then Rockwell
(and later Dynatem, who took over the AIM65) started to supply them
with the metal-bottom/brown-plastic-cover case & power supply.
mike
--------------------Original Message:
Date: Thu, 14 Apr 2005 10:44:26 -0700
From: Andy Dannelley <andyda at earthlink.net>
Subject: Dead AIM 65??
<snip>
Connected the +5v only and turned it on again... nothing, nada, zilch
(bummer)
I don't have a scope or anything, I only have a VOM, so my testing is
rather limited, I don't even know anyone who still has an o'scope.
Any ideas of what I could try?
Any ideas of a way I can get it repaired in So. CA?
Thanks for any and all help or ideas,
Andy
------------------Reply:
Make sure both the STEP & TTY switches are forward (toward the
keyboard) and press RESET a few times; they were reluctant to
start at times. If there's a remote RESET button, disconnect it.
Next, I would try removing all unnecessary chips & swapping where
possible, in case one of them is locking up the bus (the most common
problem).
There were several models/revisions of the AIM 65; assuming you have
one of the original 4K 20 column versions with 2114 RAMS and not
the 40K version with 32K & 8K RAMs (or the 40 column version):
Remove Z7, Z12, Z18, Z6, Z11 and Z17, as well as Z1 (6522).
(If it's a 40K model: remove Z1 and Z2)
Also remove Z24, Z25 & Z26 if there are any (Option ROMs).
Confirm that Z22 & Z23 contain R3222 & R3223 ROMs respectively.
If it still doesn't start, replace the Z32 6522 (underneath the display) with
the one you removed; also, if it's a 4K model, try replacing the two
remaining 2114s (Z2 & Z3) as Ethan suggested.
If it's still dead, by all means try measuring the address & data lines as
Tony suggested (one of those times when an analog VOM is useful).
Good luck!
BTW, the 24V is indeed only required for the printer, so you can leave it
disconnected; it will start with a "PRINTER DOWN" message if the
printer is not powered or connected.
And FYI: BASIC was an option (Z25 & Z26) as was the assembler, PL/1,
and a host of other goodies. And the 40 column model did indeed have
a fluorescent display; the 20 col. versions used DL1416 LED displays.
Jules: I may still have some display covers; I'll have a look & let
you know. BTW, AIM65s were indeed just bare boards & keyboards initially,
with various 3rd parties making cases for them, but then Rockwell
(and later Dynatem, who took over the AIM65) started to supply them
with the metal-bottom/brown-plastic-cover case & power supply.
mike
Anyway, back to the original subject.
There is no magic bullet to bring these older machines
back to life. Some of the things that can help
are, not in any particular order:
1. Volt meter
2. Logic Probe
3. Set of schematics
4. Oscilloscope
5. Soldering iron w/ solder
6. Parts to swap
7. assembler/disassembler
8. EPROM programmer
9. Source listing
10. Needle nose pliers
11. solder sucker and/or solder wick
Also, one needs clear logical thinking ( not all that
common in the world today ).
The debugging procedure is in specific order:
1. gather symptoms and observations.
2. Form hypothesis of possible cause.
3. Test to see if hypothesis is correct.
4. If problem not found, include results into observations
of step one and repeat.
Dwight
>I am basically in the same boat. I have a Z2, no diskette (well, it had
>one, but it was seriously warped).
>
>A 5.25" disk image, along with a way to send it via a serial port would be
>just the ticket.
>
>Any developments since 3/25?
I have software working which will both backup and restore Cromemco disks
by reading/writing tracks to/from memory via the RDOS RD/WD commands,
and transferring the data to/from the PC with D and SM commands ... it's
slow, but it works, and I have successfully backed up and recreated both
CDOS and Cromix boot disks in both 5.25" and 8" formats.
The only problem is that in order to WD the disk, it has to be formatted.
Currently I have to boot CDOS to format the disk - but once I have a
blank disk (all it needs is the physical formatting since the file system
will be overwritten), I can create either a CDOS or Cromix boot disk
via a serial connection.
The next step will be to see if we can transfer the CDOS and INIT images
code directly to memory and activate it via the serial port - if I can
get this working, then you should be able to create a boot disk without
having to boot the system into CDOS first. I've just gotten busy with
other things....
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html
Last week I found a box marked "IBM" "01480" "DC Volts" that has three
Nixie tubes in it. I tested it and sure enough it's DC voltmeter. It's
black and measures roughly 4"w x 2 1/2" x 8". It has a single neon light on
the LH side that acts as a "1" so that it can read up to 1.999. On the side
of the box is a sticker that says API Instruments Model 430 and has the
pinout of the rear connector and some other data. Anybody know what this is
out of or anything else about it?
Joe
My current scope ... for the past 25 years ... is a Heathkit IO-4235, the
last scope that Heathkit really designed themselves and offered in kit form
(there were some later scopes, made by other firms and private labeled).
The 4235 is dual trace, delayed sweep, 35MHz. It's in new condition, but it
has sat in storage, in a box, for years at a time, at least 3 times. And on
two occasions I've really had to tear into it to make some major repairs
(shorted tantalum caps blow the power supply .... and they blow it
violently, with smoke, fire and loud acoustics), but it's in new condition
right now.
About 4 months ago, the pilot light (an incandescent 24 volt bulb) blew out.
While I was in there to replace the light bulb, I noticed a 3500 uF 35 volt
capacitor in the power supply totally blown apart. Mind you, the scope was
working, and I am quite sure that the capacitor had been that way for years.
The trace does seem "smoother" since I replaced that.
If anyone is looking for a good scope on E-Bay, the Heathkit IO-4510 was a
very good basic, triggered sweep dual trace scope (although only 15MHz), and
can be found cheaply on E-Bay (it will probably cost you more to ship than
you will pay for it). It's actual construction is in some ways better than
that of the 4235.
>PS. while on the topic of 6502's , does anybody know where I can get
>a pdf online data sheet 68B50 ? Datasheets for the 8 bit stuff is getting
>harder to find all the time for the original products.
It's on my website:
http://www.parse.com/~ddunfield/museum/index.html
Go to the "Dunfield 6809 Portable" section under "Homebuilts", and
then on to "Documentation" and "Reference material" - I have a
scanned 68[AB]50 datasheet there.
Regards,
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Collector of vintage computing equipment:
http://www.parse.com/~ddunfield/museum/index.html