Fred Cisin (XenoSoft) wrote:
> > > seeing one that had some extra diagnostics and stuff. And, of course,
> > > there was the Sorrento Valley Associates board that did MFM in Apple][
>
> On Thu, 19 Dec 2002, Sellam Ismail wrote:
> > Ooh, juicy! Where can I get one of those?
>
> It's been a while since I've seen one. They were mostly pushed in the 80s
> for being able to connect 8" drives!
There was also a Vista 8" floppy controller for the Apple ][, built
around the WDC 1793 I think. I have one of those in a Basis 108.
-Frank McConnell
I pulled out my IC Master last night and indeed they are 4kx1 chips. So, the
board is a 32k board.
-----Original Message-----
From: Eric Smith [mailto:eric@brouhaha.com]
Sent: Thursday, December 19, 2002 10:20 PM
To: cctalk(a)classiccmp.org
Subject: Re: CompuPro RAM board settings
Rich Cini wrote:
> I just got a CompuPro RAM20 memory board with no manual.
[...]
> The memory array is 8 columns of 8 chips, type MM2147J. I'm thinking
> that these are 2kx1 chips, resulting in a 16k board.
They're 4K chips.
Someone somewhere may have sold 2K chips (probably as half-good 4K chips),
but they sure weren't very common.
Richard Cini wrote:
> I just got a CompuPro RAM20 memory board with no manual. I'm looking
> for the DIP switch settings specifically, but a copy of the manual would be
> very helpful.
And here I was kicking myself for forgetting to take the CompuPro
Product User Manuals volumes back out to storage where they would be
buried in boxes all the way at the back. My forgetfulness is your
good luck tonight.
> It's missing two chips...a 74LS74 at U6 and a 25LS2521 at U10. The
> memory array is 8 columns of 8 chips, type MM2147J. I'm thinking that these
> are 2kx1 chips, resulting in a 16k board.
No, it's a 32KB board. 8 rows of 4KB each. Your "missing" ICs are
explained below too.
Switch 1 enables 4K blocks, one position per row.
SW1-1: row 0 ON enables row;
SW1-2: row 1 OFF disables row
...
SW1-8: row 7
Switch 2:
Positions 1-4 set the base address of the board on a 4KB boundary.
SW2-1 is the least significant bit, SW2-4 is the most significant,
write your desired start address in binary and then a 1 means
turn the switch on and 0 means turn it off. So OFF OFF OFF OFF
means the board starts at 0x0000, ON OFF OFF OFF at 0x1000, ....
Position 5: ON: RAM XX is a standard/global memory
OFF: RAM XX is to be used as extended address or bank
select memory
Position 6: ON: enables response (deselect) to PHANTOM
OFF: disables response to PHANTOM
Positions 7 and 8 matter if the board is being used as a bank
select memory. If you want the board to come up enabled when
you turn on the computer, SW2-7 should be on and SW2-8 should be off.
If you want the board to come up disabled, SW2-7 should be off and
SW2-8 should be on. Never leave them both on or both off.
Switch 3:
If you are using the board as extended address memory,
put the 25LS251 in position U11 and leave positions U6 and U10
blank. (This is why you're missing a couple ICs!) Then,
Switch 3 sets bits A16 through A23 of the extended address.
SW3-1: address bit A16 ON = 1,
SW3-2: address bit A17 OFF = 0
...
SW3-8: address bit A23
If you are using the board as a bank select memory, put the
25LS251 in position U10 (leaving U11 blank) and put a 74LS74
into position U6. Then, Switch 3 sets the bank select port
address.
SW3-1: port address bit A0 ON = 1,
SW3-2: port address bit A1 OFF = 0
...
SW3-8: port address bit A7
Switch 4:
If you are using the board as a bank select board, Switch 4
sets the data bit(s) that will enable the board when written
to the bank select port.
SW4-1: data bit D0 ON = 1,
SW4-2: data bit D1 OFF = 0
...
SW4-8: data bit D7
Note that if more than one switch is set, then the board will
be enabled if *any* bit matches.
-Frank McConnell
Hello, all:
I just got a CompuPro RAM20 memory board with no manual. I'm looking
for the DIP switch settings specifically, but a copy of the manual would be
very helpful.
It's missing two chips...a 74LS74 at U6 and a 25LS2521 at U10. The
memory array is 8 columns of 8 chips, type MM2147J. I'm thinking that these
are 2kx1 chips, resulting in a 16k board.
Any help appreciated. Thanks.
Rich Cini
Collector of classic computers
Build Master for the Altair32 Emulation Project
Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
/************************************************************/
I've got one of these that I used extensively a
few years ago (superceded by AS300 4/266 and
then a C*q DS10) that won't do anything at all.
No SRM console comes up.
Problem is that about 3 years ago I removed the
memory, which consisted of what it came with
(DEC standard 32 MB) plus a 64 MB set which I
believe was actually an IBM product. When I
took the faithful 2000 out of service I put as
much of its memory as I could into the AS 300
4/266, and gave the AS300 it to a client (out of
state). When I went back to the 2000 to get it
ready to give away to a student group that wants
to run Linux on it, I realized that I'd removed
all of the memory and could not remember how to
populate the slots. I do remember that when I
put the 64 meg in it wouldn't work at first, but
Field Service told me I had to interleave the 8
mb sticks and the 16 mb sticks.
So, I'd be grateful if anybody could answer
these questions:
1. How are the 8 slots populated, normally?
2. Should I see the SRM even with no memory, or
memory incorrectly installed?
3. Is "54-21246-FA" (2MX33) DEC memory AS2000
memory or AlphaStation 200 memory? (I've had a
few of those around the shop over the years).
Thanks in advance. I'm glad I found this group.
I started my business with a VT103 / RX02 / RT11
v3 combo, went through Micro-11/23, then 73,
then MicroVAX 3100, AS2000, AS300, and now the
DS10.
Don Mitchell
runtime(a)wzrd.com
www.run-time.com
Thanks, Huw. It came up with 4 sticks of 4 MB
36bit memory, placed n alternate slots down from
the top. I now think that it won't ever come up
w/o 4 sticks of something -- I had 2 sticks of
16mb memory (the other 2 went into the 300
4/266) and I guess it just won't boot w/o 4
sticks.
Thanks again. Now the kids can have it and do
their Linux thing. I'll chase down some memory,
or they can.
Don
Was'nt the "spo256" a ti voice synth chip or was it a
gi product.
i do remember when radio shack carried the spo256 and
the companion text to speech chip (cannot remember the
part number for that chip)
Bill.
Message: 42
From: "Davison, Lee"
<Lee.Davison(a)merlincommunications.com>
To: "'cctalk(a)classiccmp.org'" <cctalk(a)classiccmp.org>
Subject: RE: Old TI analog sound chip; info?
Date: Tue, 17 Dec 2002 09:02:10 -0000
Reply-To: cctech(a)classiccmp.org
> I'm looking for the documentation for the olde TI
analog
> sound chip; this dates back to the late 70's early
80's if
> my memory serves me correctly. I don't even
remember the
> part number. AFAIK, it had some kind of "I2L" (I
squared
> el) technology or somesuch, and it was mostly
analog, with
> some digital control (but nothing like a DSP or
midi).
> Anyone recall this chip? Anyone have the datasheet
for
> it online or willing to scan it in?
SN76477N,
http://rgvac.978.org/chips/sn76477datasheet.pdf
> Background: I remember playing with it a *long*
time ago,
> and wanted to model it in software :-)
I remember it well, it was the canine gonads until the
AY3-8910
and it's ilk appeared.
Cheers,
Lee.
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Hi, John.
I got your address whilst searching for info on a TEK 213; you came up on a
chat room. I bought a 213 recently at a government auction here in
Australia, but it doesn't work properly. The 213s seem to be as rare as
rocking-horse-droppings here, and I can't find a manual. Are you able to
copy the manual you have?? If so, what would it cost?? If it's too
difficult or expensive, maybe just the circuit diagrams & views of the PCBs.
I'm not sure about postage, it might fit a large Global Priority Envelope at
US$9.
I'd appreciate any help.
Regards, Kerry.
I am trying to identify various computers that have had their ports
situated in the front of the chassis as opposed to the back.
The Atari 800 would be one example (game ports in the front). Are there
any other examples anyone can think of, especially where peripheral (disk,
printer) or perhaps network ports are concerned?
--
Sellam Ismail Vintage Computer Festival
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