The printer is back, cleaned, tested, and fully working with manual, 5
typewheels, and 7 carbon ribbons.
Since I've put several hours into it, it's no longer free, but if
anyone wants it make an offer.
Okay,
I have the manual now (a listmember kindly downloaded it and sent it to me, thanks again).
However, one picture in there shows the cardcage (not very clearly or close-up, I have to add), but it looks like theirs has all slots populated. Either they used one which was fully tricked out with options, or mine is indeed missing some cards.
I'll have a look what's in mine sometime next week.
So long,
--
Arno Kletzander
Hilfskraft Informatik Sammlung Erlangen
www.iser.uni-erlangen.de
Psssst! Schon vom neuen GMX MultiMessenger geh?rt?
Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
I have been scrounging for parts for my computer, and I believe I have hit
the jackpot. A friend of mine set me up with some older Seiko control system
boards, various revisions, from the late 80s. On them are many ICs,
including RAMs, Z80 CPUs, and PIOs, as well as some AMD Arithmetic
processors, a Z80 SIO/2, and other various components. I want to try to make
my computer from these components. Can anyone point me in a good direction
for the datasheets, preferably online, for these mostly obsolete ICs? Some
of them I don't even know what they are, and some I cannot find online,
presumably because they are obsolete. Here's a partial list of them:
NEC D780C
NEC D770008AC-6
NEC D4364C-15L
NEC D8251AC
NEC D449C
AMD AM9511A-1DC
Sharp LH0081A
Sharp LH0082
Intel 8339
Intel 8325
Intel K3235001
Zilog Z8442BPS
Zilog Z8430BPS
Thanks for any help
>
>Subject: Re: Building my own classic style computer update
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Fri, 24 Aug 2007 23:52:47 +0100 (BST)
> To: cctalk at classiccmp.org
>
>>
>> I have been scrounging for parts for my computer, and I believe I have hit
>> the jackpot. A friend of mine set me up with some older Seiko control system
>> boards, various revisions, from the late 80s. On them are many ICs,
>> including RAMs, Z80 CPUs, and PIOs, as well as some AMD Arithmetic
>> processors, a Z80 SIO/2, and other various components. I want to try to make
>> my computer from these components. Can anyone point me in a good direction
>> for the datasheets, preferably online, for these mostly obsolete ICs? Some
>> of them I don't even know what they are, and some I cannot find online,
>> presumably because they are obsolete. Here's a partial list of them:
>> NEC D780C
>
>AFAIK it's an exact equivaletn of a Z80 CPU. I've never found a circuit
>that works with one and not the other.
It is an exact bug for bug and hidden opcode match for Z80/MK3880.
>> NEC D770008AC-6
You sure of that number?
>> NEC D4364C-15L
>
>I guess that's a 64K*1 DRAM, similar to a 4164
Might be mask rom if 24/28 pin.
>> NEC D8251AC
>
>Equivalent to the Intel 8251, National Semiconductor INS8251, etc. It's a
>USART
There are differnt flavors of the 8251, and the D8251AC is similar to the
intel 8251A. It's a matter of different bugs.
>> NEC D449C
6116 ram 2kx8
>> AMD AM9511A-1DC
>
>AMD floating point chip
>
>> Sharp LH0081A
>> Sharp LH0082
>
>No idea
>
>> Intel 8339
>> Intel 8325
>
>Are you sure you've not given me the date codes?
Those are either mask roms or date codes.
>> Intel K3235001
>
>No diea
Thats a mask and date code. Not a part number.
Just google "z80" there are a carload of sites for those parts
and people playing with them.
Allison
I've started a project to use the Catweasel for making images of NorthStar
hard sector disks. I have some working code. It is not ready for public
release.
Please contact me offline if interested in being a developer. The code is
not available publicly at this time.
Thanks
Andrew Lynch
I've just bought the base unit (VS240) for a VT240 terminal on E-bay and
know little about it (OK, I know it's a DEC graphics terminal). Perhaps
somebody can enlightent me
1) One site i looked at said a VT240 is a monochrome unit, a VT241 is the
colour version. Is the only difference the monitor? Can I use a colour
monitor with my base unit?
2) On the back are obvious connectors for an RS232 port (DB25), current
loop (8 pin mate-n-lock). There's a DE9 labelled 'PR', presumably a
printer port, also RS232. A RJ11 keyboard socket, I assume an LK201 will
work here (yes?). A BNC which seems ot be composite mono video. And a
DA15 plug, also for a monitor. I assume a VR201 links here, or a V241
with the right cable. Also, can I connect the keybaord to, say, the back
of the VR201, or do I have to use the RJ11 on the terminal itself?
3) How much is known about the insides? Of course I've taken it apart.
It's really easy to get inside, just undo 2 screws on the bottom at the
very front and remove the top cabinet shell (lift it up from the front).
Then release 2 nylatch fasteners and lift up the metal screening cover.
The PSU (a switch-mode unit) is inside the cover. Reach inside and unlug
the PSU ribbon cable from the mainboard and remove the cover/PSU. The
mainboard comes out by releasing 3 more nylatch fasteners.
On this board, there's an 8085, 2681 (dual serial chip), 8251 (USART,
maybe used for the keybaord interface), 7220 (graphics chip) -- along with
what seemms to be much the same circuitry as a Rainbow colour card, there
are a couple of PALs, I've not checked to see if they're the same as the
ones in the 'bow. Pletny of RAM and ROM, and some glue logic. And another
40 pin chip, DC310. For some reason this is saying 'processor' to me. Is
it?
-tony
Just a thought ..
Wouldn't the model making fraternity have this kind of problem all the
time.?
There must be a way to make a mould using an existing part as the
template.
Rod
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of woodelf
Sent: 24 August 2007 20:16
To: On-Topic and Off-Topic Posts
Subject: Re: DEC switch handles
Dave McGuire wrote:
> I have an interest, but only for a handful. Will is right; the
> molds will be the killer. I worked on a commercial product a few
> years ago that used a two-part plastic chassis that was about the size
> of a small book. The two halves were very, very simple...no weird
> shapes, and not difficult for mold design. The "cheap" aluminum molds
> cost us about $10,000 to have made, and the good stainless steel ones
> (last much
> longer) were to cost about $18,000.
I was looking at DIY molding ... 1 ounce of plastic at most.
But you need access to a machine shop ... None around here.
See here for the book. http://www.lindsaybks.com/dgjp/index.html
> Molds for small parts such as switch handles will be cheaper, and
> there's a side benefit to their small size: we might be able to design
> one mold that can make several different types of switch handles
> (PDP8/e-PDP11/20 style, PDP11/45-PDP11/70 style, etc) in one shot.
> DEC didn't use that many different styles of switch handles.
I got drooling over things like the PDP-12. Don't forget you need
several colors. The problem is finding a place that does small runs.
> There's still the front-end-loaded cost of having a mold cut, but
> after that, the community would never again have problems getting
> switch handles.
Or you can get custom switches made ... Now what about the switches that
go with the handles? Are they special?
> -Dave
>
> --Dave McGuire
> Port Charlotte, FL
> Farewell Ophelia, 9/22/1991 - 7/25/2007
>
>
>
>
> .
>
If you use the simh VAX simulator (which emulates a VAX 3800 iirc), the oldest version of VMS to support this one is V5.1.
VMS V5.5-2 is the last V5.x version before V6.x came up - some like the last sub version of a main version most because they think they're the most stable ones.
If you use the simh VAX780 simulator (which emulates the VAX 780, the first VAX ever built), the oldest version of VMS to support this one should be V1.0.
If you want really old VMS versions (V4.x and earlier) just contact me offline.
Ulli
(The Vaxorcist)
... And now for somthing completely different..
As many of you know my main interest is DEC equipment.
As with most electronics its the parts that are under the most stress
that fail.
I am starting to accumulate a pile of DEC VT series terminals with low
out put picture tubes
and failed Line Output Transformers.
Before doing anything drastic it crossed my mind that somebody at some
may have changed the tube in a DEC terminal.
There are two issues with this one.
a) Where do you get the replacement tube from.
b) How do you fit it.
If anybody has tried it I would be pleased to hear how they got on.
Rod Smallwood
The DecCollector
> From: ard at p850ug1.demon.co.uk> To: cctalk at classiccmp.org> Date: Thu, 23 Aug 2007 20:39:10 +0100> Subject: Re: Gooey rollers again.> > > This is a great idea. I have used two part, rubber like, materials in > > the past. I found I can buy new rollers for $35 each, much too expensive > > for all 16 needed. I'll probably buy one and try to make a mold from it. > > I'll post the results. > > I was thinking about mashining a mould from a block of metal and using that.> >
---snip---
Hi
I thought I might add that even with a mold, it will be difficult
to keep it concentric. It is best to over size the mold and
grind it down to the right size.
Dwight
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