Does anyone have the pinouts of the Nascom 2 keyboard connector handy?
I'm wondering if there are any duplicated ground lines such that I can
get away with running a cable via DA15 connectors (the connectors on the
'2 and keyboard PCBs are 16 pin headers)
I'm pretty sure there are duplicates but I don't have a huge amount of
Nascom docs here at present (certainly not schematics)
I'm at the point where I've got a nice keyboard shell made up for my
Nascom's keyboard from a mixture of wood and aluminium, and need to fit
a socket to the back of it...
cheers
Jules
Hi,
after several cleaning orgies, my SMD disk (AMPEX DFR-996, see other
posting) seems to start working.
Now I want to backup the data contained on the disks. These are RSX-11
volumes. I cannot read them under RT11. And I don't know if I can make a
diskette RSX-11 to inspect the data. Or is there a preogram which runs
on rt11 and is able to understand rsx11 filesystem? That would be great!
My first idea for the backup was "copy/device dm0: tt:" which works. But
there is no error correction and still only 19200 baud.
So tell me, what are the really cool methods to transfer data between a
PC and a real PDP11 at a reasonable speed? SCSI controller and SCSI
disk? Something else? Ethernet?
Or is a backup over serial line a normal thing...?
Regards,
Philipp :-)
Jim wrote:
> Along these lines, I have a nice Timex Sinclair 1000 package if
anyone > is interested. Main machine, memory expansion IIRC, commerical
> program diskettes, and lots of technical documentation. If
> interested, email me and I can dig it out and get a full list of
> materials.
Umm, I take it you mean *cassettes* ??
Later --
Glen
0/0
The best way to program 2708's is with a Cromemco Bytesaver in an S-100
system (I think someone already said that).
There were 3 versions of the Bytesaver:
-Bytesaver I (2708)
-Bytesaver II (2708)
-32K Bytesaver (2716's)
The primary difference between version I and version II was that version II
had "bank select" and could much better coexist in a system without removing
RAM memory to make a "hole" in the memory map. In fact, with version II of
the 2708 bytesaver and the 32k Bytesaver, you could have a full 64k memory
map of RAM and both Bytesavers (2708 and 2716) in the machine at the same
time, and the programming software could do the necessary bank switching to
manipulate the memory map.
Definitely try to get the Bytesaver II for 2708 burning.
I have software to do the programming as well, and there were some Bytesaver
burning programs in the CP/M user's group. There was a listing and paper
tape that came with the program (the listing is in the manual), but it was
crude and rudimentary, however the "burn nucleus" can be used with a more
sophisticated front end.
On Jun 26 2005, 0:49, lee davison wrote:
>
> >> What programmer can I look for that has the ability to program a
> >> 2708?
>
> I have a Softy 2 that can do it if you're really stuck.
>
> > Not just that, the programming algorithm is different to most
> > other EPROMs. IIRC you have to program all locations in sequence,
> > giving each one a 1ms (IIRC) programming pulse, and repeat that
> > 50 times.
>
> Any bit in any byte can be individually programmed from 1 to 0.
> There are no sequence requirements, the programming pulse is one
> pulse of 50ms per location programmed.
Not on any of mine. Some later EPROM types can be programed either
way, but not original 2708s.
> > You can't program odd locations like you can in later EPROMs.
>
> You can, it's EPROM microcontrollers like the 68705 that need to
> be programmed in sequence.
Sure you're not looking at the specs for a 2716? Tony's information is
correct for a 3-rail 2708 according to my Intel, Motorola, Texas data
books.
--
Pete Peter Turnbull
Network Manager
University of York
I'm having a hell of a time getting any program to load, so far I've been
Totally unsuccessful.
Anyone have any tips or advice they can throw at me?
Would love to hear anything at all :)
When I worked at Genicom, they had a printer refurbish department for "all
brands" and I saw various Epson, etc. printers going out that looked just
like new, and I saw them coming in with the yellow discoloration. I asked
one of the guys how they did that, and he said that they painted the covers.
The discoloration is caused by UV light exposure, which in turn comes from
fluorescent lighting. It won't happen under incandescent light, but all
offices have fluorescent lighting.
> OK, I'm ready to burn a modified copy of the Altair Turnkey
> Monitor into a 2708 to use in my 8800b as a test program. Lo
> and behold, my programmer won't do a 2708 -- it'll only go down
> to 2716. Naturally I don't have any 2716s around and the VG
> ROM board accepts only the 2704 or 2708 (without modification).
How about making an adapter from sockets to use a bigger EPROM
such as a 2764/128/256 ? You can do this without madifying the
VG ROM board and you'll have it next time you need to fill a
2708 socket.
Lee.
.
___________________________________________________________
Yahoo! Messenger - NEW crystal clear PC to PC calling worldwide with voicemail http://uk.messenger.yahoo.com
If anyone needs approx 40 IEC line cords - mostly 6 feet, but some
shorter and some longer - to provide AC power to their older but not
antique computers, I've got a bunch available for free. I'm just
outside Washington DC. E-mail me at my non-list address,
shoppa at trailing-edge.com, with IEC in the subject if you're interested.
Will not ship, but will gladly let you pick up as many as you need.
None of these are the "ribbed" 20A variety, sorry.
Tim.
