This is a really trivial question, but I wasn't really a BBC micro hacker
in the old days,
I am planning some upgrdes to a BBC Model B+ (the fact that this
particular B+ lives in the bottom of an Acorn Cambridge shouldn't
matter...). One of them is to combine some of the ROMs (the B+ can take
27256 32K byte EPROMs), thus freeing up some ROM sockets and put a RAM
chip in one of them. I then have to fiddle the write-enable line [1] (should
be easy) and I have 32K of sideways RAM.
The hardware doens't worry me (I have schematics...). But how do I load a
ROM image into the sideways RAM? Is there some loader program I need (and
where do I get it)? Anything I should know about the image file on disk
(anything about the start/end/entry addreeses in the direxctory, for
example)?
[1] I believe it's a good idea to be able to write-protect the sideways
RAM, but I don't want to drill holes in my Cambridge. Has anoyne ever
used the cassette motor line for this? Seems like an obvious thing to use.
-tony
The Tech Journal had a whole series of programs for a while. When I got
my Cauzin SoftStrip reader, I kept an eye open for any magazines that
could be used with the reader. They are still waiting to be read :).
> Tom Jennings <tomj at wps.com> wrote:
> >
> >I remember that! It was some bar code variant, I think the
> >code was some BASIC hack small enough to type in. I have no
> >recollection what the hardware was though. 1980s.
>
> Cauzin SoftStrip. Basically a 2-D barcode, read with a handheld scanner.
>
>
> --
> Don Hills
Brad Parker <brad(a)heeltoe.com> wrote:
|Anyone on the boston or mass/nh/ct area have a working 9-track drive
|which can read 800bpi tapes?
I have two drives which can in theory read 800bpi. One is a relatively
modern quad density unit and the other is an old rack-mount dual. The
latter is not currently connected to a computer, but it could be if the
former fails to perform. I'm in Gloucester.
Dan Lanciani
ddl(a)danlan.*com
Anyone happen to have a spare HP 2100A front panel key or know where I can
get one?
The HP 2100A I acquired is locked in the OFF position and disassembling the
switch to bypass the lock doesn't look like too much fun. I think someone
offered a key when I first asked about this a long time ago but I didn't
take them up on the offer at the time.
-Glen
On Tue, 05 Oct 2004 21:45:57 -0400, David V. Corbin
<david(a)dynamicconcepts.us> wrote:
> Before bidding, would it be possible to get the following pictures:
>
> 1) Internals (cover off would be ideal, but listing the little cover should
> be sufficient
> 2) Closeup of the key tops
> 3) Printed sample
I've posted them at http://www.4mcnabb.net/images/ASR33 .
My lovely spouse has finally laid down the law on the computer
collection. I've pondered for weeks the best way to move the stuff
out, and I think I've settled on a silent auction here on the classic
comp mailing list. This will (hopefully) keep it out of the hands of
scrappers and intact, since most of it still works, and I'm not really
looking for Ebay prices, just a new home and maybe my investment back.
So here is the deal. I'll accept bids for one week after an item is
posted. I'd prefer the winner pick the item up, but I can deliver
anywhere within about a 700 mile radius of Blacksburg, VA. Elsewhere
we'll have to work out once we know the final destination.
So, without further delay, here is the first thing - a nice *WORKING
with no missing pieces* ASR-33 teletype.
A picture is at http://cmcnabb.cc.vt.edu/projects/pdp8/asr33.jpg and
I'll throw in a whole slew of unpunched papertape and unprinted paper.
Bids and questions should be emailed to cmcnabb(a)gmail.com any bids
sent to the list will be ignored. The teletype listing will end on 12
October, 2004.
Hi,
Does anyone know what 4 quick beeps at
power on means for a Commodore PET 4032?
When I hit the power switch, the 4 beeps
come immediately, and then nothing ...
no sound, and nothing at all on the CRT.
This is a new-to-me 4032, allegedly working.
thanks,
Stan
I was contacted recently someone at WPI who had been approached
about reading an old DECtape. They no longer have the DEC-10
at WPI, so need to find someone with working DECtapes who might
be able to read the tape...
If anyone has a working DECtape drive on their system, please
let me know so I can pass it on...
Megan
I am trying to figure out what tape drive was used to write some DDS tapes
that I'd like to read. The only clues I have are that they were written
on a VAX of some sort under VAX OpenVMS 5.5-2.
Any ideas?
Thanks!
--
Sellam Ismail Vintage Computer Festival
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