A new show is posted! A whopping two-parter at 55 minutes each, with Blake
Patterson as our guest from bytecellar.com / toucharcade.com
Retro Computing Roundtable podcast, show 17
Get it through iTunes or listen online @ http://bit.ly/pAJWKs or download it
directly @ https://public.me.com/dgreelish
Best,
David Greelish
President, Atlanta Historical Computing Society
I understand that the build quality of the 49G isn't up to the build
quality of the 48SX. How does the build quality (I'm mostly interested
in the build quality of the keyboard...) of the 48GX, 48GII, and 50G
compare with the 48SX? How do they compare with that of the 49G?
Peace... Sridhar
Hi All
I finally got aproved after waiting "for a while" :-)
If i were to ask about the pps-4/1 would it be here or on cctalk ?
Med venlig hilsen/Regards
Benjamin S?lberg
I've been assembling from source code most of the HP diagnostics for the HP2100 and HP1000 systems. To do so, I used Eric Smith's original "asm21" - and found that a number of diagnostics didn't assemble correctly. I updated it - and subsequently Terry Newton joined the project and made more updates. Between us, over the course of several months, we've managed to debug asm21 to the place where we have not found any more errors in several additional months of use.
asm21 runs under both *NIX and Windows environments as it is written entirely in Perl.
Te get a copy, do an anonymous FTP to bickleywest.com and cd to the asm21 directory. Download (binary) asm21_107.zip
If you're using Firefox, Chrome or Opera, simply use:
ftp://bickleywest.com/asm21
to get to the directory, then right click on asm21_107.zip to download it.
BTW: Terry created a great testing environment - scripts and software that allowed us to assemble source code and subsequently check asm21's binary output against HP's binaries which had been created under one of their OSs.
Cheers,
Lyle
--
Lyle Bickley, AF6WS
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"
On Thu, 13 Oct 2011 20:59:46 +0100 (BST), ard at p850ug1.demon.co.uk (Tony
Duell) wrote:
> I am very sorry to hear that.
>
> I am sure he won't get the media hype that followed the passing of Steve
> Jobs last week, but I am also sure that dmr had a much greater influence
> on the sort of computing that I am interested in than Steve Jobs did.
>
> :-(
Sad indeed.
Seeing that OS X is in some sense Unix-based, I would say DMR won...
/Jonas
On Thu, 20 Oct 2011 20:18:06 +0100 (BST), ard at p850ug1.demon.co.uk (Tony
Duell) wrote:
>> years ago). How hard is it to replace the batteries?
>
> Very easy.
>
> The battery pack clips into the bottom of the machine, you just slide
> it
> slightly forwards (towards the '0 key end' of the machine and lift
> the
> rear edge to get it out.
>
> The battery pack contains 2 AA-size NICd cells connected in series,
> normally by a double-spring thingy (that;s a highly techncial term,
> of
> course). The housing is made in 2 parts which were glued together.
> You
> cna crack the glued joint, take it apart, and fit new cells.
>
> But actually, I don't recomend doing that. It's better to cut away
> the
> pack housing ad the front end, where the cells touch the contacts in
> the
> calculator. Then silde out the old cells and slide in the new ones --
> taking care of the polarity (since HP calculators were designed for
> use
> with their own battery packs only, which only fitted the right way
> round,
> there is no reverse-polarity protection. The cells will be held in
> place
> when the pack is clipped into the calculator, and you can remove the
> cells easiy for charging in a normal charger, thus avoiding possible
> damage to -C models.
>
There is a *much* easier way to do it, which doesn't mutilate the pack
anywhere as badly.
Cut through the strip of plastic which runs along the pack between the
batteries at one end, using e.g. a pair of side cutters or a scalpel.
The strip will now flex out of the way sufficiently for you to be able
to prise the batteries out, one at a time. Then push the new batteries
in the same way. This operation doesn't weaken the pack mechanically to
any noticeable extent, it can be used just as before, and the batteries
can be replaced any number of times.
OTOH it is harder (not very) to get the cells out to charge them in a
normal charger.
Note that the contacts in the calculator are simply large rivets
soldered in to circuit board fingers. That solution is a bit of a
let-down IMO, as is using the battery as a load to reduce the voltage
from the charger, simply limiting the current with a whopping big
resistor. It could have been done a lot better, and not much more
expensively.
Everybody who had an HP-25 (just about everybody who didn't have a
TI-57) when I was at University learnt to do this.
/Jonas
(2) MODEL 7600 rackmount cases, each populated with 8 Preston SCI floating differential amplifiers, model number 8300 XWB-B.? Can't tell you if any of the amplifiers are working or not, I do not know.? They appear to be in good condition.
I also have (4) Mitsubishi 2019CEB40 CRT's.? Three of them look unused - they still have a blue plastic sheet covering the faceplate and have been stored in the original shipping crates.? All of the tubes are coated with a white phosphor. ?
If you are interested, contact me offline and I can provide photos of the equipment or additional information.? Location is St. Louis.
In my last post I included a small C program to strip high order bits and "zero" characters from 21xx .tap files. Unfortunately, I posted an old version. Here's the correct version:
cvhp.c
------
#include <stdio.h>
main()
{
int c, d;
while ((c = getchar()) != EOF) {
if (d=(c & 0x7f)) putchar(d);
}
}
------
Cheers,
Lyle
--
Lyle Bickley, AF6WS
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"
