Re: Playing with HP2640B

We just dumped the enhanced character ROMs from a HP2645. 8k bipolar mask ROMs, 90 ns (they need to be fast since they are used as video RAM really). I read them on the Data IO using their PROM equivalent, AMD 27S181. The microvectors sets (line set and large character sets) are 9 bits. The 9th

Re: Playing with HP2640B

On 2017-Dec-05, at 1:20 PM, Brent Hilpert via cctalk wrote: > On 2017-Dec-05, at 1:08 PM, Mattis Lind wrote: >> 2017-12-05 20:44 GMT+01:00 Brent Hilpert via cctalk : >>> On 2017-Dec-05, at 9:14 AM, Mattis Lind via cctalk wrote: >> Does the 27S82 have any equivalents

Re: Playing with HP2640B

On 2017-Dec-05, at 1:08 PM, Mattis Lind wrote: > 2017-12-05 20:44 GMT+01:00 Brent Hilpert via cctalk : > >On 2017-Dec-05, at 9:14 AM, Mattis Lind via cctalk wrote: > > >> Does the 27S82 have any equivalents that I could look up instead in the > >> device list? > > >FWIW,

Re: Playing with HP2640B

2017-12-05 20:44 GMT+01:00 Brent Hilpert via cctalk : > On 2017-Dec-05, at 9:14 AM, Mattis Lind via cctalk wrote: > > > > Looking more into this document revelas that it covers three boards > > 02640-60009, 02640-60088 and 02640-60112. > > > > Now I had the idea of dumping

Re: Playing with HP2640B

On 2017-Dec-05, at 9:14 AM, Mattis Lind via cctalk wrote: > > Looking more into this document revelas that it covers three boards > 02640-60009, 02640-60088 and 02640-60112. > > Now I had the idea of dumping the character ROM as well. But what is a AMD > 27S82? I cannot really find a datasheet

Re: Playing with HP2640B

On Tue, 5 Dec 2017, Mattis Lind wrote: 2017-12-05 16:51 GMT+01:00 Mike Loewen via cctalk : On Tue, 5 Dec 2017, Mattis Lind wrote: 2017-12-05 16:26 GMT+01:00 Mike Loewen via cctalk : On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote: While

Re: Playing with HP2640B

2017-12-05 16:51 GMT+01:00 Mike Loewen via cctalk : > On Tue, 5 Dec 2017, Mattis Lind wrote: > > 2017-12-05 16:26 GMT+01:00 Mike Loewen via cctalk : >> >> On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote: >>> >>> While going through the HP2640B I

Re: Playing with HP2640B

On Tue, 5 Dec 2017, Mattis Lind wrote: 2017-12-05 16:26 GMT+01:00 Mike Loewen via cctalk : On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote: While going through the HP2640B I found two boards which I cannot find relevant schematic and description for, the 02640-60009

Re: Playing with HP2640B

2017-12-05 16:26 GMT+01:00 Mike Loewen via cctalk : > On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote: > > While going through the HP2640B I found two boards which I cannot find >> relevant schematic and description for, the 02640-60009 Display Memory >> Access Module and

Re: Playing with HP2640B

On Tue, 5 Dec 2017, Mattis Lind via cctalk wrote: While going through the HP2640B I found two boards which I cannot find relevant schematic and description for, the 02640-60009 Display Memory Access Module and the 02640-60088 Display Timing Module. Anyone has more info on these? The manual

Re: Playing with HP2640B

I have now dumped the firmware from the HP2640B terminal. Since the EA4900 ROMs are not much like normal EPROMs in regards to pinout and supply voltages I resorted to use a logic analyzer to dump the contents of the ROM simply by parsing out the ROM accesses while the terminal did the selftest. It

Re: Playing with HP2640B

> Wow! Excellent job Mattis > I have seen that HP2640 when it still was in bad shape. The HP2640, > that I have, has many tiny spots on the screen. Your “result after” > really looks fantastic. Thanks Henk! I have a few more screens that need fixing. The most difficult will be the Tek 4016.

RE: Playing with HP2640B

Van: Mattis Lind via cctalk<mailto:cctalk@classiccmp.org> Verzonden: vrijdag 17 november 2017 11:52 Aan: David Collins<mailto:davidkcolli...@gmail.com>; General Discussion: On-Topic and Off-Topic Posts<mailto:cctalk@classiccmp.org> Onderwerp: Re: Playing with HP2640B The scree

Re: Playing with HP2640B

On Fri, 17 Nov 2017, David Collins wrote: Christian do you know the gauge of the wire you used ? And the current? It was a wire for cutting polystyrene blocks. The current was a fews amperes, I think, driven off a bench power supply. Christian

RE: Playing with HP2640B

I did it by heating the crt to about 50-60 degrees celsius and used a putty-knife. https://www.flickr.com/photos/hp-fix/albums/72157689357633754 The photos are from a Philips P2000M system but I did it the same way with my 264X terminals and 9845's systems. It takes about half an hour to heat

Re: Playing with HP2640B

The screen on my HP2640 had degenerated quite far. It was only a spot in the middle, 2 by 4 inch, that still attached the glass to the CRT. I used a thin fish fillet knife to dig through the remaining glue. Before

Re: Playing with HP2640B

Christian do you know the gauge of the wire you used ? And the current? Maybe I should try that approach again! David Collins > On 17 Nov 2017, at 8:09 pm, Christian Corti via cctalk > wrote: > >> On Thu, 16 Nov 2017, CuriousMarc wrote: >> What did you do for the

Re: Playing with HP2640B

Marc, in addition to Mattis’ forthcoming reply, my recent experience with a moldy 2624A was that the hot wire method was very poor. Too hard to get the wire in, didn’t melt the ‘glue’ very well, smelly. Gave up when the wire broke. What worked best for me was a flat blade screwdriver that was

Re: Playing with HP2640B

On Thu, 16 Nov 2017, CuriousMarc wrote: What did you do for the screen mold? Hot wire method to separate CRT from implosion window? Put the CRT in a hot water bath? Chip at the glue? Marc What we did on one of our 2645 terminals was the hot wire method. We then attached the "implosion"

Re: Playing with HP2640B

What did you do for the screen mold? Hot wire method to separate CRT from implosion window? Put the CRT in a hot water bath? Chip at the glue? Marc On Nov 15, 2017, at 11:48 AM, Mattis Lind via cctalk wrote: I have been working on a HP 2640B terminal. It was mostly

Re: Playing with HP2640B

2017-11-16 1:25 GMT+01:00 : > is there a dif between 40 a and 40 b with the firmware/loader/etc? > Ed# > I assume there are a difference. The document linked to below at least tell that the original A had a completely different set of ROM chips whilst rev date "April

Re: Playing with HP2640B

is there a dif between 40 a and 40 b with the firmware/loader/etc? Ed# In a message dated 11/15/2017 12:48:24 P.M. US Mountain Standard Tim, cctalk@classiccmp.org writes: I have been working on a HP 2640B terminal. It was mostly about fixing the "screen mold" problem and