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I found this article today. Perhaps someone finds it of interest. Regards, Carlos

Stick an edge card connector on the bottom of some perforated board and you could use point to point wiring. I have built ISA cards that way. If you can find them, I think NEC uDP444 SRAMs which draw

Hi David I had wondered about upgrading my 7854 with newer RAM and ROM boards and was even considering laying out new PCB's. I havn't looked at pricing for a small run of PCB's but it is probably

postscript: Q719 is open. Jerry Massengale

Hi, I powered up the 7514 I received this morning and found there is a .03uf cap arcing on the z-axis card. The cap is connected between Pin MH and ground. I did not leave it on long enough to measure

<bhaskins@...> wrote: It might be worth reflowing the solder connections on that socket. Maybe there was a cold or failed solder joint. Take the IC out if you do that though so the tinning

I agree, and had done that but in this case only removing and cleaning worked. I guess that I just got lucky in that the probe tip made the missing connection long enough to "shout out" the real

<david.partridge@...> wrote: I assume that the self test/memory backup switch function relies on the newer firmware. I think the hard part would be copying the new firmware to the old memory

One of my standard troubleshooting techniques is to use a small screwdriver to lift all socketed ICs (not so much as to remove a pin, just to wipe the contact) and reseat them. Just a small twist of

David, Do you have the schematics of this later memory board? I think it would be a great modification to change the earlier board to do this too. Regards, David Partridge

I believe the behavior you are seeing is normal. I have the most recent 7854 hardware version which has a lithium backup battery mounted on the memory board. On the back of the mainframe where the

Hi David, In my pdf section 6 the missing pages are 6-16, 17, 18, 19, 22 (done), 23 (done), 26,27, 34, 35. There might be a more complete pdf, so perhaps wait or Herbert. Albert

Yes, it is normal.

On 12/19/2012 05:39 PM, David wrote: > > On Wed, 19 Dec 2012 17:00:50 -0500, Bert Haskins > <bhaskins@... <mailto:bhaskins%40chartermi.net>> wrote: > > >On 12/19/2012 02:34 PM, David wrote:

Ok... No biggie, if someone wants to let me know, I can scan those as well. I don't particularly want to scan the whole thing, it isn't tiny..... David

Hi Bogdan, I did not trz up to now, but I think, it will goon with working with all the parameters from before and with the waveforms retained ! Herbert Am 21-01-2013 15:20, schrieb bogroca:

Hi Herbert, I assumed that myself. The question that bothers me, is that about what is the NORMAL behaviour when power-up with the battery back-up connected? The manuals, both the op and service, say

Hi , thanks to all especialy to David !!! I have included the two pages and put the file to http://www.ko4bb.com/manuals/index.php?dir=10%29_Recent_Uploads where we all like to download !!! Herbert Am

Be prepared for more requests David, several other pages are missing as well ;=). Albert

I'll email it directly in two seconds, since attachments tend to be dropped from the mailing list. I just scanned the two pages into one tif file. Chopping it up is left as an exercise for the reader.