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InsaneMultitasker

Myarc cards for sale/repair tips

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2 hours ago, GDMike said:

nd left the cover off the Geneve

I've mentioned this in the past:  if you remove the clamshell from the Geneve and later tug downward on the monitor, keyboard, joystick, or mouse cable there is a chance you will tilt/lift the front end of Geneve card in its PEB slot, possibly shorting out the Geneve and other peripheral cards.  Even the PEB cover and the foam on the underside of the cover may not be enough to keep the card from shifting.  

 

I tell you this so you are informed and can take precautions with your cabling while you do your best to keep the card cool. 

 

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Bump for Ricky.

 

Hi Ricky,

   Did you get any further with PFM Geneve?

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4 hours ago, dhe said:

Bump for Ricky.

 

Hi Ricky,

   Did you get any further with PFM Geneve?

No, been waiting for the insane one to get his thoughts together, life takes precedent over hobby. Been plenty to keep me occupied too.

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On 8/8/2021 at 9:22 PM, globeron said:

 

https://atariage.com/forums/topic/309626-general-upscaler-thread/?do=findComment&comment=4880734

 

Trying my luck to see if someone in the general upscaler forum knows what the issue can be. Oe can it still be a Geneve 9640 issue because the Hz seems to keep changing between 59.x and 60.x see video.

 

After troubleshooting/swapping HDMI cables, monitor, etc. (and having suddenly a stable signal somehow). We finally found the issue when my kid turned on his PC  which has a 5m USB cable  (and another 5m USB cable extender) connected to a USB to DB9 and then DB9 to DB25 and to the DB25 of RS232 interface card in the Geneve 9640, which apparently interferes the signal via the RS232 card/PEB box to the Geneve card and interferes with the video signal of the Geneve itself I guess? (or it is external interference of the USB cable to the other cables) or the OSSC device ?  or Monitor?    No clue, but now the video-signal is stable and can use the Geneve 9640 normally.   

 

Question:  in MY ART  when changing different graphic modes (with Enter) between 16 and 256 colors, it is normal that the monitor need to sync. the signal again, correct? 

 

 

 

 

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On 9/18/2018 at 12:51 AM, mizapf said:

 

It is definitely on my todo list, just to remind you.

 

(However, I also plan that my boot ROM has some Swan on the title screen, but maybe much smaller. I don't like boot EPROMs without the Swan. 🙂 )

I agree! I miss the Swan, too... ;-(

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21 hours ago, dhe said:

Tim breaks through to second level on memex test!

The ol' bird won level 2.  Today I returned the Geneve the shelf to contemplate next steps for a future bout.  The random, hard to reproduce, intermittent connection failure is my least favorite problem to troubleshoot.

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Today I resurrected a SCSI revision "G" card. The card had been modified to take power directly from a PC power supply via a molex connector; I didn't want this particular setup any longer, so I replaced the power circuit with a DC-to-DC converter and proper caps.  Everything checked out OK but when placed in my PEB system, it caused lockups, other cards stayed activated during powerup, and other 'fun' problems.  Not knowing for certain if my mod caused the problem, I reverted to a 7805 w/caps; unfortunately, the same issue was present.   I didn't have any HCT244 chips laying around but I did have LS245s, so I replaced the LS245 and now the card seems to be functioning.  A part of me wants to try the DC-to-DC converter approach once more, another part of me wants to leave well enough along.  I will probably put this card up for sale if it continues to perform as expected. 

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21 minutes ago, InsaneMultitasker said:

Today I resurrected a SCSI revision "G" card.

Is there a fix on these cards to make SCS0 work?  I have to use SCS1.

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34 minutes ago, OLD CS1 said:

Is there a fix on these cards to make SCS0 work?  I have to use SCS1.

If you mean a DSR modification to pair SCSI ID0 with SCS0, SCSI ID1 with SCS1,...SCSI ID6 with SCS6., then no, nothing that I am aware of.  Keep in mind that most DSRs avoid unit #0, thus for the SCSI card, SCS1 pairs to SCSI ID0 and so on.    Modifying the DSR could be relatively simple if unit 0 isn't used internally for other purposes.

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42 minutes ago, InsaneMultitasker said:

Keep in mind that most DSRs avoid unit #0, thus for the SCSI card, SCS1 pairs to SCSI ID0 and so on.

I have to double-check, but I am pretty certain I have my SCSI device set for ID1.  Will report back later.

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Does anyone here have a GenMod Geneve at their disposal?  I would like to confirm whether or not the two GALs on the GenMod daughterboard (affixed to the back side of the Geneve) are socketed or soldered directly to the daughterboard.

 

The Genmod I am attempting to repair is socketed.  Unfortunately, the larger chip no longer has its legs/leads;  I suspect that its leads were intentionally shortened before installing on the daughterboard, most likely due to a previous repair attempt.

 

Some of the wires routed to the daughterboard were poorly soldered, so I am also assessing whether to attempt a complete removal and re-installation of the board or wire directly to the chip (bypassing the board).

 

We have good installation documentation but no way to produce/program the GALs as the info was never released.

 

image.thumb.png.94c757fac028ead0e8b8bc9117c69b65.png

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This weekend I unsoldered the genmod board from the Geneve, replaced the socket for the smaller GAL and soldered the larger GAL directly to the daughterboard.  All wired connections were cleaned up and confirmed and I touched up the gate array connections.  The major chips were replaced with functioning chips from my spare card (and the genmod Geneve's chips were tested in my spare for cross-validation) for test purposes.

 

Unfortunately, even after the cleanup and repairs, the Geneve would not recognize the 32K static RAM expansion and was exhibiting errors in the other memory pages. The gate array signal for the expansion RAM was tied to the genmod board, with proper continuity and no shorts that I could detect.  If the addressing was faulty, I would expect more than 4 pages to fail (in the same row or different columns), so I suspect the GAL is malfunctioning and can no longer access the expansion ram pages.   :( 

 

Following discussion of the situation with the card's owner, I removed the genmod modification and turned the card back into a standard Geneve.  The card seems to be working and so far no memory errors or sporadic lockups.  I was quite torn over removing the genmod since not many of these devices are in working order, still, a working standard Geneve is better than a non-functioning genmod.  This week I'll do some burn-in testing together with other peripheral cards, before I return everything to the owner.

On 9/19/2021 at 1:08 PM, InsaneMultitasker said:

I suspect that its leads were intentionally shortened before installing on the daughterboard, most likely due to a previous repair attempt.

Update: the legs were intentionally clipped for clearance reasons between the genmod board and the surface of the back side of the Geneve.

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