Atari 1040 4MB RAM upgrade problems

Upgrade your RAM from ST to Falcon.
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rubber_jonnie
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Re: Atari 1040 4MB RAM upgrade problems

Post by rubber_jonnie »

PhilC wrote: Mon May 10, 2021 1:18 pm @rubber_jonnie I was talking shifter chip into adaptor board

But agree, forget that and get it running without to see if it still works.
We're definitely in agreement then!
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800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
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Re: Atari 1040 4MB RAM upgrade problems

Post by kmcrainey »

I did as you suggested and resoldered into place the onboard RAM and turned on the system and it boots up.

PXL_20210512_235202567.jpg
PXL_20210512_235202567.jpg (280.43 KiB) Viewed 3781 times

As a side note: the purply color is somehow caused by my convertion to SCART to HDMI, as it happens with my other 1040 STFM.

I still have the shifter chip on the board and plugged into the socket, so I assume that shows that there is nothing wrong with the shifter chip or board. That leaves me with the MMU component, I would guess. I don't see any issue physically, with the MMU board.

Any suggestions on next steps?


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Malcolm
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Re: Atari 1040 4MB RAM upgrade problems

Post by exxos »

Place the ribbon cable in the shifter board and check from the free end of the cable to the shifter pins and make sure all 16 wires have continuity , with the power off of course ...
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Re: Atari 1040 4MB RAM upgrade problems

Post by kmcrainey »

I tested the continuity on the pins leading to the ribbon cable port and the far end of the ribbon cable, that would plug into the MMU. There was continuity on all pins.

PXL_20210513_033357182.jpg
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PXL_20210513_033119002.jpg
PXL_20210513_033119002.jpg (164.16 KiB) Viewed 3777 times

I tried testing continuity from the pins on the shifter IC itself and there is not continuity from those pins to the end of the ribbon cable, but I'm not sure if that is what you were referring to.

PXL_20210513_033105413.jpg
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PXL_20210513_033119002.jpg
PXL_20210513_033119002.jpg (164.16 KiB) Viewed 3777 times

UPDATE: I tried reconnecting the ribbon cable (no clue if it led to or caused this), but now I am getting a constant "trilling" or "RRRRRRRR" sound from the computer when I power it on. I disconnected the 4MB RAM from the MMU, but it is still occurring.
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Re: Atari 1040 4MB RAM upgrade problems

Post by stephen_usher »

With that purple background it looks like you've bad connections on the shifter, in this case specifically the red output, but there could be others. Check those pins!
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Re: Atari 1040 4MB RAM upgrade problems

Post by rubber_jonnie »

@kmcrainey

You still haven't addressed the issue of the 5 pins on the Shifter's right hand side (Same side as the connector on the Shifter adapter) that are not properly in the socket and are possibly the cause of your purple screen.

You need to get these fundamentals right before moving on to the next thing, or you end up with one problem layered on another.

Steps I'd advise:
  1. Put the machine back to its known working condition.
  2. Remove the Shifter from its adaptor and straighten the legs, being careful not to snap them.
  3. Replace the Shifter into the adaptor making sure you have the pins straight and properly in the socket.
  4. Replace the Shifter Adaptor complete with Shifter onto the mainboard.
  5. Test to make sure you have restored the screen to correct colours.
Then return to the 4MB RAM expansion installation, because then you'll know the Shifter adaptor is working for the shifter part of the install.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: Atari 1040 4MB RAM upgrade problems

Post by exxos »

You're on the wrong side of the shifter...pinout is here https://www.exxosforum.co.uk/forum/viewt ... =10#p60270
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
kmcrainey
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Re: Atari 1040 4MB RAM upgrade problems

Post by kmcrainey »

I did mention earlier that I believed the purple border is a result of the video convertion from DIN to SCART to HDMI. Just to make sure, I hooked it up to my original Atari monitor and the boarder is not there:

PXL_20210513_171143833.MP.jpg
PXL_20210513_171143833.MP.jpg (279.64 KiB) Viewed 3717 times

Does this normal image show that there is no issue with the shifter chip as it is attached to the shifter board? Is that's the case, that just leaves an issue with the pins leaving the shifter board, the the lines through the ribbon cable, the pins entering the 4MB ram board that is on the CPU, The way the 4MB ram is situation on the upgrade board, and finally the way that the 4mb board is set on the MMU.

Please let me know if I am correct in ruling out the shifter IC and the shifter board, excluding the ribbon cable port.
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Re: Atari 1040 4MB RAM upgrade problems

Post by kmcrainey »

I am also still getting this "RRRRRRRR" sound continuously now for audio, which only started happening yesterday after reconnecting the upgraded RAM. I resoldered the on board RAM, computer booted up fine. Then I attached back the ribbon cable from the shifter board to the MMU and now this constant sound. I don't know if it's related to the ribbon being rehooked up, it's just what I did before it started happening. Any ideas on what could cause this and how I can fix this?
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Re: Atari 1040 4MB RAM upgrade problems

Post by exxos »

As the problems are mounting up, I suggest you send your board to @Steve to repair before things get any worse..
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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