20 September 2020, 09:01 | #1 |
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Faulty 1200 Ram Upgrade
Hi All
I have an Analogic 12000 8mb rma upgrade that doesn't work. When I install it I get a faulty board error through the expansion baord diagnostic screen it is being recognised by the 1200. What specifically triggers this screen - is it a power issue with the board? I have checked the ram in my accelerator and it works so there must be a fault with the board. I have done a bit of continuity testing and all seems ok (haven't done every trace as there are rather a lot) and the board itself looks nice and clean. I have taken pictures of the board. Any suggestions to get it working? Thanks |
20 September 2020, 09:11 | #2 |
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Does another expansion card working in the A1200?
Clean the connector pins/fingers on the A1200, and on the expansion card. Also, try the trick of seating the card all the way in, and then pulling it out by 1 or 2 mm. |
20 September 2020, 11:18 | #3 |
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Yes - I have av 030 accelerator working fine. Have already tried pulling the card out a bit. I bought it as faulty so don't think my 1200 is prob. As I said, card is very clean and looks quite new so don't think connector is the issue. Thanks for suggestion.
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20 September 2020, 12:19 | #4 |
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OK. Maybe try reflowing the through-hole pins. There is also an cap that probably needs looking at.
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20 September 2020, 12:22 | #5 |
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Yes - was wondering about the capacitor. How do I test it - only really a beginner on the electronics front and thought this card would be a good project. It was very cheap and not much to it!
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20 September 2020, 12:56 | #6 |
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Which ROM version?
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20 September 2020, 15:03 | #7 |
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3.0 - sorry I'm old fashioned!
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20 September 2020, 15:37 | #8 |
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20 September 2020, 18:34 | #9 | |
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Quote:
No other smaller ram to try - have 16mb in my accelerator so if I need to try 4mb then would need to buy one. |
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21 September 2020, 14:48 | #10 |
MI clan prevails
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I have a BC-1208MA RAM card (similar to yours).
With 8MB modules I get a red screen on boot. With 4MB modules everything is fine. |
21 September 2020, 15:09 | #11 |
ex. demoscener "Bigmama"
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Maybe this is the common pcmcia conflict with 8MB ram in 24-bit space... Do you have anything in the pcmcia slot?
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21 September 2020, 20:18 | #12 |
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I do - I have a CF reader. Can't remember if I had it in or not - don't think I did? I can definitely test this but would rather do a few things in one go as I don't want to keep pulling it in and out.
Also, I thought 3.0 didn't have the same issue as 3.1 when it came to 8mb ram? I did buy it as faulty though... |
21 September 2020, 21:06 | #13 |
ex. demoscener "Bigmama"
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yes and no - the issue is with pcmcia ram-expansions and >4MB in trapdoor simultaneously causing a hardware conflict. kick 3.1 tries to "fix" that by disabling pcmcia even if the card is not a ram-expansion.
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05 February 2021, 20:00 | #14 |
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So - found an 8mn SIMM in the cupboard the other day that I had forgotten I had, swapped it with the one that came in the ram expansion ang guess what - worked fine! So obvious...doh!
Have no confirmed that 3.0 works fine with 8mb and even managed to get Classic Workbench working by typing LOADWB when the startup script fails and a few cancels. Then you can mount CF0: and it works (not pretty but works). |
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