Hello all,
recently I bought a CSA Turbo Amiga CPU (only the accelerator, without RAM expansions... yes I know....). The guy who sold it said it was working fine on their A2k rev3 and rev4 might need some adjustments.
I have both rev4.4 (full ECS, not of great use though) and rev6.* (no mods) and:
- in rev.4.4 it does not even start up, moves from green screen (bad ram) to yellow to finally blue or red (used to be red, now always blue)
- in rev6.* it does start up, but the card seems to be undetected / unused, when I try to run SysInfo (v3 or v4) it simply hangs, no info shown
Some of the LEDs in the card flash, so it is not dead, BUT I just noticed that all PALs overheat a lot. Each chip has a ceramic capacitor in front, either 1mF or 811pF (this one not so sure). I wanted to see if the overheating, more in some chips than others (even in the same row), was caused by a broken capacitor (my kinder-garden multimeter was of not much help with the capacitors still in the circuit) so I replaced one of the 1mF (I used a electrolytic one since I do not have ceramics), but the chip overheats as much as before.
So, before I go for a mass recap, with my ridiculous soldering tools and skillset, I would like to ask if anybody might have any idea about the root cause of this (even in general terms, regarding lot of chips overheating).
Could it be that once damaged, for whichever reason the chips originally overheated, the chips will just overheat and not operate?
Also, does anybody know if any big change from A2k revs 4 to 6 was done that could affect how such an old accelerator would operate in a rev6?
Of course if anybody requests, I can upload as many photos as needed, although the ones in TBBOA are pretty good already.
Thank you so much in advance!
recently I bought a CSA Turbo Amiga CPU (only the accelerator, without RAM expansions... yes I know....). The guy who sold it said it was working fine on their A2k rev3 and rev4 might need some adjustments.
I have both rev4.4 (full ECS, not of great use though) and rev6.* (no mods) and:
- in rev.4.4 it does not even start up, moves from green screen (bad ram) to yellow to finally blue or red (used to be red, now always blue)
- in rev6.* it does start up, but the card seems to be undetected / unused, when I try to run SysInfo (v3 or v4) it simply hangs, no info shown
Some of the LEDs in the card flash, so it is not dead, BUT I just noticed that all PALs overheat a lot. Each chip has a ceramic capacitor in front, either 1mF or 811pF (this one not so sure). I wanted to see if the overheating, more in some chips than others (even in the same row), was caused by a broken capacitor (my kinder-garden multimeter was of not much help with the capacitors still in the circuit) so I replaced one of the 1mF (I used a electrolytic one since I do not have ceramics), but the chip overheats as much as before.
So, before I go for a mass recap, with my ridiculous soldering tools and skillset, I would like to ask if anybody might have any idea about the root cause of this (even in general terms, regarding lot of chips overheating).
Could it be that once damaged, for whichever reason the chips originally overheated, the chips will just overheat and not operate?
Also, does anybody know if any big change from A2k revs 4 to 6 was done that could affect how such an old accelerator would operate in a rev6?
Of course if anybody requests, I can upload as many photos as needed, although the ones in TBBOA are pretty good already.
Thank you so much in advance!
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