Blizzard IV 1230 MK won't work

[sirkope]

Hello everyone,

Recently I've bought an amiga 1200 with a Blizzard IV 1230 MK turbocard with 8MB Ram but no math coproc. I used it with this way without any problem, till I bought an 68882/40MHz coproc. (68030 runs with 50MHz) I've started to use but the amiga had frozened about 20-25 min work. After 4-5 times I've bored it and removed the coproc. The machine seemet to work longer then with coproc. till it reached about the 45. minutes. Then it had frozened again. Since then it can't run with the turbocard, only if I remove/disable it.
When I start the amiga, the blue lines (turbo card self test) appeared, but when it turns to the hdd/fdd it stopped with a black screen, and thats it?

Any idea?

[vic20owner]

Make sure the shielding inside the A1200 is not touching either side of the board.  Sometimes when you are typing on the keyboard, it will press down on the shielding and ground out the 1230.

Bending the shielding up a little will fix this sort of problem.

[sirkope]

It seems to me, that it lays on the plastic edges of the case and doesn't "touch" anything else. Could the motherboard cause this? I've read a hack which solved some kind of unstability with an apollo turbo card.

[Andeda]

Hi, just try to clean the connector which connects the accelerator to the motherboard,  this was the solution for me, i had the same problem when i bought my accelerator.

[vic20owner]

It seems to me, that it lays on the plastic edges of the case and doesn't "touch" anything else

Check the shielding above the motherboard connector... when you push the card in, that shielding is above the card (between it and the keyboard) just above the card's connector. You can't see it at that point.

Sometimes it just barely touches, grounding out the card when you touch the keyboard.

It's hard to see but worth checking.

Had this problem nearly every time I installed an Apollo 1230.

My microbotics doesn't have as much exposed area to make contact.

Placing a strip of tape over the wires where they exit the black connector on the board is an quick way to test if this is the problem.

[sirkope]

I can't clean the edge, and the connector (yet) 'cause I haven't got 'contact spray' at home, (tomorrow I'll take one) but I've tried placing a strip of tape not just for the connector, but the memory bank part. But didn't work

[rkauer]

 You can use isopropyl alcohol to clean the contacts (the same "magic potion" found on floppy-disk/CD cleaners).

 Rub some with a smooth cloth.

 That's it.:-)

[sirkope]

I've cleaned both, but doesn't work

Im afraid some part of the card had overheated

[CLS2086]

Hi,
stupid question, do you have a SUPER PSU that bring you more than 100W or do you use the A500 (50/60W) PSU ? ;-)

[rkauer]

 I'm pretty sure you had fried the coprocessor (40Mhz) when inserted it in board (buy a 50 MHz version, '882 are very sensible to overheat).

 Did you install some kind of FPU library on your Workbench (in that case, remove the lib will do the trick)?

 Try also remove the battery from the board for a while to "erase" it's memory (I'm noticed the batt is soldered)...

[sirkope]

Hi,

I've heard that the original PSU of amiga 1200 is hardly enough for the machine itself even if you install additional equipments. So, because I've bought it without PSU, the first thing was to buy an amiga 500 PSU. I've never heard anything about SUPERPSU.

[sirkope]

Probably you are right, but I couldn't check my 68882, but I've bought as an 40MHz one tested 50MHz also from Vesaila Computer.

But the card crashed after that I removed the 68882.

No, I haven't install any FPU library, or at least deliberately.

I'll try remove the battery at afternoon.

Thanks the ideas.

[Chain]

im running my 882/40 clocked at 50mhz for many years, never had a problem

[sirkope]

I've run it without 68882 several times with no problem at all. But after I've installed the FPU, it seemed to me that the card overheated after 20-25min, and the machine reseted, and start to "jerk" the video signal, and generate strange noises. It was very scary. But a few minutes cooling, it can operate again normaly for another 20-25 minutes.
After 4-5 times I've bored it, and removed the FPU. Then it can operate about 40-45min, when suddenly the same effect occured, but after it the card stopped work at all.

[sirkope]

A new idea came up my mind, I haven't tested yet:

If I push both of mouse buttons, than turn on my amiga, a screen come up, where I can choose between booting devices, etc. Also has a page where I can see the installed equipments on the expansion port. I wonder if I see anything here ....