Apollo 1240

[DDNI]

Lo all just been given an Apollo 1240.

I stuck it in my miggy 1200 - result nadda - HD spun up and no more.

Took it out examined it.... NO OSCILLATOR!!

Holy Crap have I fried the board?

[BippyM]

Go buy an oscillator and you'll soon find out!

[DDNI]

Thanks what are my chances?



Is it any easy job to put one on?
AmigaKit have 50mhz ones for 3.99 - deal or no deal?

[BippyM]

well it's only 4quid. and the 040 should run at 25mhz with a 50mhz oscillator.. (If I remember rightly)

[DDNI]

thanks bippym

as I said, can a clumsy oaf like me solder one on?

[BippyM]

Only one way to find out isn't there

I presume it is only 3 or 4 pins so unless the holes on the apollo are blocked up should be easy enuff!

[DDNI]

lol true, whats difference between 8DIL and 14DIL?

http://amigakit.leamancomputing.com/...x.php?cPath=45

[BippyM]

One for the real experts methinks

[DDNI]

No worries mate! Thanks for your help.....

BRING ME AN EXPERT!!!

[PaulyQ]

I have exactly that card. And it's a fairly easy job with a steady hand, a magnifying glass and a few blobs of solder. Use a fine point on the soldering iron(put a touch of solder on the iron first and then dab it onto the connections).

[DDNI]

Originally Posted by PaulyQ

I have exactly that card. And it's a fairly easy job with a steady hand, a magnifying glass and a few blobs of solder. Use a fine point on the soldering iron(put a touch of solder on the iron first and then dab it onto the connections).

Thanks PaulyQ.... Do you reckon the card is fried though?

[PaulyQ]

there's always the possibility, but mine fell off and I soldereed it back on, this was after firing up the A1200(which didn;t boot) and then discovering the capacitor on the table.

So you've got a decent chance. For the sake of 1/2 an hour of your time and £3.99 for an accelerated miggy...I'd go for it m8!

[DDNI]

PaulyQ would you let me know the cpu speed and type of oscillator you have on yours?

[Smiley]

You can get oscilators from maplin for under a quid

[DDNI]

Originally Posted by Smiley1635

You can get oscilators from maplin for under a quid

Brilliant! Will call down tomorrow.
Just need to know which one to get! I know it needs to be 50mhz as the 040 is 25mhz and needs a signal at twice clock speed....

[Smiley]

I would check the website first, they seem to have a largish range.....

[alexh]

14-pin crystals are rectangular and 8-pin are square.

As you can see from this photo.

http://amiga.resource.cx/photos/phot...ile=Apollo1240

The A1240 has a rectangular 14-pin type.

Remember, get the orientation of the crystal correct, put it in the wrong way round and bang, you'll need another.

I'd consider getting a 66MHz crystal at the same time as your 50MHz one if you want to perhaps overclock to 33MHz?

[Jope]

Originally Posted by PaulyQ

put a touch of solder on the iron first and then dab it onto the connections.

I used to do it that way too, but I didn't get very good results.

I suggest starting with a clean soldering iron tip. It is also important to wait until the iron is fully heated. A wet sponge (one you don't use for anything else) can be used to wipe excess solder off the tip. Don't drop the hot solder balls onto your clothes/skin, however.

Once you have a nice hot iron with a clean tip, take the iron to the component you want to solder.

Wait a few sec so that it heats up (not much more, you'll start lifting traces off the board soon), then apply a tiny bit of solder with your other hand (only a few mm's).

Remove your iron and let it cool. Don't blow on the hot blob of solder or you'll get a bad joint.

The important bit to remember is, that the solder will not stick to the component unless it is heated. Thus it is best to heat it first, then apply solder so that it goes directly into the right place (ie. where there's hot metal).

[keropi]

X Mhz Osc. = X/2 Mhz 68040...
for ex:
50 Mhz Osc. = 50/2=25 Mhz 68040 ...

get a 66 Mhz one, it will work 90% .... remember to put a heatsing/fan on the 040!

[PaulyQ]

Thats one thing I'd never considered... o/c the crystal/CPU.... I know the Amiga can be a bit funny with timings and is very much knitted together pretty well. I haven't had the chance to get to my Amiga as yet as the wife has just had our first born, so things are pretty hectic. If I can, I'll try and dig it out sometime today and post up a picture of mine so you can get a good idea of where the bits should go and the orientation. Would that help ?