Problem Upgrading Apollo 1240

[emufan]

i agree, 126R - those ole eyes ...

[Amicol]

Originally Posted by supaduper

Yeah it goes to R on 126R

I agree

I've ordered SMD 22pF capacitors and 27R resistors, don't know if replacing all these will fix the problem, but it's a start

[emufan]

Ian Stedman (eab member too ) wrote on his website about it too, related for Apollo cards ( scroll down ca. 20 % on website ):

Locating E123R/E123C and E125R/E125C (Apollo cards only)

These components to remove are on the underside of the PCB.
The two components you need to remove are highlighted
Note: It does not matter if you remove either the resistor or the capacitor, removal of either part will fix the timing issue.

123R is in place, 125C and 123C removed. so the repair of 123R on your board is a good start

[ShK]

Originally Posted by Amicol

After looking at this picture (from the link you gave me), I'm not so sure that it does go there.
Have a look and see what you think?

Attachment 38156

Oh, that's my Escom A1200. I took that picture also of a mobile phone (Nokia 808).

http://eab.abime.net/showpost.php?p=879911&postcount=23

[emufan]

with that 41 MP monster, you can make that photo from your neighbours flat

[Amicol]

Originally Posted by ShK

Oh, that's my Escom A1200. I took that picture also of a mobile phone (Nokia 808).

http://eab.abime.net/showpost.php?p=879911&postcount=23

You must have a far better mobile than me!!

I see you had issues with the ACA1232, my board won't even boot with the Apollo attached!

[Amicol]

Replaced E123R & E125R, still waiting for the capacitors to arrive.
However, according to some websites, it now conforms to the Apollo timing fix (ie. E123C & E125C removed).
It still does not boot with the Apollo 1260 attached ( black screen).
I noticed something on a YouTube video when someone turned on their Amiga 1200, it took about 10 seconds to get to the boot screen (no HD attached) from power on, mine takes 37 seconds!
Is there something more serious wrong with my motherboard? It seems far too long...

Update: also something else, it boots in NTSC (it is a PAL Amiga). Very strange
(Measured 1v going to PIN 41 of Alice)

Now removed R203 and it's back to PAL. Still takes 37/38 seconds to bring up the 3.1 ROM boot screen

[Amicol]

Replaced E123C & E125C, the hard drive did try and boot a couple of times. Now it doesn't, but you can see the screen flicker every 5 seconds or so as if trying to start

[cpiac64]

boot from floppy or boot without startup-sequence

[Amicol]

Originally Posted by cpiac64

boot from floppy or boot without startup-sequence

Thanks bud, tried that but it doesn't get that far now, just black screen flicker ever 5 seconds or so. No life in hd, or floppy.

Every now and again it will try, one in 30 tries, but ends in guru meditation. I must be getting closer with timing. Not quite there

[Loedown]

Originally Posted by Amicol

Replaced E123R & E125R, still waiting for the capacitors to arrive.
However, according to some websites, it now conforms to the Apollo timing fix (ie. E123C & E125C removed).
It still does not boot with the Apollo 1260 attached ( black screen).
I noticed something on a YouTube video when someone turned on their Amiga 1200, it took about 10 seconds to get to the boot screen (no HD attached) from power on, mine takes 37 seconds!
Is there something more serious wrong with my motherboard? It seems far too long...

Update: also something else, it boots in NTSC (it is a PAL Amiga). Very strange
(Measured 1v going to PIN 41 of Alice)

Now removed R203 and it's back to PAL. Still takes 37/38 seconds to bring up the 3.1 ROM boot screen

Look at the reset circuit, capacitor leakage can cause odd effects and I had an A600 that took 8 minutes to boot, open circuit resistor.

[Amicol]

Capacitors are brand new, so shouldn't be that. I changed the roms to 3.0 and it boots in about 10 seconds. Must be something to do with 3.1 Roms

I will follow the other thread and try the ACA1232 fix, see if it works with Apollo too...

Starting to regret getting an Apollo

[emufan]

the behavior of 3.1 is normal - they changed the boot-delay compared to 3.0. you can find many postings talking about that feature.

above i posted a link of steady (!?) ( ian stedman ) - about timing fix related to apollo 1260:

Originally Posted by emufan

Ian Stedman (eab member too ) wrote on his website about it too, related for Apollo cards ( scroll down ca. 20 % on website ):


123R is in place, 125C and 123C removed. so the repair of 123R on your board is a good start

did you saw this?

the Apollo is one of the fastest card for the Amiga (overclocking) - so dont regret it - it is know for its "instability".
once you get that sorted - you will enjoy this card. dont give up too soon

[Amicol]

Hi Mate,

started a new threat on the subject of 1D4 timing fixes, in the hope of catching passing traffic. There might be someone else who has already solved this problem.
http://eab.abime.net/showthread.php?t=71851
I'll keep this one going when I get round to repairing the 'broken' upgraded 1240.

I'm still trying, even got it to boot using the Apollo floppy boot disk. However, it only boots on in 20ish tries, then freezes anyway. Must be getting closer

When I'm done I'll sell one of the Apollo's to recoup some money.....

[Amicol]

We'll this upgraded Apollo still does not work, not a clue what's wrong.

Stachu100 is going to take a look for me, good man!

[emufan]

good news. he will for sure blow some life in your card
happy holidays.

[Amicol]

Update: he's repaired the card and upgraded to 80mhz!
What a hero!