DKB Megachip on A2000: PAL/NTSC issue, help needed

[Xanxi]

I have done that exact swap and it worked just fine so it might be an issue with your new Agnus or maybe the MB. The 8375 ones are hard coded to either PAL/NTSC so once you put the PAL chip it it will default to PAL (irregardless of your jumpers). You can then change in the early stratup or in workbench if required.

Well, that's what i call an old thread digging :-D

I am not using this A2000 anymore for now but i am planning to revamp it in a few months.
Would you have th exact reference of your 8375 Agnus for further upgrade (picture maybe)?
And can you confirm you have the DKB Megachip with clipped Agnus and not the Mini Megi with soldered Agnus?

[slayer]

When I installed my mega chip I always attached to the gary chip not the cpu

[VingtTrois]

hmm I'm confused by this thread (i'm a little slow) so what do I need to have the Megachip work in BOTH PAL and NTSC? Thanks

I suppose only AGNUS "VBB" can switch PAL/NTSC...

[desantii]

I know I had apicture somewhere so I will look for it, it was the megachip with socketed 8375
 
swaped this one (from an NTSC megachip)
Agnus (2 MB) 8375 318069-11


To this one (to try to create a PAL megachip)
Agnus (2 MB) 8375 390544-01

Well, that's what i call an old thread digging :-D
 
I am not using this A2000 anymore for now but i am planning to revamp it in a few months.
Would you have th exact reference of your 8375 Agnus for further upgrade (picture maybe)?
And can you confirm you have the DKB Megachip with clipped Agnus and not the Mini Megi with soldered Agnus?

[Xanxi]

I know I had apicture somewhere so I will look for it, it was the megachip with socketed 8375
 
swaped this one (from an NTSC megachip)
Agnus (2 MB) 8375 318069-11


To this one (to try to create a PAL megachip)
Agnus (2 MB) 8375 390544-01

I do not remember precisely, but according do what i wrote in this thread, i used a 8375RO 390544-01 from my A500 Plus with no success.

Is 8375RO so different from a 8375?
Where did your chip come from?

[Zac67]

According to alexh's extensive studies, you have to stick with the '6-2' code as to which exact Agnus type you have/need. The four digit code + A/B/AB is not exact enough.

There are three different Agnus pinouts (A500/2000, A3000, A500+/600) and you'll have to get the exact type compatible with your chipram extender.

According to alex, 318069-11 is an A500+/600 type as is the 390544-01 - so if it doesn't work it's broken.

[Xanxi]

According to alexh's extensive studies, you have to stick with the '6-2' code as to which exact Agnus type you have/need. The four digit code + A/B/AB is not exact enough.

There are three different Agnus pinouts (A500/2000, A3000, A500+/600) and you'll have to get the exact type compatible with your chipram extender.

According to alex, 318069-11 is an A500+/600 type as is the 390544-01 - so if it doesn't work it's broken.

That's really peculiar because the A500 Plus Agnus that didn't work in the Megachip is working fine in the A500 Plus where it belongs :-/

[desantii]

When I did teh swap mine came from an A500+

[Xanxi]

I will give it another try in some weeks then.

[CLS2086]

Hi, be sure to have all "lastest" NTSC ECS chips rev.
And don't forget the "timer" jumper.

[Zac67]

That's really peculiar because the A500 Plus Agnus that didn't work in the Megachip is working fine in the A500 Plus where it belongs :-/

Really strange. However, there have been reports that "A500+"s were produced with an older board rev and 1 Meg Agnus (just Kick 2.0 to justify the "+") - might this be one of those, ie. not capable of 2 Meg chipram? Otherwise I have absolutely no idea, sorry.

[rkauer]

Not strange at all.

As said before, even on this thread, the 8375 Agnus chips are hard-coded to either PAL or NTSC. Also, you can only swap a -11 type Agnus (NTSC) for a -10 Agnus (PAL). Another type of Agnus will not work at all as they have different pinouts. Period.

------------------

Now, for the battery leakage, drop some lemon juice or spirit vinegar over the affected area, let it over for a few minutes, absorb the moist and clean the area with IPA and cotton buds.

 If a trace is exposed, put some transparent nail varnish over it to protect the area.

[Xanxi]

Not strange at all.

As said before, even on this thread, the 8375 Agnus chips are hard-coded to either PAL or NTSC. Also, you can only swap a -11 type Agnus (NTSC) for a -10 Agnus (PAL). Another type of Agnus will not work at all as they have different pinouts. Period.

------------------

Now, for the battery leakage, drop some lemon juice or spirit vinegar over the affected area, let it over for a few minutes, absorb the moist and clean the area with IPA and cotton buds.

 If a trace is exposed, put some transparent nail varnish over it to protect the area.

So, i were right all those years Problem is i never found a -10 Agnus to replace my - 11.

Do not worry about the battery, this mobo has burnt one year after the initial post of this thread and has been replaced by a brand new

[magnetic]

Hey guys fyi there is really nice like new DKB megachip NTSC 2mb for sale on ebay right now!

http://cgi.ebay.com/Amiga-DKB-MEGACHIP-2mb-Video-Ram-Upgrde-a500-a2000-CDTV-/320590304295?pt=LH_DefaultDomain_0&hash=item4aa4abd427

[Xanxi]

Hi.
I just wanted to say that, after seven years, i have finally swaped the Agnus chip on my DKB expansion to a 318069-10, and this time it is working perfectly as PAL, without any glitches.
I was right from the start.
:-)

[dougal]

I don't know if it helps but recently i installed a 8372 in my A2000 to replace the 8371 and suddenly my A2000 became NTSC.

I take it the Agnus was an NTSC version ?

Anyway there are some jumpers which i set and the A2000 became PAL again.

If you want i can see if i still have the guide i used.