Introducing ACA 1221 Low Cost Accelerator At AmigaKit.com

[Schoenfeld]

So this may be a heat-related problem. Please make sure that your PSU is really supplying 5V, not more, as that will only cause excessive heat with no other benefit. Next, you can try to operate the computer without the trapdoor, which will give the CPU a little more air to breathe.

Jens

Just for reference, my ACA1221 is running at full speed (28mhz) for the last few days in a standard 1200 case and I've not had any problems or lockups with it at all.

[CrashMidnick]

Working fine here on A1000 with ACA500 straight out of the box

[Schoenfeld]

Originally Posted by emux

Just for reference, my ACA1221 is running at full speed (28mhz) for the last few days in a standard 1200 case and I've not had any problems or lockups with it at all.

Like I wrote: The voltage from the power supply makes a big difference: 0.1V too high, and you'll have too much heat for overclocking. There's a small potentiometer in A500/A1200 power supplies where you can adjust the voltage. However, you should only open a power supply if you have the education and tools to work on high-voltage equipment. If you don't, please don't put your life in danger!

Originally Posted by CrashMidnick

Working fine here on A1000 with ACA500 straight out of the box

...until you try to run the ACA1221 software! That's the part that does not work yet. We're working on a flash update for the ACA500 that will make the ACA1221 tools compatible. For the record: Don't set the trial jumper on the ACA1221 before we have the ACA500 flash update. You will lose valuable trial runs, and it won't work yet!

Jens

[CrashMidnick]

Thanks Jens for the advice. Maprom is working here so everything is fine for my good old A1000, your cards are doing a good job together.

Originally Posted by Schoenfeld

Like I wrote: The voltage from the power supply makes a big difference: 0.1V too high, and you'll have too much heat for overclocking. There's a small potentiometer in A500/A1200 power supplies where you can adjust the voltage. However, you should only open a power supply if you have the education and tools to work on high-voltage equipment. If you don't, please don't put your life in danger!

Thanks Jens, It works well with my power supply. It's a great little card for the price - ideal for WHDload games and Workbench is quite quick as well!

[Retrofan]

Jens some of us would like to have a new PSU supplying exactly 5 volts. You said you had something in the works.

Please.

[Lord Aga]

^ + 1 for this. We really need new PSUs.

[Dejavu]

Jens
Just for giving an idea: is there any posibility to implement cpu overclock (acatune' speed governing function) option directly into the ACA500 setup screens with forthcoming firmware?

[amiga1260]

I have lock up problems when I don't overclock it. I used the A500 4.5 A PSU, Apower II PSU 7 A and a modified PSU 300 Watts of Amiga kit. I know that the last two PSU's aren't recommended.

[Schoenfeld]

Originally Posted by Dejavu

Jens
Just for giving an idea: is there any posibility to implement cpu overclock (acatune' speed governing function) option directly into the ACA500 setup screens with forthcoming firmware?

Not for the ACA500, but possibly for the ACA500plus, as that also has the ability to change clock frequencies while running.

Originally Posted by amiga1260

I have lock up problems when I don't overclock it. I used the A500 4.5 A PSU, Apower II PSU 7 A and a modified PSU 300 Watts of Amiga kit. I know that the last two PSU's aren't recommended.

I think we're already in contact via e-mail - no need to discuss it in two places. Will post the solution here when we've found it.

Jens

[amiga1260]

I also solved my problem. I used the wrong Amiga 1200. This is the one which hasn't had the timing fix.

I tried it in my third Amiga 1200 and the reset issue is gone and this issue also doesn't happen on the ACA 500.

Thank you for your help.

[BertieWooster]

I have one of these cards on the way, but I am now a little concerned to hear about these timing issues. How common are they, does anybody have any idea?

[Arnie]

You need to check your motherboard. If you have any of these capacitors fitted then you may need to remove them. (Scroll down to 'possible required board modifications')

[BertieWooster]

Thanks Arnie, didn't notice that before. My Amiga won't be here for a couple of days, so I won't know until then. I suppose I'm sending it in to Amiga Kit if it has the dodgy capacitors.

Annoyingly, I suspect this may have been why my 030 accelerator didn't work properly in the 90s, and I ended up giving it away for free!

[trixster]

So is it the case that the timing fix needs to have been done prior to installing one of these boards?

In my Amiga 1200 it works excellent with all features enabled (RAM, CPU-Speed and Maprom).
Also the ACAGov or the ACAClock functions work great.
In my Amiga 500+ with 2 Meg Chipram with the ACA500 Card installed, just the Ram works. (Maprom and CPU Speed will be fixed as mentioned above).
But:
Many (larger) WHDload games do not work with the ACA 500 and the ACA1221 in my A500+ 2 Meg Chipram . It always quits loading with different errors!!! (e.g. Indy 3 and 4...) No difference if the internal ACA500 maprom function is enabled or disabled.
On the A1200 they work fine.
Hopefully this will be fixed with the new ACA500 firmware!!!

[CrashMidnick]

Some whdload games do not like ACA500 with an accelertaor fitted : alien breed 2 and flashback have graphic corruption for example. So maybe Jens Will fix this later. Tested with blizzard 1230 and aca1221. Without accelerator, the ACA500 play them just fine.

Yes, but the main sense of the ACA1221 for ACA500 users is that you will have more RAM I thought? The ACA500 without accelerator card has just 2Mb, which is for some larger WHDload games almost to less, and with the ACA1221 they don't work!

[amiga1260]

you can give your WHDLoad problems to the WHDLOAd team.

I found a bug with Gloom when I using an A1200 with ACA 1233/40 MHz. The problem was the walls disappeared. If I try the same game on a Blizzard 1230 IV I don't get this problem.

WHDLoad installed games won't work with all Accelerator cards. I also have some issues with games when running on a GVP 1230II.