Aca500+ 2mb chip ram

More chip ram requires the Agnus to be changed for the latest ECS version. Since Rev.5 of the motherbaord cannot take that directly (and would not have the required amount of RAM on board), the only way to avoid tedious and error prone soldering would be to get our ACE2b product.

Hallo Jens,

ich habe einen Amiga 500+, Rev.8A.1, FAT AGNUS 8375 mit ACA 500 Plus & ACA1221EC.

Kann ich das mit 1 oder 2 A512 kombinieren, um auf 1,5 oder 2mb Chip-RAM zu kommen?

Danke!

Hello Jens,

i am owning an Amiga 500+, Rev.8A.1, FAT AGNUS 8375 used with ACA 500 Plus & ACA1221EC.

Is it possible combining 1 or 2 A512 to realizing 1,5 oder 2mb Chip-RAM?

Thank you!

If that's a "real" A500+ with RTC on-board, then yes, any 512k trapdoor expansion will take you to 1.5M chip ram. So if you already have one, you can use it. The A512 will let you use that same 512k trapdoor epansion together with the A512 to form the full 2M chip ram.

If you don't have any trapdoor epansion in your collection yet, then the A2048 does the same as two A512 cards, but for a slightly lower price.

It doesn't come with a RTC on-board and it contains only 4-RAM -Chips (HYB514256B-70) => 512kb?

So it isn't a real A500+?

So the A2048 is the right choice for my to used it with ACA500Plus?

Sorry, I like my Amiga very much, but I am far from being a specialist.

Thank you!

The A2048 works perfectly for me. I also have a Rev.8A-Board which is NOT an A500+. A few little solder work and you'll have 2MB chipmem!

Quote from Borsalino

It doesn't come with a RTC on-board and it contains only 4-RAM -Chips (HYB514256B-70) => 512kb?

So it isn't a real A500+?

The A512 has two use-cases: As a 512k expansion in a non-plus-A500, and as one of two 512k expansions in a "plus" version of the A500. Note that the second 512k expansion can be "any expansion" that also fits the A500. It's a special property of the A512 that it can work together with older 512k expansions.

Quote from Borsalino

So the A2048 is the right choice for my to used it with ACA500Plus?

The ACA500plus is a CPU/memory/IO expansion, and you've asked for trapdoor expansions. These are different things. Let's focus on one thing at a time, solve it, then jump to the next topic, especially if names are confusingly close to each other (A500plus is the main computer, while ACA500plus is the external expansion, independent of the host board revision).

Yes, i got the difference between A500+ and my ACA500+.

My question is more like: Does the ACA500+ have any problems with ChipRam >1mb or does it work together?

I am sure it´ll work, because your products are awesome!

But ok, lets focus on the A2048 and my 512kb-Rev 8A1-A500+ (not complete A500+)

Am i adding the A2048, following instruction-/installation-manual, and i am going to get 1,5mb of Chip-RAM or 2mb of Chip-RAM? (i´m fine with both options)

Do i need to install additional:

U9 - Clock - OKI M6242B

U32 74G139PC

U16-U19: 4256-70-RAMs

D911

D912

R911

R913

or is it optional for 2mb

or not necessary with A2048?

Quote from Borsalino

Does the ACA500+ have any problems with ChipRam >1mb or does it work together?

No problems - the config is widely in use and was in our tesxt loop during development.

Quote from Borsalino

Am i adding the A2048, following instruction-/installation-manual, and i am going to get 1,5mb of Chip-RAM or 2mb of Chip-RAM? (i´m fine with both options)

You will get the full 2MBytes of chip ram.

Quote from Borsalino

Do i need to install additional:

U9 - Clock - OKI M6242B

U32 74G139PC

U16-U19: 4256-70-RAMs

D911

D912

R911

R913

Display More

No - these are only necessary for making it a "full A500+". You can (optionally) use an RTC module on the A2048, or install the components on the main board, that's up to you, but memory-wise, you only need to follow the steps that are described in the Wiki. As described in the linked Wiki article, you are disabling the on-board 512k. You may as well remove the chips if you have a better use for them.

Thank you very much!

I still own your RTC-Modul on my ACA500+.

Maybe you like too add these helpful informations to discripition of A2048?

Summary:

Adding the A2048, following instruction-/installation-manual, memory-wise, you only need t o follow the steps, that are discripted in the linked Wiki article of A2048.

You are disabling the on-board 512k/1024k.

You may as well remove the chips, if you have a better use for them.

You will get the full 2MBytes of chip ram.

It is working with ACA500+.

Following modifications are only necessary for making a Rev.8a a "full A500+".

For using a A2048 you do NOT need to install additional:

U9 - Clock - OKI M6242B

U32 74G139PC

U16-U19: 4256-70-RAMs

D911

D912

R911

R913

(if complete, otherwise: etc.?)

Imho, the product description already answers all these questions. It's just that you've asked for confirmation a number of times, probably seeking some kind of "trap". We get that every now and then, and I don't see a need to overload the product description over and over again. I believe that "A2048 gives you 2M Chip ram with very little soldering", plus the added info in the Wiki, are enough of a clear description.

More text will only result in "wall of text, didn't read", which is the even bigger danger.

Oh, no i´m trusting in you, believe me!

Today i wanted to install A2048. but i think my Amiga wants to drive me crazy... or has a serious problem.

I turned it on, my Indivision ECS V2 shows up, but the my dispaly is staying black, Floppy is staying silent and Power- & Floppy-LED are glowing slightly, only.

I tryed 3 Powersupplys and 2 of 3 showed -12v,+12v and 5V, correctly.

I removed ACA500+, my old 512kb -expansion => so i restarted without any expansions, except Indivision ECS V2, and 512kb (onboard only).

Same:

I turned it on, my Indivision ECS V2 shows up, but the my dispaly is staying black, Floppy is staying silent and Power- & Floppy-LED are glowing slightly, only.

So i don´t know how to check what kind of hardware problem my Amiga might have.

Are you offering this kind of service or are you having an advice or contact who does offering this kind of service?

Thank you!

We can't offer service on retro computers, but we can provide some basic steps for diagnosis here. The first question is of course: When did this machine work last time, and did you chance anything in between?

It hab been turned on about a year ago.

It was stored until yesterday.

I have plugged in powersupply, display, ACA500+, mouse, again and turned Amiga on. (my last working setup)

My Indivision ECS V2 shows up, but the my display is staying black, Floppy is staying silent and Power- & Floppy-LED are glowing slightly, only.

You've mentioned that you have a Rev.8a board: Has this ever been equuipped with an RTC and rechargeable battery? Many of the "full" A500+ boards suffer from leaking batteries.

Other than that, I'd check sockets, just remove and re-seat chips to make sure they have good contact. Depending on where on the planet you are, you may have salt in the air (near a coast for example), which may recult in faster corrosion. Re-seating the chips might already do the trick. Be especially careful on the Agnus socket - it's very delicate and should only be worked on with proper tools.

I am based in Duisburg.

My Rev.8a come without battery and 512kb only.

Ok, than i am going to follow you advices thankfully.

Isopropanol is the right choice for cleaning contacts?

Thanks a lot!

Quote from Borsalino

Isopropanol is the right choice for cleaning contacts?

Yes - that, and an old toothbrush. Re-insert the chips while they are still wet, this will also help making good contact, especially the Agnus chip.