hi guys, do you think it is possible to adapt this ram expansion module on apple II europlus?
Basically not feasible. That is a //e extended 80 column card, or at least a clone of it. It is designed to fit in a //e AUX slot, which a EuroPlus does not have. Most of the circuitry to drive it is in the //e MMU chip, which is why there are only a couple 74LS TTL chips in addition to the RAM on the card. Without the equivalent of the MMU, there is no way to connect the memory to the CPU.
Basically the best you could probably do is pull the RAM chips off and put them on a card designed for a EuroPlus... but that's not really worth the effort and in most cases not possible. Most of the currently available cards like the Saturn 128 Reboot or the Hyperion 512 + Clock that will work in a ][+ style machine use more modern RAM chips.
Thank you so much for your clear explanations
I wanted to increase the ram because programs like adt 2.1.0 or others do not start
and adt 2.1.0 bootstrap gives me this error message (BF04- A=01 X=D4 Y=05 P=30 S=E1)
I also tried to test the ram but I think it is good and it is only a problem of little ram available
What you probably need is a 16K "Language Card". That plugs into slot 0, and bumps memory up to 64K from 48K. It is necessary to run most versions of ProDOS and ADT Pro is a ProDOS app I think.
This is what a typical 16K RAM card for a ][+ or EuroPlus looks like:
You can also use a Saturn 128 style memory card in Slot 0. Clones of those are still being made by David Mutimer and Ian Kim and others. They give you a little more memory (addiitional 128K or more + the base 48K) but programs have to support it -- it isn't the same as //e AUX memory -- different bank switching scheme.
Oh... I should also mention on those 16K RAM cards, the ribbon cable goes to where one of the 4116 DRAM chips goes on the motherboard, usually the one at the rear row nearest the power supply. This is so the DRAM chips on the card can be refreshed along with the motherboard. One of the advantages of using a Saturn style card is they have their own refesh circuitry so no ribbon is necessary. A lot of the newer "reboot" cards use modern SRAM or SDRAM which doesn't need external refresh signals at all.
There is a DOS3.3 version of ADTPro also that you can use in a 48K machine.
Good to know, but his computer will really be a whole lot more useful if he expands it to at least 64k because so many other things either require it or work better with it.
yes, that works for me adt 2.4 dos, even if it only supports transfer with serial cable not with aux cable
Yes, that's my purpose