Re: ZIP to SIMM Adaptor
I suspected something like that. Would you have a few links to these free designs?
http://aminet.net/hard/hack/PS2_adapter.lha is the A3000 adaptor with image of the PCB you need to make.
Amifast cardwas a card made by Provtech but chances are you will see more of Kato's
simmfonie card.
Re: Z3 memory card:
What card exactly are you referring to?
The Commodore Bigram, it was made as a Z3 reference design back when the A3000 was launched to show CAT's developers how to design Z3 cards. The design was given away free and is still available from
the Dave Haynie archiveMore information on the card, including a picture, is available at
amiga-hardware.comNow thats the kind of technical hurdle I wanted people to tell me about. What exactly are CRE and ADV ?
They are specific to that chip I think, unlike normal ram you have to tell this when your not using it or if your running a burst cycle, these extra signals combined with the normal signals are used for that. Details are in the PDF of that memory chip you were talking about.
Normal Dram (And SDRam) havce RAS and CAS and thats it (SDRam add chip select, or BE, but they are just address lines)
Electrically, static memory chips seemed much easier to deal with than DRAM. However, soldering VFBGA (that's VERY FINE ball grid array...) chips would certainly be a true pain in the neck...
Well SRAM is, this ram you linked to isnt. SRAM is treated just like a ROM and is dead easy, everything is sorted inside the chip. Down side is SRAM is expensive and the memory you linked to would need extra chips to control it, just like DRAM does (Although not the same chip as the lines do different things)
DRAM is simple, you just have to split the address bus and load it into the ram half at a time (using RAS and CAS to tell the RAM what half is on the address bus at that time) and refresh the ram every so often so the contents are not lost.
Have a look at some of the Zorro 2 dram cards on amiga.resource.cx, there are some simple designs.
Zorro 3 just adds address and data latches and adds more memory.
I don't give a rodent's rump what it looks like, so long as it works.
:-? I want the Delfina lite, not because its the best card but because its sexy. :-D