Hi Ryan!

Glad to do the writeup on your expansion, it was a process to cement
in my mind the procedure anyway. I was meaning to even take photos
and put them in, but was too much in a hurry to get the thing
together and working! Next time I open it up for another mod, I'll
take some and upload them.

Thanks for the tip about the Vcc and GND, I suspected that it might
be possible the way you said it, but I wasn't game to mess with the
ROM too much at the time.

Re: extra plug-in SRAM - I was actually planning sometime to mount a
socket in the cartridge bay of my SK-8 and wire it up parallel to the
internal SRAM, with all the resistors etc wired to it, and have the
CS and WE lines toggled for each chip, so you could have either the
internal RAM or the pluggable external one. The cartridge cover could
be made watertight and would keep liquids away from the chip.

I personally know of one other guy who has actually done your
expansion - "catweasle" from the circuitbenders.co.uk forum. I've
also had at least 2 others email me about specific details of the
process, one of them asking about my LED display, too.

Cheers, Graham




--- In CasioSK@yahoogroups.com, "plutoniq9" <Plutonique9@...> wrote:
>
> Hey Graham!
>
> Hey, great work on creating the word doc with illustrations for my
32x
> memory modification, only just noticed this today!
>
> One note regarding the VCC + GND for powering the new SRAM.....you
can
> easily just solder these pins to the VCC + ground legs of the ROM
chip
> sitting next to it without needing to drill through the board.
>
> One thing i wish i did differnetley (and what might need a
> daughterboard to accomplish), is to be able to easily remove the
SRAM
> if all the address pins & power etc. wasn't soldered directley to
the
> IC legs....that way (i believe) you could interchange/backup/ and
even
> directley burn new samples into SRAM without needing to record via
the
> SK's A/D converter (via Eprom Reader/burner). I might try adding an
> external ZIF socket on my SK-5 to accomplish just this.....but it is
> risky if water came in contact with it, could perhaps blow the
> CPU....so would need some sought of cover.
>
> Anyways, great work.....I wonder how many people have expanded the
> memory in their SK's so far?
>
> seeya
>
> ryan
>