MAMEWorld Forums - EmuChat

> This is in reference to: http://mamedev.org/source/src/mame/drivers/wiz.c.html
>
> Sorry if I'm posting in the incorrect place. I'm new and trying to figure this forum
> and the ways things are done here.
>
> In there it states this: - There is unknown device (Sony CXK5808-55) on the board.
>
> I've been searching for info on this IC and have found it in the Ghosts n Goblins
> schematic.
>
> It is a 1k x 8 RAM (I'm not 100% sure if it's considered bipolar or static...) in a
> 22 pin package. It's not in ChipDir or out on any of the datasheet sites I've found
> yet. Sony has no old datasheets on it either.
>
> The pinout is this:
>
> A6 - 1 22 - Vcc
> A5 - 2 21 - A7
> A4 - 3 20 - A8
> A3 - 4 19 - A9
> A2 - 5 18 - /CE
> A1 - 6 17 - /WE
> A0 - 7 16 - D7
> D0 - 8 15 - D6
> D1 - 9 14 - D5
> D2 - 10 13 - D4
> Gnd- 11 12 - D3
>
> It's funny... Capcom used only 256 x 8 in that chip. The upper 2 address lines are
> grounded.

Thanks for bringing this issue to my attention.

This is also used in system1.c.
http://mamedev.org/source/src/mame/drivers/system1.c.html

Agreed that going by the numbering scheme for Sony part numbers in this series, it should be 1K x 8-bit. Still, not guaranteed.

Every other chip in that series is CMOS Static RAM.

Guessing "55" is the access time (55ns) - available online from Asian part resellers seem to be -45, -50, and -55 versions.

22-pin packages don't seem to be available in the rest of the series, although you do see it in the 4-bit CXK54* series. However, I looked at a few of those and the pinouts are different.

Thanks for working out the pinouts, this will probably be added to the source or at least to Guru's/The Dumping Union's chip documents, if it isn't there already. (Well, it's RAM, so it's not normally needed to be dumped, etc.)

I'll eventually check out a few other sources I have access to for datasheets, but yes - so far, nobody has the datasheets.

PS. I found this auction in case you need to buy some:
http://page2.auctions.yahoo.co.jp/jp/auction/b121957758
Rinkya: http://www.rinkya.com/new/en/auction-b121957758

- Stiletto

Edited by Stiletto (09/02/11 11:11 PM)