Re: Looking for data*** for Toshiba D455C and D546C391

From: Franc Zabkar (fzabkar_at_optussnet.com.au)
Date: 02/22/05 

Date: Tue, 22 Feb 2005 17:10:04 +1100

On Tue, 22 Feb 2005 05:37:46 GMT, "Koko" <a@b.c> put finger to
keyboard and composed:

>Hi, I'm looking for datasheets for a Toshiba d455c and D546c391 found on a
>20-year old board. Does anyone have any information about these or know
>where I should look? Thanks in advance for any help you can give.

Try uPD455C (is there one digit missing?) or CD4555??? The second one
could be a uPD546C. Is it a 40-pin CPU or microcontroller? If so, then
I suspect it is ROMed - the 391 suffix would be the firmware ID.

BTW, are you sure these are Toshiba chips and not NEC?

Just in case the first number was a typo:
http://www.ee.washington.edu/stores/DataSheets/cd4000/cd4555.pdf

- Franc Zabkar 

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