[sdiy] Frozen DX7IID

[Rainer Buchty]

Hi Greg,

On Thu, 21 Aug 2014, greg at gzifcak.net wrote:

> I just replaced the RAM in my DX7II. I swapped the existing Toshiba 
> TC5564PL-15 chips for TC5564APL-15 since this is all I could find 
> available. I searched for info on the meaning of the suffix but 
> couldn't find anything.

>From a datasheet A/B comparison, the only difference I could immediately 
spot is the Output Data Hold Time tOH.

For the APL part it's 20ns min, for the PL part however 30ns min.

This is the APL datasheet:
 	http://pdf.datasheetarchive.com/datasheetsmain/Datasheets-X2/DSA627000177.pdf

And here's the 1983 databook including the PL part:
 	http://bitsavers.informatik.uni-stuttgart.de/pdf/toshiba/_dataBooks/1983_Toshiba_MOS_Memory.pdf

HTH,
 	Rainer