Betriebssystem: Suche Eprom info

[rv8flyboy]

.... und Spansion sagte: Es konte ein 2764 sein da es 28 pins hat...

BWAHAHAHAHAHA und was ist mit 27128, 27256 und 27512....... ???

[rv8flyboy]

Okay Rubin

progress at last

habe hier mal zamtliche emails geschickt und hier ist ein interesanten antwort:

Gert,
Thanks for the email.
The part does indeed appear to be made by AMD. The 8732QM is the date code.
I believe it to be an AMD AM27128 of unknown speed. It is unlikely to be a CMOS part (as AMD did not start making these until about 1986, and their die looked a bit different)
Any non-CMOS 27128 of sufficient speed should then work.
On a 27128 pins 2-10, 23-25, and 21 (13 pins in total) are address lines and thus should go to the 40 pin DIP beside it (which is an Intel 8051 type device)
Hope this helps,

John Culver
Curator
The CPU Shack Museum
john@cpushack.com
 CPU Shack Blog

und, zur meiner frage ob es ein 27256 sein konte:

Gert,
It could be a 27256, I just didnt see one with a similar die in my collection. A 27256 would have 15 address lines. It is also combines the PGM line with the CE line.
The one on your board has pin 27 tied to pin 28 (which is VCC). This pin on a 27256 is A14
I made a mistake on my last email the 27128 has 14 address lines (I forgot pin 26) but regardless, if the chip on your board was a 27256, its capacity would be limited to 128k by the fact that pin 27 is tied to VCC
The date code 8732QM is translated YYWWLL, 87 is the year, 32 is the week, and QM is a lot code.
On the back of the EPROM may show the country it was assembled in, and another date code. (or it may be blank)

John Culver
Curator
The CPU Shack Museum
john@cpushack.com
 CPU Shack Blog