Re: Trust ISA Ethernet (NE2000) anyone?

[markus@infoscape.com]

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Hi,

 > Our NE2000 image is 16k (using latest netboot, 0.5.4) but we
 > want to program on 64k EPROMS because these are half the price
 > of 32k ones, and 16k are just not available it seems.
 >
 > Firstly, is it possible to use the 16k image on a 64k EPROM? (Our
 > Genius NE2000 card seems to support 64k EPROMs.)
 >
 > Secondly, do they program the image at 0x0000 or 0xc000 in the EPROM?
 > You say, "top quarter" -- does that mean from 0xc000 thru 0xffff then?

A 27512 should be mostly compatible with a 27256. The only difference
is in pin 1, which is Vpp for 27256 and A15 for 27512. Your best bet
is probably just concatenating four copies of the image, burn it into
the 64k EPROM and then set your card to 16kB mode. This should work,
because a 27128 uses pin 27 as /PGM whereas the bigger EPROMs map A14
to this pin.

Good luck,


Markus

--
Markus Gutschke                         Internet: markus@infoscape.com
Infoscape, Inc                          Phone:    +1-415-537-3778
657 Mission Street, Suite 200
San Francisco, CA 94105

Disclaimer: The above message represents my personal opinion; It does
            not constitute an offical statement by Infoscape!

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