Re: EPROM speed question

[Vlad Lungu <vlad@main.rls.roknet.ro>]

On Sun, 22 Feb 1998, Georg Hager wrote:

> Hi all,
> 
> I have managed to get a 16k boot image run from a floopy -- everything
> works fine. After burning the image.rom into a 27128 EPROM and plugging it
> into my NE2000 clone (yes, it allows 16k), the client didn't recognize the
> presence of the PROM and booted from the local disk. With DEBUG I found
> out that the PROM did not appear at the memory location I had specified in
> the NE2000 setup (D8000); all it reads there is 0xFF. If I remove the PROM
> from the card, DEBUG reads 0x80 from those locations.
I've had the same problem with an el cheapo NE2000 clone. I was burning an
8k image into an 2764, and since the card didn't supported 8k proms I've
set the card to 16k PROM size. After 2 days of hair pulling, I 've
configured by mistake the cord for 64k PROM's and voila! everything was
OK. It seems that some clones doesn't actually support 16k PROMs, so you
should try setting the card for 32k or 64k PROMs even you have a smaller
one. Anyway, it worked for me. BTW, the PROM was 200ns.
Good luck,
	Vlad