On Tue, 24 Feb 1998, Peter L. Peres wrote: > Also, re: timing, The standard ISA bus is run at about 8 MHz, which is > 125 nsec. Every ROM access pulse I have ever seen took two of these > cycles, at least, and that is 250 nsec. That's exactly the reason why I assumed from the beginning that 200ns EPROMs should be fast enough... :-( > Also, there is a spec somewhere in the ISA papers that says that a BIOS > ROM extension should be 250 nsec, 200 nsec to be really sure (if an > extra buffer is used, such as on the netboot flashcard for example). The > only systems that may require faster ones, are overclocked ISA buses. I know, but the problem appeared even when I set my ISA bus timing to CPUCLK/6, which is between 5 and 6 MHz on my 486-33. After all I've heard now in this discusson, the whole thing seems to be a problem which is specific to my special combination of NE2000 clone and slow EPROM. Georg. ========================================================================= Georg Hager | Email: ghager@theorie3.physik.uni-erlangen.de Theoretische Physik III | Tel. (Uni): (+49)9131/85-8815 FAU Erlangen-N"urnberg | Tel. (Pri): (+49)911/735142 Staudtstr. 7 | Home URL: D-91058 Erlangen | http://theorie3.physik.uni-erlangen.de/~ghager/ =========================================================================
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