alun@neabbs.UUCP (ALUN SAUNDERS) (06/01/89)
Hi there, A colleague of mine is having trouble adressing an encryption board installed in a 386 machine running XENIX/386. It works OK under DOS and can be got at by adressing a RAM buffer at D800:0. All attempts to find this lump of memory when running under XENIX seem to fail. I must admit, I'm a DOS type, so I don't have a clue as to what the problem might be, but I know the 386 can do some pretty strange things with memory mapping and the like. One thing that puzzles me is that it is an 8-bit card, i.e. only one edge connector, so wouldn't you get strange adress conflicts due to the fact that the card can only decode 20 bits of adress ? Come to think of it how does any 286 or 386 protected mode system cope with cards of this sort, such as video controllers or EMS cards for example ? So, if anybody can give me a hint as to what sort of things I should look at, I'd be grateful. Alun Saunders