gnome@oliveb.UUCP (07/07/87)
in article <220@amanue.UUCP>, jr@amanue.UUCP (Jim Rosenberg) says: > Xref: oliveb comp.sys.att:644 comp.sys.ibm.pc:5146 > controller") outputs the two bytes to the bus **IN THE WRONG ORDER**!! That > means **ANY** 16-bit output instruction to a card on the bus will get the > bytes swapped. Software that does only 8-bit OUT instructions to the ports on > the EGA will work, but anything that does 16-bit OUT instructions won't. > -- > Jim Rosenberg Oh well, that is because it was built two years before the AT came out! If you are going to do 16-bit I/O's to an 8-bit device, something has to decide the byte-order, and when the 6300 was designed, there certainly weren't any "standards" to be followed. I have heard of a couple of boards/drivers that use 16-bit I/O and depend on the first byte being stomped-on by the second byte. The first byte contains relatively useless data, which which get immediately overwritten by the second. Not a smart programming move. The bus supports full 16-bit I/O, with the second 16-bit connector (which is NOT an AT format connector, for the same reason listed above). Since you are having to use existing software and hardware, then you are stuck, I would think. Gary