jtk@kolvir.arlington.ma.us said:
> Adding the extra read to flush doesn't help.  Using a brand-new
> keyboard with it doesn't help either :(.  Same symptom. 

So perhaps the keyboard controller answers the test
command with either an ACK and a 0, or with the ACK only.
Can you perhaps test the patch to find out?
(perhaps the same will be necessary for the mouse channel.)

best regards
Matthias

Index: pckbc.c
===================================================================
RCS file: /cvsroot/src/sys/dev/isa/pckbc.c,v
retrieving revision 1.9
diff -c -2 -r1.9 pckbc.c
*** pckbc.c	1998/11/16 22:35:18	1.9
--- pckbc.c	1998/12/11 12:28:54
***************
*** 432,437 ****
  			cmdbits |= KC8_KENABLE;
  	} else {
! 		printf("kbc: kbd port test: %x\n", res);
! 		return;
  	}
  
--- 432,446 ----
  			cmdbits |= KC8_KENABLE;
  	} else {
! 		if (res == 0xfa) {
! 			res = pckbc_poll_data1(iot, ioh_d, ioh_c,
! 					       PCKBC_KBD_SLOT, 0);
! 			printf("kbcporttest: fa/%x\n", res);
! 			/* attach anyway */
! 			if (pckbc_attach_slot(sc, PCKBC_KBD_SLOT))
! 				cmdbits |= KC8_KENABLE;
! 		} else {
! 			printf("kbc: kbd port test: %x\n", res);
! 			return;
! 		}
  	}