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collapseos/blk/461

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( See comment in B321. TODO: test on real hardware. in qemu,
the resulting delay is more than 10x too long. )
CODE TICKS 1 chkPS, ( n=100us )
SI DX MOVxx, ( protect IP )
AX POPx, BX 100 MOVxI, BX MULx,
CX DX MOVxx, ( high ) DX AX MOVxx, ( low )
AX 0x8600 MOVxI, ( 86h, WAIT ) 0x15 INT,
DX SI MOVxx, ( restore IP )
;CODE