INT 21 P - FlashTek X-32VM - SET SELECTOR BASE ADDRESS
AX = 3503h
BX = selector
ECX = base address
Return: CF clear if successful
CF set on error (invalid selector)
Note:   there are probably additional 35xxh functions, but the message
containing the FlashTek calls was truncated in transit and the
remaining information did not arrive prior to release

See also: 310007

213503 - FlashTek X-32VM - SET SELECTOR BASE ADDRESS