Quoted from pedroborges:
but if cpu board tested the outputs of the uln2803 in ttl, the power drive board should not be equal to the test ?
Either one will work. Sometimes it's a gray area when you get a CMOS chip that is TTL compatible. My earlier thread on the ULN2803 on the cpu should probably say CMOS rather than TTL, but again either one will work in this case.