Toshiba Satellite 110 Series Maintenance Manual page 71

Subtest 03 Point to Point (Send)
NOTE: To execute this subtest, two machines must be connected with an
RS-232-C direct cable. One machine should be set as "send"
(Subtest 03) and the other set as "receive" (Subtest 04). The wiring
diagram for the RS-232-C direct cable is described in Appendix F.
Sends 20h through 7Eh data to the receive side, then receives the sent data and
compares it to the original data.
Subtest 04 Point to Point (Receive)
Used with Subtest 03 described above. Receives the data from the send side,
then sends the received data.
Subtest 05 Interrupt Test
Checks the Interrupt Request Level of IRQ 4, 3, and 5 from the send side.
110 Series
3-25