Toshiba T2100 Series Maintenance Manual page 76

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 illustrated in Appendix G.
This subtest 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)
This subtest is used with subtest 03 described above. The subtest receives the
data from the send side, then sends the received data.
Subtest 05 Interrupt Test
This subtest checks the Interrupt Request Level of IRQ 4, 3 and 5 from the
send side.
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T2100 Series