RCA CDP18S711, Instruction Manual

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Cassette Attachment Diagram
RCA COSMAC VIP Instruction Manual
Cassette Phase Test
For best results your cassette recorder should not
reverse the phase of an input signal on playback. When
playing back a tape recorded on another recorder, it
should not reverse the phase of the output signal. You
may have to reverse the internal head connections on
some cassette recorders to eliminate unwanted phase
reversals.
To check for phase reversals, load the machine
language test program, given below, into memory.
Run this program to generate a phase test signal on the
tape out line. Record one minute of this test signal, then
play it back and observe the cassette recorder output on a
scope. It should appear as shown in B or C below. Save
this tape to test new recorders on which you want to play
tapes you have recorded on a previously tested machine.
If the playback signal appears upside down from that
shown in B or C, you will have to reverse the internal
head connection leads on the out-of-phase recorder.
Test Program
0000 F8 04 AA 7B F8 0C FF 01
0008 3A 06 7A F8 0C FF 01 3A
0010 0D 2A 8A 3A 03 F8 60 FF
0018 01 3A 17 30 00 00 00 00
Signals