RCA CDP18S711 Instruction Manual
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Appendix A - Test and Operating DataCassette Data TestLoad the following machine language program into memory:0000 90 B6 B3 F8 33 A6 F8 OA0008 A3 D3 F8 6F AC F8 40 B90010 93 F6 DC 29 99 3A 10 F80018 10 A7 F8 08 A9 06 B7 F80020 80 FE DC 97 F6 B7 DC 290028 89 3A 23 17 87 F6 DC 300030 17 30 31 35 00 00 00 00Rewind a blank cassette and put recorder into recordmode. Wait 10 seconds and flip RUN up to initiate theprogram. The byte at location 0033 will be continuouslyrecorded on tape. Flip RUN down to stop recording aftera minute or so. You can play this tape to check thesignals shown below. You can also load the tape intomemory for testing purposes. Load 7 pages starting at0100. You can use this tape to determine the propervolume control setting for your recorder. You can changethe recorded byte at 0033 if desired. Bits on tape consistof one cycle at 2 kHz for31"0" or one cycle at 0.8 kHz for "1". Data format is 4seconds of continuous "0's" for sync followed by thespecified number of data bytes. Bytes always begin witha "1" start bit (S) followed by 8 data bits (0-7), and endwith a parity bit (P). Odd byte parity is used in this code.The waveforms below show how a 35 byte would appearon tape. The operating system translates memory bytes tobit serial output via the Q output line. Bit serial inputfrom tape is received via input flag 2 and translated intoparallel form for storage in memory by the operatingsystem software.A-OUTPUT OF U14AB-OUTPUT FROM CASSETTE (TAP IN PAD ON CARD)C-OUTPUT OF U14B* WAVEFORMS SHOWN FOR PANASONIC MODEL RO-413S RECORDER. |
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