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0000 90 B1 B2 B3 F8 17 A3 D3
0008 42 70 22 78 22 52 C4 C4
0010 C4 94 80 91 AO 30 08 F8
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0020 04 B4 F8 00 A4 94 B7 84
0028 A7 7A E2 F8 00 A5 F8 FF
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0038 52 87 F3 3A 45 9A 52 97
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0050 07 52 85 F3 3A 6C F8 FF
0058 A5 93 A6 31 60 7B 30 31
0060 17 97 52 94 FC 04 F3 3A
0068 29 7A 30 6A 7B 30 6D 00
0070 00 00 00 00 00 00 00 00
0078 00 00 00 00 00 00 00 00
32 RCA COSMAC VIP Instruction Manual
Cassette Recording Guidelines
1. Use high quality tape (Maxell UD or 19.
equivalent).
2. Use shortest tapes possible. You can shorten
tapes to several minutes in length if you enjoy 20.
splicing.
3. Keep heads and pinch rollers clean.
4. Keep heads aligned for tape interchangeability.
5. Avoid recording too close to beginning of tape.
6. Make sure cassette is properly seated in 22.
recorder.
7
If you have trouble with a cassette try others.
You can have a had spot on tape or a warped
cassette.
8. Highest setting of tone control is usually best.
9. Set recorder volume control so that TAPE light
glows steadily on playback. This setting should
be lower than highest-volume setting. Excessive
TAPE light flickering indicates a bad tape or
misaligned heads.
10. A dirty recorder volume control can cause tape
dropouts.
11.
Make sure cassette connection plugs make good
contact.
12. Rewind cassettes before removing them from
recorder.
14. Avoid exposing cassettes to heat or magnetic
fields.
13. Store cassettes in dust-proof containers.
15. Before recording, wind cassette to one end and
fully rewind.
16. Cassette recorders will give you problems once in
a while (they don't like certain cassettes, etc.). If
one gives you problems most of the time replace
it.
17. Make sure that MIKE plug is connected before
recording. You will hear a tone even if MIKE plug
is out. On most recorders the TAPE light will
glow while recording.
18. When recording give the page key a short tap to
start.
Use the last byte of a tape block as a program
identification and check code. It will appear on the
display screen after the tape is loaded.
When loading a cassette into memory, the tape
must contain as many pages as you specify to be
loaded. If you try to load 8 pages from a 7-page
tape the loading operation won't terminate
properly.
21. You may have to record with the EAR plug out
for some tape recorders.
Always use AC adaptor with recorder for best
results.
Memory Test Program
This machine language program should be loaded into
0000-007F. It checks RAM locations 0000-07FF (UI8
and U19) for proper data storage. Flip RUN up to start
test. Beeps sound during test. Entire 1024 byte section
of RAM being tested is shown on screen. Program stops
with tone on if a bad RAM bit is found. Error byte is at
007F. This byte should be 00 or FF for no error. For
example, if byte is 01 or FE then bit 0 was bad. The
error byte is also shown on the screen.
Set location 0020=00 and location 0023=80 to test
RAM locations 0080-03FF (U16 and U17).