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HomeVision and HomeVision-PC Hardware Versions
Up through early 1998, the HomeVision and HomeVision-PC part numbers (located on the
bottom of the enclosure) were as follows:
 | HomeVision : 1203A |
| HomeVision-PC : 1303A |
In early 1998, both circuit boards were modified slightly to Revision C. The new part
numbers are:
| HomeVision : 1203C |
| HomeVision-PC : 1303C |
The main changes with the newer Revision C boards are as follows:
| A 75 Ohm resistor was placed in series with the infrared output jack.
This prevents a short on the output from damaging or shutting down the controller. |
| Variable resistors VR1 and VR2 have been replaced by high-precision fixed
resistors. The resistors are used to set the video signal level. If you have a newer
board, ignore the owner’s manual section that discusses adjusting the variable
resistors. |
| One of the two infrared receivers was replaced with a higher-performance
device. This receiver is only used when learning signals when the "learn carrier
frequency" option is enabled. The new receiver has improved range, meaning you
don’t have to hold your remote as close to HomeVision (or HomeVision-PC). |
| Four mounting holes were added to the circuit board to simplify
installation in a custom enclosure. |
| Revision C boards support a larger PROM memory chip. As a result,
the older Rev A boards cannot support
any PROM newer than version 3.3. Thus, they cannot use the new United States daylight
savings time start and end dates that begin in 2007. In addition, the
3.3 and older PROMs do not support GE (CADDX) NetworX serial (RS-232) security systems or the DS18S20 digital temperature sensors. |
IMPORTANT NOTE:
The newer Revision C boards use a different PROM than the older boards. PROMs for the
new boards are labeled with the letter "C" as a prefix to indicate this. PROMs
without the letter "C" prefix are intended for the older boards. Using
the wrong PROM will result in incorrect controller operation. When you
upgrade to a new software/firmware version, please let us know
which board you have so we can send you the correct PROM.
HomeVision-Pro Hardware Versions
There is only one HomeVision-Pro hardware version.
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