R1801 help, MX-S, MCX, Syntor

[DavidJ]

Great to see the discussion board back up, hope the SINAD stays high.

I'm trying to get up to speed supporting a bunch of MX-S and MCX-100 radios for a local emergency response group. I finally got an R1801 programmer with the firmware and adapter for the C & D rev EEPROMs. But, these are still $52.75 from Mot and we'd like to be able to put more of these radios in the field without paying all that. Does anyone have the schematic for the adapter used with A & B series OTP PROMs? It would seem not too difficult to make an adapter that was convertible from one to the other with jumpers. The applications PROM seems to be the same part number. Likewise, looking for data on the various 16 pin PROM adapters as used in MCX and Syntor -- I have the one used for Syntor PL (and cell phone NAMs). Also of course looking for MCX and Syntor applications PROMS -- these too are NLA from Mot.

Finally, has anyone identified the EEPROM used in the current (D rev) MX-S module? The older ones were ceramic flat-pack and had no type numbers, current ones are chip-on-board. There is a new series of parallel EEPROM from Atmel that would work fine, except that the packages are too big. I think that might be solvable however by making a circuit board a little wider -- there is only 0.45" between the oscillator element housings and the bottom of the case though.

Brick radios forever...

[evanh]

Although I have not tried these myself, the same PROM used for the Syntor is also used in the MCX100.

There is some information for replacing the 82S129 or 82S131 PROM with<br>a 2716 or 27C16 EEPROM at this link.<br><a href="http://www.open.org/~blenderm/syntorx/l ... om.html</a>