Software for DSP-599zx RTTY Modem

October 1, 1996

Several users have enquired as to what software packages can be used to operate our RTTY Modem in the DSP-599zx. I have tested the following three packages and they work to a greater or lesser degree. The comments that accompany them are from my experiences with them.

1) CompRTTY II

This software, by David Rice KC2HO worked the best for me. It is a Dos program that behaves well under Windows 3.x or Windows 95. I was able to run it with a standard RS-232 cable.

2) BMK-Multy

This software worked OK on both transmit and receive, but requires the user to modify the standard RS-232 cable.

3) HamComm

This software worked OK on receive, but also requires the user to modify the standard RS-232 cable. It did not work on transmit and required some additional circuitry, which is documented in the HamComm user manual

Our preference is CompRTTY II. I was able to get it up and running in minutes flat using a standard RS-232 cable. It multitasks well under Windows 95 though I had to set it up as a full screen application. It also allows the user to monitor a second TNC which they might want to have connected to a DX Cluster node or other VHF Packet function. It has logging and a basic contest mode also. You can contact the author via e-mail (

Oh yes, there is a program for the Commodore 64 called MBA-TOR which also works with our box. If you know of any other software that supports RS-232 demodulated RTTY, let me know and I'll add it to the list.

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