If I'm not mistaken, MODAT was available on the MT500, MX300 Series, Syntor, and MICOR mobiles, as well as the ASTRO series.
Of course its most prominent user was the LAPD.
The MT500 also had MDC as an option.
I was thinking that the HT220 was the first MDC capable radio, as an option later in the product timeline, but I'm not positive of it.