[GreenKeys] newbe asking about HAL ST800a's on ebay

[weather]

There have been several used ST800a's and several new ones as well on ebay.
Will these units fire the old teletypes 15's. 19's & 28's?  Do these units supply loop current so that it can be adjusted to 60ma?  Will these units also run multiple machines, as in have several machines copying the same signal at the same time? (I am aware there is not much out there to copy, but I still wanted to have something fairly dependable to use when I want to.  I understand there is still some weather to copy from Canada, US Coast Guardn and German Weather, some strong signals even 24/7 @ 75 baud?)
Here is ebay link to the new one: http://cgi.ebay.com/HAL-COMMUNICATIONS-ST-8000A-RTTY-HAM-RADIO-HF-MODEM-NEW_W0QQitemZ130278669243QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item130278669243&_trksid=p3286.c0.m14&_trkparms=72%3A1234%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50 

ebay item # 130278669243