S: AS/400 connection software for classic Apple Macintosh

Hello, I'm searching for certain software to make AS/400 and Classic Macs (late System 6 to 7.6.1) "talk" together properly. It's no problem to get this with current OS X but the old software has gone and I can't find this, let's call it abandonware, on the net. I'm running an 9401/170 attached to a token ring where also a Mac IIfx with a TokenRing NB 4/16-Board is attached. Plus a PowerMac 7500, also with a Token Ring Board. The whole stuff is running very smooothly but I'm lacking direct access to SNA and/or tn5250 via TCP/IP. According to an old Apple Book (Data communications and networks) there have been many solutions available (in no particular order): - Incarnations of sna?ps 5250 (gateway and client), - MacRUMBA Gateway (I got hold on the client a few months ago), - TokenAxcess, - MacMainframe (gateway and workstation), - asc5250 (Comm Toolbox module collection for TCP/IP), - MacMidrange, - Possibly MacIRMA (gateway and workstation), - MacTwin (with Twinax Card! Without it's nearly useless). - Netware for SAA 3.x, since I'm running NW 3.12 in a virtual machine. Any of these are of interest. A big plus (but not a must-have) would be if the particular software is complete with original disks, manual(s), and package. I also heard of a PTF for the AS/400 which provides AppleTalk service to the machine. Users can then connect to the AS/400 via Mac RUMBA, sna.ps client or such. One source of information said, this was a looong time ago and that PTF is expected to apply to OS/400 V3 or older, while I'm running V4R5. More specific information on this topic would be very welcome! Can't find anything useful on the net for that. Thank you in advance for your time and help. Regards, PoC