Hi All, That's a BA23 in tower stand, aka a room heater. The system looks like a Micro-PDP11/23 or /53. The tape unit seems to be an old model TK50 (it has no markings, which was standard for the old units), the disk could be an RD-53, it has the same alu frame. Other disks (RD54) are full-metal, or smaller (RD31, 32, 20). The buttons on the front panel seem to be just 4, not 6. The original Micro-11 (aka 11/23) had 4, because it could handle only a single disk (the 10MB disk RD50); the newer systems had two extra buttons (online and WP) for a second disk. So... looks like a Micro-11[/23] with larger than standard disk (RD53)and the original TK50 tape. On the back panel we only see the bulkhead for the system-standard DZV-11 4-port async module, of which ports 0 and 1 (console and aux, resp) are in semi-fixed mode. Cheers, Fred PS: for people in NL; I have a few 11/53 systems left... :)