Can I repeat my plea for this? (And also a -YC?) OK, I'm mostly done with the disassembly; available here: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/M873-YA.mac I haven't fully understood the TA11 code (and don't plan to), nor the DECtape/magtape code (might get to that some day), but the disk and paper tape code is completely done. (I'm currently loading over serial lines, for getting the machines running, etc.) The paper tape code is 'interesting'; it took me a while to figure out _exactly_ how it worked. It appears (to me, at least) that that code will not function correctly unless the abs-loader has at least one byte of '0' pad on the end of it, for two reasons. (See the comments on the listing.) Luckily, my copy of the abs loader binary has such; although real .LDA tapes have blank leader, of course, the .LDA files I'm generating don't. The serial line code in the M9301 (-YA at least, and probably the others too) uses the identical code, so it has the identical issue. Noel