Qbus HDLC controller -- a "what is it" board

Here's something else from my junk box that somebody might know what to do with: Four half-width Qbus boards, built by Applied Computer Consultants, Santa Barbara, CA. It looks like a DEC compatible DMA board and a three-board Z80-based standalone HDLC controller that sucks power off the Qbus. 1: this one attaches to the Qbus, and is called MDMA. Contains four AM2901 bit slices, a row of microcode ROMs, some logic, and a ribbon cable connector on the front edge. I'd venture a guess that this might be a clone of some DMA board Digital made. 2: this, and the remaining boards, get only power from the backplane. This board has two Zilog DMA's and a bunch of 74LS buffers, latches, and logic, all in sockets. Name: XQCP-I, serial number 235. It has a ribbon cable to the next board. My guess is this is a DMA board that lets the standalone uC talk to the PDP-11's DMA board. 3: a memory board. Contains 8 ROM sockets, 4 of them populated. ROM labels are marked IF-11Q/HDLC. Also 16 TMS4116-20L DRAMs. Name: XQCP-M, serial number 230. There is yet another ribbon cable connecting it to the next board. 4: CPU board. Zilog Z80-A, two more DMAs, an SIO/2, a CTC, and a little logic, all in sockets. Name: XQCP-P, serial number 240. There are two narrow ribbon cables on the front edge. There is no documentation, and I'll never have time to fool with it. If you want it, send me an email, and we'll draw straws in a couple days to see who gets it. -- Jonathan Engdahl???????????????? Rockwell Automation Principal Research Engineer????? 24800 Tungsten Road Advanced Technology????????????? Euclid, OH 44117, USA Euclid Labs????????????????????? engdahl(a)cle.ab.com 216-266-6409