an interesting round-up

Ok, here's some of what I arrested into the custody of my collection yesterday. A zero-emission Mac 512K. This is truly bizarre. Its a normal looking Mac 512K until you look closer and notice there is a second built-in floppy on the right-hand side, oriented vertically. The brightness knob is missing from the front and replaced with a little square that is the same color and texture as the rest of the case. It was moved to the back. The power cord is not detachable like on a normal Mac but is instead permanently attached. The external disk drive connector is gone, and so is the slot where you can insert a security cable; its covered over. Opening this thing is half-past a bitch and a quarter till a pain in the ass. I finally get it open by removing all the screws on the DB-9 connectors on the back and find a totally shielded interior. The disk drives and motherboard are encased in aluminum. The monitor has a gold foil pasted to its entire exterior. The video cable is shielded inside a heavy duty stranded shielding, as well as the cable going to the second disk drive. Even the DB-9 connectors have extra shielding around them. It was made by a company called Systematics General in Sterling, Virginia. Anyone know anything about these? I also collected several DEC boards I am assuming go to a PDP-11. Someone help me identify these: DEC M8045 - 32K 18 BIT MOS MEM (guess that one is pretty obvious) (note: I have two of these. On the board they have M8045 but on the front tab one says M8044 DF and the other M8044DB) M7949 M7957 - ASYN MUX M7551-CA - Definitely looks like a memory board M7136 - LPWR GS-2 (?) This one has a busted chip but upon close examination it looks like the IC is still intact with the spider-web fine wires still attached to the wafer. Half the silicon is missing but I can still see its an AMD chip. Looking at the front of the card with the edge connectors down, its on the bottom row of chips, third chip from the left. Looks like it starts with AMPALI5R?? Next row of numbers is 84H90 maybe? M8013 - RLV11 DISK CONTROL Can't find the part number on this next one but its clearly labelled RDRX DISK CONTROLLER. M7135 - ??? This one has five 24 pin chips with lots of gold with a big square chip next to them. A scrappers dream with all the gold on this sucker. USDC (this is what is stamped on the board). All I can see of this board is 10-1108-02, with the 02 being scrawled into a solder pad. Has an AMD 8418 and what looks to be a Fairchild MBL8086-2 (CPU?) on it. I only say Farichild because it has an F with a line above and below it. Also has a couple 64K EPROMS. Finally, it has a 50 pin connector on the top (don't know what its type is called but it looks like ::::::::::::::::::). These boards were sitting in a scrap bin and some are pretty scuffed up. I don't even know if they work. Some need some solder repair work. All are pretty much in tact. The only major damage is that one broken PAL. Sam Alternate e-mail: dastar(a)siconic.com ------------------------------------------------------------------------------- Computer Historian, Programmer, Musician, Philosopher, Athlete, Writer, Jackass Attend the First Annual Vintage Computer Festival See http://www.siconic.com/vcf for details!