Old Chip Info?

I've recently acquired an old Wang 144T programmable electronic calculator. Early '70's technology. Uses a lot of 7400-series TTL, along with some older DTL. It is a microcoded machine, using a Texas Instruments TMS 2600 2K-bit Mask Programmed ROM for the microcode store. I want to try to capture the content of the ROM, but I've not been able to find a pinout and specifications for it anywhere. Anyone out there have any old TI databooks that they might find this old device in? The date codes on all of the parts in the machine range from 7132 to 7144, so it's all mid-to-late '71 timeframe for manufacture, if that helps. According to one reference I found, the chip was introduced in 1970. Thanks, Rick Bensene The Old Calculator Web Museum http://oldcalculatormuseum.com