Bought an NTSC 800 with a production date code of 949 this past week and received it on Thursday.  Surprisingly, at least to me, it works very well.  It has a CTIA chip and a 6502B CPU.  I haven't checked to see if it has OS A or OS B yet, but I will once I have it re-assembled.  It has 48K of RAM, with a 16K board and a 32K Axlon RAMCRAM board.  I wonder if this one originally came with an 8K or a 16K board?   Right now it's completely disassembled.  So far I've only seen minor differ