link: http://www.ebay.com/itm/272363812201 Here's the MITS serial interface everyone wants, and this one is fully tested and working! I had to replace a 1488 and 1489. I installed wire wrap pins in the baud rate selection area so that a) pads won't get lifted when you need to change baud rates and b) you can jumper both ports to the same baud rate. Includes two nice ceramic Motorola 6850 ACIAs, original to the board. Currently jumpered for standard MITS port addressing (0x10 or 020 octal), RS-232 serial, and 9600 bps on both ports. Includes the original cable for Port 0. I've got the cable that came with it for Port 1, but it's in poor condition and not currently working. I can include it for free, if you want it. Thanks, Jonathan