The idea is impressive, but that PCB is huge. Any chance the design could be made smaller? Jim Hi Jim The PropIO was designed as an ECB standard board (160x100mm) Eurocard format and is intended for use with the rest of the N8VEM system. However, the subject came up of adding SD to KayPro on the vintage-computer.com forums and rather than designing a board unique to that system my hope is to reuse an existing part with little or no modification. If you were to design a specific Propeller board for the KayPro it could be much smaller but then it would be forever tied to that platform. The concept here is to make an adapter board to allow general purpose N8VEM boards to provide IO to the less common vintage computers that are "stranded" due to lack of current hardware development and/or small developer community. WaveMate Bullet is an example but I am sure there are dozens if not hundreds of others. I am trying to gauge what sort of interest there is in this approach if any. Certainly this is less than optimal solution for any specific machine but then it may be applicable across a whole spectrum of vintage computers (Z80 DIP 40 socket). Most likely this idea will go no where but it is interesting to me and the initial test results are showing promise. This in theory could be a way to add features like DiskIO (IDE/FDC), video (VDU), or microSD (PropIO) to less common systems that otherwise would never get it. Thanks and have a nice day! Andrew Lynch PS, the empty sockets on the PropIO are for the second Propeller. It is currently unallocated but communicates with the SBC over the ECB in a similar fashion as the first Propeller which serves the PS/2 keyboard, VGA, and microSD interface. The second Propeller has several free IO pins which are intended for builder experimentation. There are a few proposed ideas on how to use the second Propeller such as an EN28J60 Ethernet interface with PropNIC and/or the Propeller USB converter. I was planning initially on adding TV, audio, and some other toy doodads but the other builders convinced me to keep the second Propeller unallocated and instead add the mini prototyping area. The PropIO also includes a mezzanine connector and mounting hardware for a full sized mezzanine "upper deck" so builders can add whatever suits them. PropIO is a rather experimental board and not really a final design - more of a proof of concept. Thus it is ideal for situations where non-typical adaptations like jamming into a KayPro are being explored.