Hi Mike,

but can we have bit masks for ram

Excellent comment I'll look into it, one of the things I have left to do is allow configurable parameters for the ram/io tests. While the hardware does pass back the the failing bits/location currently it would be up to the operator to decide which ram it was if we were talking pairs of 2114's or the like. Within a script you could report back the failure of a particular IC fairly easily but as you point out not so in the standalone mode.

should the memory map / IO etc not be a tree from the CPU

Excellent point no 2. I did notice this failing when I created the project for the screenshots and was in 2 minds about how to resolve it, my own fault for using boards with single cpus while developing and getting tunnel vision. Option 1 was to totally cop out and leave it as-is for the operator to maybe create multiple project files 1 for the main board and others for sub boards, not really an ideal situation. Option 2 do something else but wasn't sure what. Now you've given me a solution :o) As for USB chips I don't have stock of them as yet I bought an off the shelf module from the manufacturers distributor to minimise the development phase of the comms side of things. It has all the components and connector on a 32pin dip module but at £25 a pop I won't be using them on the finished design. Thanks for the very useful feedback Chris If you ever want to (un)subscribe yourself with TTL, you can send mail to: <Majordomo@flippers.com> with the following command in the body of your email message: (un)subscribe techtoolslist or from another email account, besides xxx@yyy.com: (un)subscribe techtoolslist xxx@yyy.com