I am actually now build my second board (I have two main S-100 systems. One is a 10 slot “test rig” the other is my main 21 slot system). I will see if the second one behaves the same. You will note on the last prototype, I had some serious real wire connections on some of the data lines. These look real ugly but actually provide a better signal at high speeds. Just an idea. It’s not the CPU chip. I switched that.
Will update if I get anything. Remember the 80286 is much faster internally to the 8086. So even though we are running that board at 24 MHz (bus actually 12MHz) the 80286 loads MS-DOS runs faster. Just do a DIR command with both CPU’s and see.
Let me know what you get.
John Monahan Ph.D
From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of David Fry
Excellent news :-)
I was kinda holding off on starting my 80286 board in case the mods/fix ended up being extensive (I have the S-100 Ram/Rom board on order also)
Just wondering if will you be investigating why the final board will only manage 11Mhz when the prototype manages 12Mhz ?
It's not a big issue but would be nice to get to 12Mhz if possible.
regards and thanks