Got the board running at 10mhz, using a mix of 74F and 74ALS parts! I use it with the 4MEG ram board with no wait states (the ram board has some components replaced with 74F as indicated on s100computers). My backplane has a terminator board. On Apr 29, 2014 11:43 PM, "Fabio Battaglia" <[email protected]> wrote:
> Hi everyone! > Today I wanted to take a break from coding and decided to take the > soldering iron in hand to relax a bit. The objective: get my N8VEM Z80 cpu > card up and running. > I had already soldered most of the passive components a week ago: all that > was left to do (or so I thought) was to solder a few headers, plug the > components and start with a simple print loop monitor to test the card. > > Everything went well until the end, when I noticed one of the 74LS165 had > a disconnected pin: turned out the machined socket was bad and one pin was > not making contact. I had to desolder the socket, and sadly I damaged not > one, but two vias in the process (first ones since years... I guess hurry > of completing the board fired back)! The damage wasn't serious enough to > interrupt the traces, but to play safe I rewired the connections on the > back. > Anyway, now the board correctly starts the monitor, can switch back and > forth between low and high pages and can read/write the full 1Mb from the > EPROM/RAM card i have installed. > > I'll leave work on the board on hold until I get the 6502 V2, because > right now I'm having fun with IDE code for that processor and my 6502 v1 > cannot live on the bus with another processor card (btw, now I can read and > write any sector on my CF cards! I'll publish the code this weekend). > > Attaching a few pictures of the card working and of the repair on the back. > > Bye! > Fabio > > -- > You received this message because you are subscribed to the Google Groups > "N8VEM-S100" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
