Todd, Looks like you've found a bug in my RAM test routine. When it errors, it should report the location of the error, since it's only testing F000-FFFF, then it shouldn't report 042A. But since it is giving an error, and this doesn't happen on my board (I better recheck it tonight after work), then I would think there's something wrong with the RAM circuit. Perhaps their could be a problem with some types of RAM? Maybe even the CPU chip might be causing the trouble?
Well, time to run to work.... Cheers, Josh Date: Tue, 17 Feb 2015 19:48:45 -0800 From: [email protected] To: [email protected] Subject: [N8VEM-S100:6340] Re: IMSAI 8080A CPU board help. Thanks, My Prop was similar except this was how I had it strapped for my setup; P77 P76 x-x x-x x-x x-x I changed it to your setup and now it displays key-press except, it only responds to 'R' key-press. > . . r Testing SYSTEM RAM @F000-FFFF RAM PAGE MARCH. FAILED AT:042A - SYSTEM HALTED When does it try to boot to the SD card ? If you have time, how is your CPU board strapped ? On Monday, February 16, 2015 at 1:45:14 PM UTC-6, Todd Miller wrote:Booting up Crusty's 8080 CPU board with ver 1 of the Prop I/O card. The Boot loader flys off the screen like a key is being held down. I can see the message; Altair/Imsai <banner> <D> Directory <R> Ram Test <V> View Load > First few boots I missed it, too busy looking at the SMB, but then caught it out the corner of my eye. Rebooted and stopped the CPU after I saw the menu. I'm guessing I don't have the Prop I/O set up for the correct "status bits" for KEYBOARD in/out. I recall dealing with this to match it up to my ver Dos. What should it be set to ? JP8/JP9 all jumpered JP10 no jumpers, don't understand... -- 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.
