Gentlemen, I finally got my board into my Northstar Horizon for testing tonight.
I can confirm that I am seeing the same thing as described previously. RUN/STOP appears to operate correctly. RESET appears to operate correctly. Single Step appears to operate correctly. I think EXAMINE might be working (I can set an address, and EXAMINE and always get the same value). I'm not so sure about EXAMINE NEXT - each press seems to cycle through 4 different addresses (non-sequential) then go back to the starting address. DEPOSIT is definitely not working. I am unable to DEPOSIT a value into RAM. My setup - Stock Northstar Horizon. The Northstar CPU board has a front panel connector which I have connected to the FP mini. Jumpers - all combinations have been attempted, and I'm unsure what the correct settings should be. I can perform any debugging or testing if anyone can suggest what I should be looking for. Otherwise, I will wait for others to see what they find out. Ian > On Mar 2, 2015, at 7:40 AM, Don Caprio <[email protected]> wrote: > > Rich, > > I'm having the same Examine problem with my board as well. > Josh had the last prototype working and all his mods went to the > schematic. > > I need to go back and review our emails and make sure all the > changes got made. > > > > On 03/ 1/15 03:05 PM, Richard Cini wrote: >> A quick follow-up. I did some probing of the LS123 one-shots and I >> discovered something interesting. Pin 12 (Q-prime) on both U17 and U20 are >> free-running. The other one shots seem to be triggering properly. I don’t >> see any immediate cause for this, so I swapped the chips but I get the same >> result. >> >> Rich >> >> -- >> Rich Cini >> Collector of Classic Computers >> Build Master and lead engineer, Altair32 Emulator >> http://www.classiccmp.org/cini <http://www.classiccmp.org/cini> >> http://www.classiccmp.org/altair32 <http://www.classiccmp.org/altair32> >> >> From: Richard A Cini <[email protected] <mailto:[email protected]>> >> Date: Sunday, March 1, 2015 at 4:29 PM >> To: S100-Post <[email protected] >> <mailto:[email protected]>> >> Subject: MiniFP build - data bus question >> >> Guys — >> >> I finished my MiniFP board this morning and I can’t seem to deposit to or >> read from memory using the EXAMINE toggle. The “next” part of the function >> works, so I can step among addresses but the data LEDs are all on all the >> time (unless I set JP5 SSW_DSBL jumper). However, if I use the SINGLE_STEP >> switch, the data bus LEDs appear to reflect memory contents. >> >> The experimental system is very simple CompuPro RAM17 (64k), IMSAI 8080 >> board, and the front panel. Before I say that anything is wrong, can someone >> confirm the jumpers? I think only the MWRT should be jumpered. The RAM17 is >> an IEEE-696 board so as I do for my IMSAI, I’ve isolated >> pins 20/70 (UNPROT/PROT) on that board. >> >> Chip-wise, I’ve used LS (including the LS123 as recommended in the Wiki) >> except the 7402. I don’t have any 7400’s in-stock so I’m using LS00 for >> now…don’t know if that’s part of the issue since those gates are used in the >> EXAMINE circuit. I replaced the 8212 just in case, but that had no effect. >> The data cable is fine. >> >> Any help, even questions to get me thinking, would be appreciated. I feel >> I’m pretty close to a solution here. >> >> Thanks! >> >> Rich >> >> -- >> Rich Cini >> Collector of Classic Computers >> Build Master and lead engineer, Altair32 Emulator >> http://www.classiccmp.org/cini <http://www.classiccmp.org/cini> >> http://www.classiccmp.org/altair32 <http://www.classiccmp.org/altair32>-- >> 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] >> <mailto:[email protected]>. >> For more options, visit https://groups.google.com/d/optout >> <https://groups.google.com/d/optout>. > > -- > Don Caprio > [email protected] <mailto:[email protected]>--- > > Filter service subscribers can train this email as spam or not-spam here > <http://my.email-as.net/spamham/cgi-bin/learn.pl?messageid=DA027E52C0F111E49ABEF44393ED0201> > > -- > 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] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout > <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.
