I've been banging my head for about 3 days now trying to get a Mark IV to run the TEST1B.BIN successfully. So far I can verify the following:
1. I'm using a Z8S18033 with a 18.432 oscillator and have a good clock on pin 3 and 1/2 on PHI pin 68. 2. The power LED goes green and stays green. 3. I checked all sockets for voltage and ground and all are okay. Nothing it getting hot to indicate a true short 4. Reset seems to be working correctly. At least I see it drop on pin 1 of U31. 5. ROM is a SST39SF040 flash programmed with the minipro programmer. P11 and P12 are in the 2-3 position for flash. 6. I'm using SN74LS for all the logic chips. Like many on the list this is my first major digital electronics project. I do have access to a scope and a Salaea 16 port logic probe. Poking around I see various things twiddle, but I'm not sure where to look for the fault. I've thought about trying a slower oscillator, but would need to order one. Any help would be appreciated. -- Anthony DeStefano [email protected] -- You received this message because you are subscribed to the Google Groups "N8VEM" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/n8vem. For more options, visit https://groups.google.com/d/optout.
