Recent content by Boctor

I was poking at 7.1.1 Pro out of curiosity, since one of my disk images had it for some reason. (I'm already sold on 7.1 with the System Update and everything, very aware of Pro's reputation and status.) However, I noticed that the startup time is abysmal, even on zero-wait Mac II-family...

Personally, I had to do my zero-track position with trial and error, and repeatedly plug the drive into a IIsi for testing. I did not have any kind of special equipment, so it was extremely tedious. The Larry Pina "Macintosh Upgrade & Secrets SE" book claims that being unable to fully initialize...

Is the zero-track position on drive 1 properly aligned? Not exactly a trivial question, but I only ask because it was the issue for 3 in every 4 auto-injecting drives I've cleaned, and seems to be a common problem.

The discharge with the alligator clip and flathead is pretty safe and straightforward, if you don't trust the bleed resistor. You don't have to put your actual hand anywhere near the conductor, just the screwdriver and alligator clip sending current straight into the ground lug, assuming it's...

This thread's turning into more of a build log, with the only fault removed. Finished putting the rest of the components on and cleaning residue. Not going to install the buttons despite having them, since they're salvaged and have some kind of dried up glue on them, and I don't have the right...

I thought this was what was happening to me, but it was a red herring. I actually had a data line short to Vcc, which was holding up the whole bus since that bit was stuck high. Even on working machines, I am not able to see ROMN going low on my scope. Are you using one of the auto settings to...

This is all a bit surreal. I still need to pop a SCSI header and an ADB port in here to check it out a bit further, but I am very pleased at how much sense this made, in the middle of a seemingly impossible puzzle. I did reason pretty quickly that the bus walk and lack of data transfer meant...

I'd agree with this, unless you have a personal preference or special use case for the PLCC sockets, or another machine/SIMM adapter to test them in and rule them out. I'd also tried building mine with the sockets, but realized that since there's a proper coin cell clip for a less volatile...

At the time of writing, the "Simasima" PDF guide I was using to troubleshoot lists incorrect address bus frequencies. I also did not realize that the processor eventually stopped walking the bus (I think) after enough time has passed, hence why I was not seeing anything on the address lines when...

I'm currently having this same issue with ROMN staying high, and trying to figure out what criteria determine the level of that pin (if GLUE does some kind of logic or just forwards it from somewhere else) or where to walk back on the schematic to check my work. I am not using PLCC sockets or...

(Given the false-positive from not having a proper scope, I wish I could re-title this thread to something more appropriate, so as not to bother people searching for that issue. I know at least one other person was having issues getting the 16 and 32Mhz clocks from GLUE, so it is a real...

Thanks for reminding me about those jumper pads. I saw them on the first day of assembly, then quickly forgot about their purpose. I still do not hear the speaker pop when turning on, nor any kind of chime. My ROMs are the PLCCs with the properly byte-reversed bins from your repo, the V-labeled...