Search results

Ah, thanks. As suspected. While I have a set of ceramic-shaft RF screwdrivers, I finally tossed my all-plastic CRT/TV tool pouch years ago. Now I need the hex tool it had, the one I never used. Time to improvise. Whittling down a cheap bamboo chopstick is Plan A :)

Hi all, dusting off an SE I recapped oh, three years ago. The video needed readjustment, and after correcting the height I noticed that the vertical height coil seems to have no screw tap in there. I can't tell for sure - does it accept a (plastic) Allen wrench instead? Or is the plastic...

I dusted these two boxes off this week. The better one booted again, and after adding the RasterOps 8L and an Ethernet card was stable for a few days until it began to just "stop" erratically. Lost video (black monitor screen) and disk activity would cease, but the PSU fan and disk drive keep...

Positive things to share: Expanding the memory of the RasterOps 8L does not increase the pixel depth. As suspected, that requires replacing the onboard ROM too. But the RAM alone does enable larger virtual screens, panning, and zooming features. It was cool to have a Nubus video card that could...

To debug the SIMM Bank B issue, I placed a SIMM into the four slots in turn, power cycling between attempts, hoping to see a clue that might narrow the traces to check. But this experiment returned the IIcx to sad chimes. I think I may give up on this hobby.

Summary Macintosh IIcx #2 booted System 7.5 from internal HDD and from floppy today. It displayed the UI in 256 colors over the RasterOps NuBus card and used MacWeb, Network Time, and MacTCP Ping to access the Internet via a NuBus 10Base-T Ethernet card. 16MB DRAM in Bank A. ADB power-on and...

The first IIcx has been checked out by AppleCAT. AppleCAT is finding an issue with SIMM Bank A, and the door remains open for SIMM Bank B - the tests end after the Bank A issue. I have swapped the 4x4MB SIMMs in bank A out for 4x256KB SIMMs that I had on hand, but AppleCAT still fails Bank A...

I got back to the IIcx's last week. Good news, I think, is that after they sad-chime, their modem ports do echo serial data back (9600 8N1). So either the serial controllers power-up in a loopback mode, or the ROM diagnostic is a real thing and is running. Bad news, not too bad really, is that...

I was trying to get MR Browser working on a 16MHz LC II with 10Mbps Ethernet last night. Versions V0.19 and V0.32 both time out during sign in. Thinking that I might be contending with MR's nightly backup, I tried again this morning, no go. My ping times are good and DNS is working fine, so.. I...

Summary: improved a few solder joints; still sad chimes; four flat tires verifying SIMMs; schematic errata found. I reviewed this IIcx's RAM address bus. I found a few newly soldered pins that were 1-3 ohms, a result of my getting tired late last night and not using enough paste - and my paste...

I wet them, but reading around, it seems I should pause for a bit before proceeding. I'll start wetting everything I plan to work, then going back and heating up things in the same order, to give the flux more time to act. Thanks for the tip!

Q: what's a good air temperature for desoldering corroded leads? On the topic of desoldering.. it seems to me that corroded solder is much harder to liquify than fresh. I just spent my first day using a narrow-nozzle, rework-intent hot air gun. I damaged absolutely no pads, which was...

Summary: great relevant thread; logic board not fried, PSU working; sad chimes; discussion of what the sad chime rule out. Thanks for the swift reply, dougg3 ! The topic you mention is informative, and it also gave me some insight on the VGA adapter I use (the one mentioned in the thread). And...

Summary: what resistance should be present between +5V and ground on a logic board with no ADBs, cards, RAM, or drives attached? I worked on a IIcx with a recapped power supply that would not lock "on" after pressing either power button (keyboard or rear panel). The power supply relay starts...

I have looked around for old bottom-cavity PGA ZIF sockets, thinking I could use my heavily reworked but operational LC475 as a test bed for salvaged 040 chips. They do a fine job of gently massaging warped pins back into line. Take the standard socket out of the 475, put in a ZIF, and away I'd...

The old wirewrapper tool finds new life, here. It's good for a first pass, then the single-row header does the detail work.

Thanks Daniël, I was hoping that the various DP8930 cards might map the chip to the same range and behave more or less the same from there. I'm searching now to see if the cards had code in ROM, though. Thanks for the encouragement! Maybe the Cabletron will pay off after all. finkmac...

I've been distracted by an `040+CDROM+Ethernet Mac I literally found. It should be complete in a day or two, and become the workhorse Mac for restoring (and perhaps actually diagnosing) other Macs. I daydream about finding an internal SCSI CD-RW for it. Then I plan to return to getting both of...

I bought before thinking about it and will soon own the Cabletron SE (as in, not SE/30) ethernet card. Any hopes for this same diver to recognize and operate the SE version of this? I am also reading up on a Github project that offers an SE and SE/30 board using modern(-ish) chips, where I'd...

Ok time to shut this topic down. I am embarrassed. After all that, it appears to have been the stock Apple SCSI internal ribbon cable. I did a fair job of coming up with configurations trying to isolate this, but partly due to having too few spare cables, and partly due to my failure to suspect...