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Hi, can anyone help me find the driver for Envisio RAM & external monitor card for the Powerbook 100 please? I've tried the Envisio driver that's on Macintosh Garden, but that's for the 030 card that goes in the 140/170 Powerbooks. I think I need EVE V1.0.7 driver.

Hi, further question on this subject. A different Powerbook 100 trackball. Replaced all the usual suspects and still no up and down movement on the trackball. Desoldered the Infra Red transmit and receive LEDs either side of the little spin wheels and lifted off the black plastic bracket...

To anyone following this thread, the eBay microswitches arrived and although they sent the wrong ones - right angle pins and a lever arm over the switch - I snapped off the lever arm and bent the pins straight, and the trackball now works 100% again. The one with the lever arm is also an exact...

The Powerbook 100 is my favorite in the series. I've bought five of them now from eBay UK in faulty /untested condition (usually pay £80-£90 each), and managed to make them all work again. They all required new LCD caps, new SMD mainboard caps, and the Conner hard drives required tape over the...

This microswitch looks like the same footprint : https://www.ebay.co.uk/itm/195956821401?var=495808884160

Update: Changed the two SMT transistors, no change. Also then changed the four SMT diodes and it works again! One of the microswitches for the top button doesn't work, but the bottom button does. I'd already desoldered and resoldered the microswitch as it seemed inconsistent. Might try stripping...

Update: swapping the trackballs around fixes the issue with the original Powerbook 100. I've tested the resistors and capacitors on each trackball next to each other and they all match. Some different results on the two transistors (1AM) and four diodes (BAV99), so I spent around $5 on them from...

Further update. The Powerbook 100 with the keyboard/mouse issues works perfectly if I unplug the internal trackball - the internal keyboard works and an external ADB mouse works. If the internal trackball is attached, the keyboard and external ADB don't respond. Tomorrow I'll try swapping the...

UPDATE: I solved this problem. I bought another Powerbook 100 and swapped the daughter cards around, this fixed the sad Mac error so I knew the daughter card with the processor , RAM and ROM on it was the issue. I used the pointy end of pair of tweezers to push each of the legs sideways on the...

Hi, I could do with some expert advice on a Powerbook 100 I have. About a year ago I recapped the screen panel and partially recapped the mainboard in my Powerbook 100 and got it working. I didn't clean the whole board, just around the caps with IPA and cotton buds. Around 6 months ago I...

Hi, I have a 512K Mac with an odd floppy drive related problem. I've narrowed it down to the mainboard by swapping parts around between another perfect 512K system. The floppy drive will read, but it won't write. If I use a Floppy Emu instead, same issue with a floppy image file I boot from. If...

Pleased to report that the 512K Mac is fully working again. I fitted 16 matching 41256-15 chips from eBay and it worked straight away. So they either don't like 120ns chips or/and mixed speed chips. In the end I had a dead 68000 processor and 4 dead RAM chips. I now have a 512K Mac with socketed...

Made some more progress with this 512K Mac today. I received 2x 68000 processors from eBay and 64 pin DIP socket from Mouser. Today took out the suspect 68000 which only produced screen bars. Soldered in socket and tried a 68000 processor. Now get a raspy bong noise and what looks like a 020800...

Thanks for your reply. I have some 64 pin 2.54mm pitch IC sockets coming from Mouser and have ordered a couple of old 68000 processors from eBay. Hopefully it will live again. If that doesn't work it's looking for shorted components and checking traces - at least I have a working and dead 512K...

To anyone else following this item. I've now made some more observations using a scope and multimeter. The -5V is being correctly generated by the 7905CT voltage regulator on the 512K board. The +5V, +12V and -12V are all correct too. The clock signal is around 16MHz at pin 1 of the LS04 and...

I originally posed this question a little over 12 months ago https://tinkerdifferent.com/threads/help-needed-with-dead-mac-512k-board.499/#post-2954 and received many helpful replies. I've recently got around to removing the 18 DRAM chips and socketing them. When I chip-tested the 41256 DRAMs...

Hi, my analog board is okay now. Tested a Plus board in the 512K chassis successfully. And also tested the 512K board in a Plus chassis and that fails. The Roms are okay too as it does the same thing with the stock ROMs or the ROMinator. It could be a dead RAM chip or other component, but I...

Hi, yes, just tried it hanging off the 512K chassis and also a Mac Plus chassis, does the same thing with both.

Hi, I've attached a picture of my 512K Mac and the pattern on the screen at start-up. Until yesterday it worked more or less perfectly but would hang sometimes and exhibited issues associated with under-volting. I'd fitted a Rominator to it and it ran fine from that. Following Larry Pina's PDF...