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bingo! thanks Crutch, problem solved.

Hi,  Until yesterday I was able to format DS/DD disks as single (400k) on my SE/30. But it changed out of blue. When I put in a new disk, instead of seeing regular giving me a option of single, double sided format it shows totally different menu with only 800K and DOS 720K. I didn't mess with...

68HC000 cpu's are used in modern accelerators for Amiga, they are capable of running at 50 mhz(!). Would love to see HC based turbo for 512k/Plus.

Hi,  1) is there any chance the Plus will be working with  SONY MP-F75W-01G floppy drives? I am pretty sure HD (1.44 MB) formats are not available because of older IWM chip, but what about ability to format disk as 400k or 800k? 2) Can I use the stepper motor from the MP-F75W-01G inside the...

 anyone has a list of games that run on unexpanded Mac 128k? 

I am pretty sure the reason of the sad mac is faulty rom chips. Cleaning and reseating them wont do, after 30 years those chips detoriate even they dont show any sign of corrosion. All you need to do is burn replacement roms on couple of 27c512 eproms. PM me if you need them.

interesting, I have a hunch the caps might be the reason my 800K drives do not work at all. Do you have caps list for 800K drives as well?

Despite lubricating and cleaning the drives, they show no signs of life.  Checked those switches too. Any ideas?  If my IWM chip is bad will I be able to boot from external drive?

examine the pins underneath the mobo - might be bent in the way they cause short circuit. Sounds strange, but I had the recapped SE/30 with the same issue. 

hi,  has anyone tried this before?  Check out Classic Mac Tech Docs, v2.0  page 28. "9.2 How to Upgrade the Mac 512K to 1MB (and beyond?...)

do you think I could use 800k drive from the SE with my Plus?

Hi,  I have two 51W floppy drives, which have the same issue - do not respond at all, no spinning, no clicking, checked the eject motor gears and seems ok.  Cleaned the head. Nothing. Nada. No idea what I should do next. Maybe the stepper motor is dead?  BTW I used two different yellow...

Yesterday  I replaced the original ROM chips (giving me the identical bars) with two  27c512 containing Plus ROM images. Works perfectly, chimes, no bars, boots to desktop.  I can confirm that the vertical bars are usually caused by faulty memory or ROM chips. 

I have a Plus with pretty much the same vertical bars, when I swap the ROMs with the MacRominator it boots just fine. 

you could go with a Rominator instead of regular ROM chips. 

Don't get me wrong, but I find it weird when I see people trying to open web pages on 68000 Macs with very slow connection. I mean what's the purpose? I used PowerBook 170 with maxed RAM back in the mid 90s and "surfing" the Internet was no fun at all - apart from IRC, email, newsgroups...

I found schematic here: https://museo.freaknet.org/gallery/apple/stuff/mac/andreas.kann/schemat.html

Hi, I have a SE/30 saved from major caps leakage, apart from recap had to repair some chips and vias to restore video. Still there's a sound issue, you cant hear it at all and whenever the programs call the sound it crashes. For example in Disk Copy it happens when I keep "Confirm before...

The problem is probably easy to solve - cold solder joints in usual place (check Google or this forum).  You wont have to worry about CRT high voltage as long as you dont touch the red anode underneath the rubber cover or flyback. 

ok time to update, my Mac is working fine except for doubled rows of horizontal lines. I tried to make connections as suggested by apm, but unfortunately I get no picture at all. It seems that Plus might be a bit different. Can anyone give me the Plus-specific  chips and pins  connections for...