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CharlieFrown

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  1. Hi, Is it possible to damage Macintosh Plus keyboard chip with changing keyboards or/and cables while computer is on? Today I tested my two M0110A keyboards with Plus and self made modified cables (none of them were regular phone cord). One of my keyboards worked fine while using old version of Mac Paint in typing mode. Then I switched the keyboard while computer was working and now none of the keyboards work! I tried different cable while the computer still on - nothing. Maybe I should clean the keys and metal pins that connect the cable. Any other things you would try guys? BTW my analogue board had a toasted capacitor 0.47 uf 250v (x), which I replaced with 0.50 uf 250v, the only one they had in store, if it has anything to do with this issue.
  2. CharlieFrown

    512K: weird keyboard issues

    wow thanks for such detailed explanation guys! After WD40 treatment described by you and Larry Pina in his excellent book now all the keys work like charm.
  3. CharlieFrown

    512K: weird keyboard issues

    ok cool, thank you guys. I applied some wd40
  4. CharlieFrown

    512K: weird keyboard issues

    ok thanks Slomacuser. Here's an update: I sprayed some alcohol underneath the non working key like "A", now it's stuck typing "aaaaa" on screen like crazy and it doesn't respond to the other keys. I want to access the area under the white switch to clean it, but it's totally different than Plus keyboard.
  5. CharlieFrown

    512K: weird keyboard issues

    Hi, Happy holidays. I have this Mac 512k with European Qwerty M0110B keyboard (M4 M011OB). However noticed some issues: - some single keys like A D, F do not work at all, what might be the problem? These white switches need replacement or some PCB contact points need silver glue? - when I use old version of Paint (2.0) the keyboard gives me totally weird input - enter works like I, z acts like x, x acts like C, the space bar doesn't work at all, while the key next to it works like space. I checked the cable with Plus keyboard and it works just fine. Any clues would be appreciated. Thanks!
  6. CharlieFrown

    Mac Rominator issue

    Hi, I have a Mac Rominator installed in my Plus, I get the customized chime, welcome screen, but when I press "R" the Mac gets suspended on Welcome to Macintosh screen. Anyone had similar problem?
  7. CharlieFrown

    ROMBUS - 64 MB flash interface for Mac Plus

    count me in! Interested.
  8. CharlieFrown

    Turbo SE accelerator

    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.
  9. CharlieFrown

    Mac Plus and 2 MB floppy drive

    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 older 53W drive? Thanks
  10. CharlieFrown

    Best games/apps to showcase B&W mac?

    anyone has a list of games that run on unexpanded Mac 128k?
  11. 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.
  12. CharlieFrown

    400k Drive Repair Guide - A Call to Arms!!!!!!

    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?
  13. CharlieFrown

    800k Floppy drive question

    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?
  14. CharlieFrown

    Macintosh SE with horizontal lines, no chime

    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.
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