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    Software Developer / Applications Engineer

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  1. rickrob

    Color Classic Mystic Mods

    I settled on 36Mhz, as I started getting video artifacts at higher speeds. If you can find 70nS VRAM, you can go to higher speeds.
  2. rickrob

    Color Classic Mystic Mods

    I used this one: https://web.archive.org/web/20030225181154/http://gabezing.sytes.net:80/lc575-40mhz-e.html
  3. rickrob

    Color Classic Mystic Mods

    Looks great-- I've been thinking about doing this mod to my Mystic. I'll probably recap the Analog Board while I'm at it. How readable is the screen at that resolution? Have you thought about overclocking the CPU? There's a mod for that as well-- Mine runs at 36 MHz.
  4. rickrob

    help me saving my SE/30

    The vertical lines are most likely an open trace to IC UE8. You'll need a meter to check continuity. Check the traces from UE8 to UC6 and UC7. Specifically VID0 to VID7
  5. rickrob

    What vintage macs do you own?

    Forgot my OneScanner and LaserWriter 4/600 ps ...
  6. rickrob

    What vintage macs do you own?

    That's where I found my SE/30! On the side of the road, with an external hard drive. That started me in this hobby again. I have: SE/30 Color Classic / Mystic 040 IIci IIx 6100 w Sonnet G3 G4 Cube with Dual 500's / 15 Inch Studio Display Powerbook G3 500 Pismo Powerbook 520c and 540c Powerbook G4 17 1 Ghz Mac Mini G4 1.25 Mac Mini G4 1.42 Newton MP 120 LaserWriter IIg StyleWriter 1200 CD 300e Data Modem 2400 iPods: iPod Classic 2nd gen, iPod Minis, iPod Classic 5th gen, iPod Nano 3rd gen. iPhones: 3G, 4S, 5S
  7. That's a great score-- Always wanted another Newton 2000 or 2100. Had a 2000 years ago.
  8. This is the Bus Master Card
  9. I've seen these Mac II Bus Master Cards pop up on eBay, and wondered what this card would be used for. I never saw one of these cards in any Mac II I ever worked on, so when were they typically used? AFAIK, bus mastering had to do with multiple devices on the bus staring DMA transactions / without going through the CPU -- Does the Mac II bus master card increase performance, or just enable the bus mastering functionality?
  10. I have the original extended keyboard for my Mac IIx. All the keys are good, but I can't figure out how to turn on the Num Lock or Scroll Lock and get the light to come on... I've tried a bunch of combinations with the shift, option and command keys. The LED's a good. What are the key combinations to get those lights to come on? Edit: Ha. 2 seconds after posting this I figure it out. Shift->option
  11. rickrob

    Does anyone have a Mac286 Manual?

    All good-- Norton SI sees the co-processor.
  12. rickrob

    Does anyone have a Mac286 Manual?

    Thanks for the info. I'll leave that jumper right where it is...
  13. rickrob

    Does anyone have a Mac286 Manual?

    Thanks, I didn't even remember that program anymore.... it's been so long since I ran DOS, I almost have to start over. That jumper could be for adjusting the clock as you mentioned. I have to check again, but I think the trace from the jumper goes to pin 39 of the 80287, which is labeled "CKM". Maybe that is an abbreviation for Clock Multiplier. I'll verify that again over the weekend.
  14. rickrob

    Does anyone have a Mac286 Manual?

    I'm still running DOS 3.3. Guess I could upgrade to DOS 6, but trying to stay 80's vintage correct.
  15. I'm looking for the settings for a 3 pin jumper next to the 80287 math co-processor socket. It is labeled J4. My guess is it enables the co-processor. I have a 80287 in mine but I'm not sure how to tell if it is being recognized.