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karrots

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  1. karrots

    Color Classic / SCSI2SD v5.5 not terminated

    Good point. If it's not on there is a bug in the firmware. When both devices are on the bus the activity light for the SCSI2SD stays on 100% of the time. If the SCSI termination is like other multiaccess busses in electronics the resistors are there to prevent reflection of signals on the bus lines caused by the unterminated ends. So no termination would create erratic noisy behavior on the bus line. On that note, though the problem may be the Mac not turning off its internal termination when two devices are connected. With the Classic II its a single SCSI bus inside and out. I assume its the same on the Color Classic II.
  2. karrots

    Color Classic / SCSI2SD v5.5 not terminated

    Yea the checkbox is set. If not it would have issues in a single setup as well.
  3. karrots

    Color Classic / SCSI2SD v5.5 not terminated

    I have the same issue with my Classic II. If I have both the SCSI2SD (v6) and the internal drive plugged in it won't boot. Either of them on their own and it boots just fine. Was kinda wondering if it was my recap job or something else but haven't done enough troubleshooting. So it's worth trying each on their own.
  4. karrots

    Treasure trove of floppies

    For any of the official disks it would be best to take a flux image using something like https://applesaucefdc.com/. Then you can copy any potential copy protect as well. Also has a better chance of recovering an aged floppy. You can export other image types after creating the flux image. In addition to any other site please upload to archive.org https://www.archiveteam.org/index.php?title=Rescuing_Floppy_Disks
  5. karrots

    Mac se/30 SCSI2SD version

    I don't think dd can start at a specific location. But you could always merge two images together with cat. Then write the whole image to the SD card and set the disk start locations properly in the SCSI2SD utility. I did something similar where I wrote out my image to the first part of the disk. Then just told the SCSI2SD there was the second disk starting where the other disk left off. I then formatted it on the Mac and use it as my scratch space. So in the end I have 2x 2GB physical disks that show up. Then inside the computer you could always run the installers again on the second disk rather than have to mess with merging images.
  6. karrots

    Macintosh Classic compatible EPROM

    Via the schematic, I found the original chip is a TC534200. I was able to find this cross reference for compatible EPROM chips. Unfortunately, they are all out of production but there seems to be a fairly decent stock on ebay/Aliexpress. Unfortunately, it's not pin-compatible with the 27C4096 as that is still available in the OTP form from Digikey. (4M) 256k x 16 / 512k x 8 mask rom AM27C400 / MX27C4100 TC534200, MB834200, HN62404,HN62424 23C4000 <pin 12 OE,OE/ programmable> A17 1 +-v-+ 40 A8 A17 1 +-v-+ 40 A8 A7 2 | | 39 A9 A7 2 | | 39 A9 A6 3 | | 38 A10 A6 3 | | 38 A10 A5 4 | | 37 A11 A5 4 | | 37 A11 A4 5 | | 36 A12 A4 5 | | 36 A12 A3 6 | | 35 A13 A3 6 | | 35 A13 A2 7 | | 34 A14 A2 7 | | 34 A14 A1 8 | | 33 A15 A1 8 | | 33 A15 A0 9 | | 32 A16 A0 9 | | 32 A16 CE/ 10 | | 31 BYTE/ PGM/,CE/ 10 | | 31 BYTE/,Vpp GND 11 | | 30 GND GND 11 | | 30 GND OE/ 12 | | 29 D15 / A1 OE/ 12 | | 29 D15 / A1 D0 13 | | 28 D7 D0 13 | | 28 D7 D8 14 | | 27 D14 D8 14 | | 27 D14 D1 15 | | 26 D6 D1 15 | | 26 D6 D9 16 | | 25 D13 D9 16 | | 25 D13 D2 17 | | 24 D5 D2 17 | | 24 D5 D10 18 | | 23 D12 D10 18 | | 23 D12 D3 19 | | 22 D4 D3 19 | | 22 D4 D11 20 +---+ 21 Vdd D11 20 +---+ 21 Vdd
  7. What EPROM parts are compatible with the Macintosh Classic logic board?
  8. karrots

    Mac se/30 SCSI2SD version

    I had similar issues on a Classic II the system 7.5.3 install would hang building the system file. I ended up doing all updates with Basilisk II then writing the image to the SCSI2SD. After that all is well. Base image with system 7.5 or 6.0.8 minimal system here https://www.savagetaylor.com/downloads/
  9. karrots

    Mac se/30 SCSI2SD version

    I personally use this guy's image. Then either copy the update files in using HFS tools on Linux and boot on my Mac Classic or mount the image in Basilisk II per his instructions, update the minimal system to system 7.5.5, then write the image to SD card. Using Basilisk II the install stakes only a few seconds. He also has various tools in the image like Lido. https://www.savagetaylor.com/downloads/
  10. karrots

    Mac se/30 SCSI2SD version

    But that list is just a list of devices people have reported success. Not necessarily a definitive no it won't work it wasn't designed for it type list
  11. karrots

    Mac se/30 SCSI2SD version

    Do these problems persist with the latest firmware? Mainly past the fixes from early this year for data corruption and booting issues?
  12. karrots

    Mouse bottom pads

    Both of them from the bottom of an original Apple Desktop Bus Mouse. I also have a Apple Desktop Bus Mouse II but I think that one still has all of its pads.
  13. karrots

    Mouse bottom pads

    What's the best way to get source new pads for the bottom of old ADB mice that have lost them?
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