Jump to content

ymk

6502
  • Content Count

    53
  • Joined

  • Last visited

1 Follower

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. Amphenol 10127820-1422LF mates with the cable. The pins in the cable should be either 10134170 or 10127817.
  2. The current through the LED and resistor is the same and the sum of the voltage across each add up to 5V. Typical forward voltage through red and green LEDs is 2.1V. This leaves 2.9V across the resistor. 2.9 / 180 = 0.0161 A. Voltage across the LED will increase slightly with current, but this is negligible. For blue/white LEDs with a forward voltage around 3.6V, the same resistor would pass less current.
  3. Any LED that can tolerate 16mA will work fine there. If you want to reduce brightness, you can replace R111 with a higher value.
  4. I'd look at the brightness pots, both the external and the trim.
  5. I am biased since I sell it, but I recommend the MacSD, which can handle hard drive and CD images, and recently, floppy/partition images as well. You can mount multiple floppies at once and work with them at SCSI speed. No reconfiguration via USB is required. Also, changing cards on a Classic can be very easy with some modifications.
  6. Firmware v0.10.0 is now available and adds a new "composite" device type. This allows the use of multiple partition images (floppy, MiniVMac, etc) under a single SCSI ID. ProDOS and FAT disks work with the appropriate extensions. Once a directory is bound to a SCSI ID in the config file, images added to that directory are included automatically. Up to 60 images total may be mounted. This update also fixes issues noted by @cheesestraws: Partition type 0x0B is accepted in addition to 0x0C (except for firmware updates). Filenames in the config file are now case insen
  7. There's no active audio circuitry on the analog board. The speaker runs straight to the logic board connector.
  8. I'm thinking this as well. Looks like only half of the VRAM is available to the main bus, but all of it is being displayed. A stuck VADR line into the muxes can result in portions of the display repeating, but that's not what you have here. I'd look closely at the lower A lines. Are you checking these with a scope or DMM? A continuity test won't tell you about a short to GND, etc.
  9. Very cool. Though my PSU is working fine, this could allow a quieter cooling solution. A charge pump might be another way to get the -5V rail if current requirements are low.
  10. I have been running a fanless, clear case SE with a MacSD 24/7 without problems. The PSU PCB is not enclosed for visual and cooling reasons. It pulls 28 Watts from the wall and the hottest point I can measure with IR is 51C around the flyback transformer. However, I'm not sure if the @maceffects case passes IR. My Classic, which also has no hard drive pulls 30W, but has a slow 80mm fan to keep it cool.
  11. If you send me one, I could print you a set made of TPU at a reasonable cost. PM me if interested.
×
×
  • Create New...