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ymk

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Everything posted by ymk

  1. I make these with NOS ICs. $26/ea shipped to the US. Edit: These are 256KB This same PCB accepts four ICs on the opposite side for 512K, so if there is demand, I can have them made quickly. The chips for the two module sizes have different row/column dimensions, so a 512K module cannot be made with chips from a 256K module.
  2. Nice presentation. MacSD is listed as not having floppy support. While it doesn't emulate a physical drive, it does support mounting multiple floppy images at once. I also noticed SCSI2SD is listed as having floppy support. What is the extent of floppy support on the SCSI2SD?
  3. Guessing here... to retain the memory through a battery swap.
  4. Correction: Noctua NF-R8 Redux
  5. be quiet! Pure Wings 2 80mm, BL044 Noctua NF-B9 redux I run those in my PM6100 and Centris 610 at reduced speeds and they are virtually silent. Convection cooling isn't viable for these machines. With no fan, the top of the PSU will get hot, but even a slow fan keeps it near ambient. Neat project. Would feeding TTL directly to the Mac's opposite input pin work?
  6. Video favors lower capacitance so some cables use extremely thin wires. ADB needs low resistance. Go for heavier gauge wiring or build your own cable. I would not add external power to the bus. Measure the 5v delta at the end of the chain vs at the Mac and do the same for ground.
  7. Amphenol 10127820-1422LF mates with the cable. The pins in the cable should be either 10134170 or 10127817.
  8. 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.
  9. Any LED that can tolerate 16mA will work fine there. If you want to reduce brightness, you can replace R111 with a higher value.
  10. I'd look at the brightness pots, both the external and the trim.
  11. 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.
  12. 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
  13. There's no active audio circuitry on the analog board. The speaker runs straight to the logic board connector.
  14. 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.
  15. 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.
  16. 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.
  17. If you send me one, I could print you a set made of TPU at a reasonable cost. PM me if interested.
  18. Probably. I don't know of any replacements offhand, but Mouser is a good place to start.
  19. Measure the resistance. It's not worth risking the audio circuit over a questionable speaker.
  20. It's not exactly a fair comparison. Macs couldn't paint the entire screen with 320x200 like PCs could. Slow Macs had to either play in a tiny 320x240 window or use pixel doubling, which still had a cost. Unlike pixel doubling, the every-other-row rendering in Duke Nukem 3D actually reduced video bandwidth, speeding up the game significantly. On the other hand, 640x480 meant when Macs got Command & Conquer, four times the battlefield area was visible, making it a far better experience.
  21. Why not run native 68K Doom?
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