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  1. Level 3 caches didn't exist until 1995 in DEC Alpha 21164 machines, probably only the big ones that would sell for minimum $30,000 or so. It didn't re-appear again basically at all anywhere else at all until 2001-2002 when it appeared in some POWER4s and in the PowerPC G4, where it was used to compensate for the fact that the Mac G4 had a system bus and memory half to a sixth as fast as what you could get in a Pentium 4. Apple used a lot of go-fast tricks on its very highest end systems. I don't think it's inexcusable per se that they didn't happen to stumble upon this
  2. If it were a Monitor III it would have the anti-glare "fabric" on the front. If it were a IIe monitor, you'd still see a greenish tint even when powered off. The connector and Yoke look more modern than the Lisa by a few years. I'd say if they are from Apple products at all, it would be one of the monochrome 12" white phosphor models like the platinum cased Apple II composite monitor or the 12" Hi-Resolution Monochrome monitor for the Mac.
  3. Are you saying that you see what should be the checker board pattern on the video signal? That should suggest that the processor did quite a bit of running and managed to fill the frame buffer with the checkerboard gray background pattern...
  4. I'd have to look into the components a bit more, but my theory is that the older computers with 4.5V battery backups had a 5V CMOS chip acting as the "power manager"(ie soft power, Real Time Clock, ADB in some of our macs). 4.5V represents the low end of a 5V +/- 10% rail. Most of the pre-mac 8-bit machines(Like the Apple II) used exclusively 5V Digital logic(as well as +/-12V analog circuitry). Later machines, including many Macs, had mixed 5V and 3.3V logic as 3.3V was sort of new in the late 1980s-early 1990s. The lowering of voltages(particularly core voltages) was all part of
  5. Hello, macdoogie,

    If you have a Color Classic RGB Power LED/ Button board for sale, I would like to buy one (fully assembled), please.

    I am located in Germany and I could pay in advance via PayPal. Just tell me the total for the board and shipping, and a PayPal address. Snail mail would be preferred and sufficient, as I am still collecting parts for a mystic CC project.

    With best regards


  6. Haha! I used these in college and at my first internship! That HP/UX is likely to have my favorite UNIX desktop manager: The CDE! Also, SCSI is always daisy chained, never "Y-cabled". All you have to do is find a long enough 50-pin ribbon cable and add another IDC-50F in the middle "pointing" the same direction as the one that goes to the end drive. Also, The last drive on the cable is the only one that should be terminated or have it's active termination enabled...
  7. I realize there are already SCSI to SD, CF etc out there, and all of these seem to have various issues with setup. I had once planned to make a version of my own, but not utilizing Compact Flash or SD Cards. I figured I'd just make a true Solid State SCSI drive with flash chips right on the board. I mean, do we really need 64 Gigabytes of storage for our vintage machines(I know, I know the old Macs can't even use all that )? I figured on making a SCSI-1 only, with a capacity of somewhere between 128MB and 1GB depending on the flash densities available(I'd likely use SPI based flash). I'd also
  8. Is your IBM drive an Apple OEM? I know Apple used IBM drives in the early-mid 1990s. Common sizes were 80MB, 160MB, and 320MB. Non of the "Apple Logo Sticker" drives should need an external terminator...
  9. Who would have thought that Orange would look so good on a monochrome Mac? Actually, many years ago I discovered that the Green CRT in the small Apple IIc monitor is the exact same size and fit as the original Mac. I retrofitted one of my Platinum Mac Plus machines with the green CRT which was pretty cool. I believe I had to swap the Yokes over as the IIc one had a different harness or something. It's quite possible that a collector buddy of mine still has that machine 20+ years later. Now I'm gonna ask :P
  10. macdoogie


    Looks like the main difference between TTL video and the Mac's built in is mainly the polarity of the HSYNC and VIDEO signals. Perhaps that mystery signal is just tapping off of the raw video "shift register" circuit to avoid the need to add an additional inverter chip? Hmmm, I may have a copy of the MacPlus Logic board schematic somewhere in my archive.... Also, I agree with whoever above identified this as a plasma display. The Orange color gives it away. It also could be one of the earlier electroluminescent technologies. The contrast looks far too good to be an LCD of that vint
  11. It's true that Apple designs have used both Tantalum and Electrolytic. Although, in more recent years, they switched from Tantalums to "PosCaps" i'm guessing largely due to Tantalum being a conflict, or "blood" mineral. Still, on older boards, you'll see a mix. One obvious reason is cost. Tantalums are certainly more expensive than the old Aluminum electrolytic. However, the function of the capacitor it also a big factor. The basic uses for capacitors in a circuit are Bypass, Filtering, Decoupling, and Bulk. Some of these characteristics overlap of course and all are frequency dependent with a
  12. It's definitely not related to the capacitor voltage rating. Higher is always safer. Not necessarily always better, as the other characteristics change with the voltage rating like value derating(That 22uf is only 22uF at a certain range of temperature and voltages), and Equivalent Series Resistance. The latter is why I generally don't replace aluminum "cans" with tantalum caps. Tantalums have higher ESR and also when they blow it's pretty for a second, then not so pretty afterwards. Still people use them and they probably work fine under most if not all situations. I just like to use the form
  13. Are you sure that's an SVGA monitor? From the finder screen displayed above it looks like it's running 640x480 and not 800x600. When I modded a color classic to run at 800x600, it seemed clear that the dot pitch(stripe pitch actually on a Trinitron) wasn't quite fine enough to handle the 8x6 resolution. From my understanding the 9"(some call it 10"?) CRT was the same as Sony's famous studio monitors which were for older SDTV 480i resolutions(Actually 525 lines, but not all are visible).
  14. These newer industrial replacement displays actually use modern TFT technology like IPS, A-Si, and have LED backlights, so you can get ones that look pretty good. The Trinitron would win on contrast ratio, but at 640x480, the TFT would be sharper than a VGA modded Color Classic. Even at 512x384 the color classic can get fuzzy requiring a tradeoff between focus at the center of the screen or at the edges. Also, I'm still thinking about a replacement rear case to convert the CC into a slim, flat panel version with the MLB mounted vertically and the I/O ports facing down. The SCSI HDD would be re
  15. I noticed that the 8.4" screen chosen was one with an LVDS interface. The same company that makes that screen(Looks like Tianma may have purchased NEC's industrial TFT division?) has the same panels with a TTL interface, which is the more traditional RGB+HVC parallel interface. Those "everything-in-one" controller boards usually have both outputs present, but I'l like to make a more dedicated controller board that doesn't have a ton of unused connectors or need the OSD menu + buttons to work properly. Actually, I believe for the Color Classic, I can create a whole new analog board
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