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trag

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About trag

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  • Location
    Austin, TX
  • Interests
    Model & Amateur Rocketry

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  1. So did any software use them? I remember purchasing a PAS16 way back when because it was very cheap. It came with a free copy of "Out of This World" which claimed it would make use of the PAS16 if present. The sale was so good, it was actually a pretty good way to get the game... I don't recall being able to tell any meaningful difference in the game's sound, though.
  2. trag

    how to remove cpu from Quadra 840 AV

    I use the long edge of a metal PCI slot cover. The 68040 is held in the socket by friction. It often pops loose quite suddenly. So, you start applying enough force to get it out of the socket, suddenly it's loose, and the edge/corner you were prying on lifts up into the air, leaving the other end in the socket. Voila, bent pins. A special tool that lifts all edges straight up, simultaneously would be ideal. Lacking that, use something that is not a long lever (like the PCI slot cover's long edge). That way, even if the chip does suddenly come loose, you can't lift the edge any higher than the length of your lever. Note: If you're using the long edge of a PCI slot cover, then the length of your "lever" is the narrow width of the slot cover. Another option is to pry by gently inserting a flat head screwdriver and then gently twisting the screwdriver. There, the length of your lever is only the width of the screwdriver.
  3. On a related note, what did adding a PAS16 card to the Macintosh really get you compared to the built-in sound capabilities? The four-input mixer? Anything else?
  4. Some leakages, such as from an alkaline battery will be basic instead of acidic and so vinegar is an appropriate neutralizing agent. I'm not sure where the pH of capacitor goo falls, or Lithium batteries for that matter. I think the 1/2AA is some kind of lithium chemistry, or am I misremembering?
  5. trag

    Solid State Drive for G3?

    The thing to know about most (all?) power supply connectors is that they are a plastic housing filled with pins. The pins and the housing are sold separately. The pins crimp onto the ends of wires. Then the pins snap into the housing. There's usually a little "latch" or prong (or two) that hold the pin in the housing after it has been inserted. So, if you want to rearrange the wires on a connector, you can carefully remove the relevant pins from the housing (depending on the brand/model of housing there are often dedicated tools available, though improvising works too) and insert them in the hole to which you wish to move them. Of course, new pins can be bought and crimped onto the ends of cut wires and new housings purchased. The trick in the latter case is knowing which housing/pins you need.
  6. trag

    PRAM won't zap?

    That's what I remember. You should double check though, because my memory is hazy.
  7. Thank you for the links. You are indeed correct. The Hardware Developer Note says that Heathrow contains a MESH controller. Color me surprised. I thought/expected it was basically CURIO with extra stuff brought inside. Although, CURIO was an AMD chip, so maybe Apple didn't have access to all the rights/designs, or something and had to make Heathrow from scratch. On the other hand.... Wandering into speculation country.... The separate Fast SCSI bus first showed up on the NuBus PowerMac 8100 and 9150. It was based on the 53CF96 which was made by a number of folks. I'm not sure where the design originated, maybe NCR. But AMD also sold one and I think Zilog might have as well. NCR mutated into Symbios (?) and later LSI Logic. The separate Fast SCSI bus on the next generation, the PCI PowerMacs, used the MESH controller, in exactly the same package as the 53CF96. I strongly suspect that the MESH is just a licensed version of the 53CF96. Or, perhaps, Apple's home rolled version to avoid licensing fees? In the volumes they were using, it may have paid to roll their own. One of these days, I'm going to replace a MESH with a 53CF96 or vice versa and see what happens. Meanwhile, the CURIO chip which first appeared in AV Quadras and was used in both the NuBus and the PCI PowerMacs, contained a 53C94 or 53C96 cell. In all those machines the CURIO chip provided the slower internal/external SCSI bus, as well as serial ports and ethernet. The 53C94/96 is closely related to the 53CF96. So, I wonder, if Heathrow was an Apple design, and they put a 53C94/96 in Heathrow, would it be inaccurate for them to claim that Heathrow contains a "MESH-based SCSI controller". I am also now curious to see what SCSI Probe says about the Beige's built in SCSI bus...
  8. trag

    PRAM won't zap?

    The Beige G3 can run off of a standard ATX power supply. There's a jumper on the motherboard to switch it between expecting the Apple PS in the desktop case, or an ATX style supply, which, IIRC, is in the tower case. Look up the detials somewhere reliable before trying it. My memory is vague except that the jumper exists.
  9. trag

    Fast 601: PowerComputing Power120

    It's really a pity that Powerwatch.com went away. There was so much collected wisdom on the Power120 on that forum. It might be worth contacting Jeff Keller (of Digital Camera Resource Page fame) to see if he still has an archive of PowerWatch. It would make a nice addition to the materials here. Pretty much every nuance of Power Computing machines was poured over in those forums. Jeff Keller ran PowerWatch before his Digital Camera page. https://www.dpreview.com/about/staff/jeff.keller I would recommend replacing the heat sink grease as well. Carefully, don't want to shatter the CPU. Also, I have this really faint (unreliable) memory of reading reports from folks who found a coin cell in the power supply that needed replacing eventually. Might make sense as the power supply is a weird hybrid between AT and ATX. Even when new, the Power 120s ran hot. Do you have the flat griddle heat sink or the raised cage heat sink? The former allows you to put longer NuBus cards in the lower slots, but the latter provides better cooling, according to PCC back in the day. I ran one as my main machine for several years back when they were almost current. They got cleared out at the beginning of the PCI era for, IIRC, $600 (or was it $1200, might be confusing the S900 price with the Power 120). Anyway, I had a JackHammer in there with two ST32550W drives, an ST32550N on built-in internal Fast SCSI and another ST32550N on the internal/external slow SCSI bus, with FWB's RAID ToolKit tieing them altogehter into a four drive striped array. The weird thing was, I had tried four ST32550W drives on the JackHammer, but after two drives, I didn't get any improvement in performance. Adding each of the narrow drives to the other SCSI busses bumped it up another 2 or 3 MB/s. As it turns out, even though the ST32550W/N was a "Barracuda" drive and spun at 7200 RPM, it was one of the very first in that line. It only delivered about 6 MB/s regardless of what kind of interface one connected it to. In a RAID there were diminishing returns, such that all four drives together only delivered about 14 MB/s. Boy, those early 7200RPM drives were noisy too. I ended up buying some speaker sound batting and installed a layer on the side covers of the Power 120 case to absorb the noise from the Barracuda drives. I had two 20" Radius Intellicolor monitors, IIRC. One on the HPV card and the other on a Radius IV GX 1360. Those monitors were huge and needed about 1' to 18" between them to avoid interfering with each other. Good times.
  10. The way I remember it (need to check the developer notes) the Beige G3 actually uses a 53C96 or 53C94 cell for its SCSI support, but (and I may be confusing this with the B&W) there's a MESH cell in one of the big I/O chips that doesn't have its signal brought out to pins. It's just there because some part of the OS expects to find it.
  11. trag

    PRAM won't zap?

    It's rev. B or Rev. C. Which is good. But with only one device on each cable, it shouldn't matter any way. So, if you plug in either the CDROM drive or the IDE hard drive into either of the IDE ports, the machine does not boot? If that's the case, one last long shot, try a different memory stick. Why? It's possible that you have a faulty memory location and that the IDE's driver is always occupying the same location in memory, and that the two happen to correspond. Like I wrote, it is a long shot. I'm just having trouble accepting that both IDE ports would be bad. I don't think I've ever seen that in a Beige before.
  12. trag

    PRAM won't zap?

    Do you know what revision of the ROM that Beige G3 has? The Rev. A ROM did not support Master and Slave devices. I don't know if having both on the cable would cause such an issue. I can't remember the numbers actively, but would probably recognize which revision they go with. You can figure the ROM revision by reading the Apple part number off of the two ROM chips on the ROM module (unless you have one of the rare EEPROM built ones) or by booting up and then using Apple System Profiler to report the ROM revision. The latter will be something like $77D.45F1. The former will be 343S0401 or something like that. At a guess, it's more likely there's a problem with the CDROM than that there is a problem with the IDE ports. Could also be a bad IDE cable. Oh, check for bent pins on on the connectors. Sometimes one or more of those gets bent over, instead of going into the appropriate hole, and it gets shorted with a cable is plugged in and pressing against it. Yes, that looks like the caps may be leaking on that VRM.
  13. It's an interesting project, but I'm not getting emotionally invested in any new ideas, until I actually complete some old ones. I'm mostly focusing on making a living these days. It's going well, but takes a lot time. I'm working for Roku and we just got the new 4K TV models to market. Summer was bussssssssssseeeeeeeeeeeeeeeeeeeeeeeeeee. As I understand it, Acard's converter cards contain a custom processor of some sort. It may be a variant on an existing architecture, or it could be something their designers built from scratch. If the latter, reading out hte attached ROM isn't likely to mean much. It's probably full of object code for their custom processor. I'm also not htat convinced that some of their products are ATAPI only or disk only. The ones I've tried work great for both, and I don't see why they'd go to the work to reengineer it to remove abilties. But I'm happy to read actual test results that prove me wrong. My guess is they have one basic adapter design and they've been tacking on different SCSI/PATA/SATA protocols as necessary. I have a book at home titled something like, The IDE and SCSI Protocols. Looking at the command sets, I think Gorgonops is right a few posts up. It's mostly goign to take the tedious work of going through and translating, with probably a few corner cases and special cases where things just don't translate easily or require additional/special handling.
  14. trag

    PRAM won't zap?

    You should be able to zap the PRAM by holding down the key combination either before or after the start up chime. I've read, but am unceratin, that zapping it before the chime actually resets more parameters. Pulling the battery and pressing the CUDA switch should reset everything that is stored in NVRAM/PRAM memory. For that matter, you could just try pressing the CUDA switch, IIRC, near the back corner of the board near the third PCI slot. In cases like this, I recommend you remove the PCI video card, leave in the personality card, you need that, but remove the modem card from it, remove all the RAM but one stick, unplug all the hard drive cables, SCSI and IDE. Don't plug in a keyboard or mouse. Remove the battery. With machine unplugged, hold down the CUDA button for 30 seconds. Leave the battery out. The Beige doesn't need it to boot. Connect a known working monitor which is capable of 640 X 480 @ 67Hz to the built-in video. Power up with the power button on the front (back? can't remember). If you get a good start up bong, wait a couple of minutes to see if the monitor becomes active. If not, try a different memory module. If you can't get a good start up bong or video on the monitor, the problem must be on the motherboard or the monitor. It's unlikely, though possible, all three memory modules are bad. If you do get a good start-up screen (gray screen with disk icon and flashing ? mark) start adding components back. Start with a mouse. Then keyboard and mouse, etc. All that said, here's another possibility... The bus speed and CPU multiplier and cache ratio are controlled by a set of jumpers on the motherboard. Are those still in their original position? Does the machine still have the original CPU module installed? Also, you may wish to check the heat sink grease between the CPU and heat sink. If it's turned to powder, you could have a simple case of the CPU overheating soon after power on.
  15. trag

    Solid State Drive for G3?

    Moot now, but if you have a VRAM module (may be called GRAM in Beige G3) it would be under the modem that is sticking sideways out of your sound card. Behind the voltage regulator and between the RAM and sound/personality card. Also moot, but another thought I had was perhaps the 12" monitor doesn't do 640 X 480? I think there was a small Apple monitor that was fixed at something lower like 512 X ?
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