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  1. Bolle

    another simasimac

    You actually want to test between the actual CPU and the ROM socket because of the way the traces are run on the board. They go from CPU passing by the ROM, then the FPU and end up at the RAM slots. The point of failure lies between the CPU and ROM SIMM (either from the cap that’s sitting there or the battery if it leaks) If you test between FPU and ROM it is more likely you are not detecting a possible failure. I have been fixing a lot of boards with several issues (simasimac included) and most of them needed a lot of poking around to find the issue. Any resistance in traces should not matter. Most multimeters will cut out at a certain resistance when set to continuity mode. That cutout level should be low enough to not become a problem on those old boards and the switching speed and driving power of those old components.
  2. The IIci has onboard ROMs. The SIMM is optional. When a IIci does not power on you usually have two sources for that error nowadays. First you will have to recap the logicboard. The power-on circuit relies on a feedback circuit that involves caps and also those exact caps will do further damage to logic ICs in the startup circuit if they leak. If your Mac starts up normally afterwards you are good to go. If not you have to check the power supply as well. There is a weak spot in them as well. Don’t nail me down on the exact procedure but you are on the right track with the 5V trickle voltage that dwindles down over time while the machine is plugged into a wall outlet and isn’t enough in the end to trigger the feedback circuit on the logicboard.
  3. I was under the impression that sound was only an issue with 030 accelerators. There were software patches from the various manufacturers but I didn’t see a single one that fixed the crackling sound issues completely. I also got the impression that the better the sound gets the slower any graphics related stuff gets. That’s especially bad for games. I always wanted to do a comparison between the different software drivers and fixes for the sound issue and how they affect performance. You seem to actually understand something about how all that software stuff works. How was sound played back? There must have been calls as well for either sound generation and sample playback. Both cases seem to be affected by accelerators. Even the sound control panel has crackles and pops while putting out the alert sounds as you choose them, so it must be related to some lower level stuff and not the way sound playback is called from software (assuming Apple itself did it their way using system/toolbox calls and not using some magic)
  4. Bolle

    another simasimac

    That’s going to be a pretty boring video. In short you get out your multimeter, set it to continuity mode and probe every single signal between ROM slot and wherever the signal is supposed to go (CPU for the address and data lines and GLU for the select and enable lines) Repair with a patch wire in case something does not check out. Check if the ROM SIMM is seated correctly and all springs in the socket as well as all contacts on the SIMM itself are clean and are not corroded prior to doing any trace checking. The SE/30 has a notorious problems with proper contact at its ROM socket.
  5. They didn’t have variable clock speed in the MDD. It does not throttle, it just crashes when it’s getting too hot. Possible the 7800 clogs up the bus with whatever it is doing which affects overall performance. The bus in those G4 machines has been a bottleneck more or less since the beginning.
  6. Most of the time it is due to the different cache strategies on the newer CPUs which breaks stuff like timing calculations that rely on how long it takes to run a certain of loop or something along those lines.
  7. Bolle

    Possible Micro Xceed card?

    This is the backpanel from a SE/306 card. No internal grayscale on that one. The switch on the back is to tell the card if you have a monitor connected or not as there is no sense circuit on the card to detect a monitor. The internal screen will always be on no matter if you have a monitor connected to the card or not. If it doesn’t come on on the SE/30 you bought you will have a different problem with the logicboard or analogboard/screen.
  8. Bolle

    Daystar Digital Turbo601

    It doesn’t boot in the SE/30. It hangs hard early in the hardware setup stage. If it would have been a simple hack to get things going Daystar would’ve done it. They already struggled to get this thing working in anything but the IIci which it was designed for initially.
  9. Bolle

    another simasimac

    Check the traces between ROM and CPU. No chime usually means you have a problem there. Vias do not always come with solder in them. As long as you did a good job cleaning everything and there is no goo left inside the vias you can leave them that way. You want to check the corresponding trace though to see if the via is actually still connecting both layers.
  10. Bolle

    ASANTE MacCon+ TK/TP problem

    You don't necessarily need the Asante driver. The card is based on the ST NIC chipset and will work with the generic Apple drivers that come with the system software as well. The card has to be present in the Mac while the system software is installed though, otherwise the drivers won't get installed. The installer should see the card without the breakout board attached. As the others said if you have a driver installed you should see an ethernet device in OpenTransport TCP/IP panel (or MacTCP if you have got that one installed) If you got that it is most likely a problem between your network equipment and the old Mac. Those cards back then did not support any kind of auto negotiation and most modern switches or home routers fail to see that they should fall back to 10mbit/s. Normally I would say take a step back and see if TattleTech or Newertech SlotInfo shows if there is a card installed just to see if your card is good at all. Might be a problem to get that one onto your SE/30. You might want to set up Mini vMac on your Windows machine. That way you can extract all kinds of archived files that you downloaded and shove them into small disk images that you mount inside vMac. If you're doing it right you can dd those images onto real floppies afterwards.
  11. Bolle

    68K (no Mac) Designs OK?

    I would love to hear more on that. Got your thoughts/ideas/design/whatever you got so far documented somewhere in a blog or something like that?
  12. So you are getting fast chimes as well with no RAM installed? That means it fails somewhere before it even tries to use RAM at all, otherwise you would probably get slow chimes if RAM there would be problems accessing RAM. Do you get anything when you use a Nubus video card? I suppose the green stripes occur with a display connected to the onboard video? I would guess that ROM is fine as you are getting chimes. Does the SIMM you tried contain a IIci ROM or did you use a ROM from a different machine? This could explain different behavior of the onboard video when using two different kinds of ROMs. I would guess there is a broken trace somewhere. Got any high res pictures of your board? Any obvious signs that it has been sitting with cap goo doing its thing?
  13. Bolle

    Scored a IIfx lot with extras

    Sweet. That lot was a steal. It had been sitting on ebay for quite a while if it came from the auction I think it of... How bad is the damage on the second IIfx? I have been looking for a fixable IIfx board now for some time already.
  14. Was the Comm slot card present when installing? The drivers are only installed if the installer detects an ethernet card.
  15. Bolle

    Mac SE/30 SCSI problem

    4.75V is perfectly fine. Get your hands on the schematics and measure all other signals going to the SCSI chip: -data and address lines between CPU, PDS or ROM SIMM and SCSI chip -chip select, DACK and read/write signal lines between GLU and SCSI chip -IRQ and DRQ between VIA2 and SCSI chip One of them is probably bad. Does your board boot fine from floppy?