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zuiko21

6502
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Everything posted by zuiko21

  1. Wow, this thread is getting waaaay cool! I know, I still owe several replies (and research) here... but for the time being I see very interesting the idea of a grayscale SE/30. With the video card issue already solved, this is what I think about the remaining tasks: The grayscale board for the CRT shouldn't be much of a problem for anyone able to make a (simple) PCB. We already got the schematics and copmponents are pretty much standard (read affordable), even the CRT socket, I'd say... Unfortunately, no video card intended for an external monitor will supply adequate sync signals fo
  2. I'll be far from my Macs for a few days (and pretty busy!) thus I can't confirm this for sure, but I believe that even a stock SE/30 should be able to boot from CD-ROM provided that: The CD is bootable The System version is compatible with the SE/30 (up to 7.5.5) That system's configuration is suitable for CD-booting One thing is for sure: such an old Mac won't recognize the 'C' key pressed during startup for CD boot, instead should use the old Cmd-opt-shift-backspace key combo, preferably while hitting (with the tip of the nose ) the number for the CD's SCSI-ID, that way should forc
  3. Hi and thanks (again) for the warm welcome... Things aren't that complicated, just more/new tasks at work with less pay but still can afford some hobbies anyway. Back to our thread, I've been experimenting a bit with the IIsi and the Radius Pivot PDS card... first of all, after this period of inactivity, the PSU is misbehaving a bit -- things like firing up on just plugging and then not powering off (yes, the power button is not at the stuck "server" position) so it's asking for a recap at some point... however, after some warm up period it seems to do just fine for the testing. To su
  4. Phew! Hi again! Sorry for being absent all this time... life's got rather complicated and, among other things, I've been giving birth to my very-own-designed 6502 computer -- now that's retro! Fortunately, things are starting to settle down now, so I'll be back into the delicious world of 68k Macs real soon... currently, the IIsi is sort-of buried below a lot if stuff, I'll try to clean up that as soon as possible. I've seen the schematic of the connection a few posts above... while I was already aware of extended sense codes, it's worth noting the diode placed between the sense lines
  5. I overclocked my Quadra 700 with a socketed 64 MHz oscillator: The hard part was desoldering the ground pin... but otherwise it's a fairly easy procedure. I tried slower oscillators also, for the fun of it: down to 40 MHz is OK; 32 MHz starts having video issues... 24.576 MHz or lower, no boot at all ...but I no longer have the 68040 on it; it currently runs on a PPC601 accelerator card on the PDS, which gets the 64 MHz speed as a bonus
  6. AMAZING! We already knew it was possible, but seeing it actually running is just great If I understand it correctly, if no key is pressed upon power-up, the machine will try to boot from an ordinary disk, right? Could that be modified in order to make the Copy ROM to RAMdisk boot option the default, leaving some key for the disk boot mode?
  7. zuiko21

    CC and C

    Now that you mentioned the roadmap for CC upgrades... the 68LC040-based LC575 board is an easy upgrade, but why the change to a full 68040 is marked on red? Is it really "dangerous"? I expect it to increase heat dissipation, but fitting a small heatsink should suffice, am I wrong?
  8. OK, let's go! (I'm writing this on the SE/30, after checking what you said) So does mine... These are exactly the values I read at $50F14806 if I change the volume setting via the usual control panel... Well, here we are a difeference: mine reads $02. FWIW, at $50F14801 is $01. Done I haven't tried the custom ROM SIMM on the other compatible machines I have (IIx, IIsi, Quadra 700) although I don't think they would show any picture... but the sound should play OK, right? Should I try them too? Any other interesting test to do? All the best,
  9. Phew... After a long time with tons of work, I'm back again Glead to hear the discussion going on. I've had little time to keep twinkering on it, but here's an update/remainder of the state of my research: •The card supplies a 640x870 (portrait) signal, no matter the sense code applied (from the limited selection I tried, that is) with the usual Radius logo on startup. •The card doesn't show up on the Monitors control panel, thus the OS isn't supporting it Most likely I'm not supplying it the proper sense code, as you suggested. Anyway, the card keeps the Radius logo output, as if a
  10. [Wow! It's been a long time since my last post... I've been crazy at work these weeks I hope to catch up soon!] @onlyonemac: If memory serves, I tried every possible value for the register, including each combination of D0, D1 and D3 -- the volume did turn down making the sound quieter... but equally distorted I'm afraid the distortion comes from some other place... BTW, D2 seemed to have no effect, but its value was changed anyway. @Bunsen: Certainly. The big problem about an unexpected OS for these machines (or any old world Mac) is the firmware, which is expecting to boot from a
  11. 2 & 8 MB SIMMs do not work on the SE/30 -- just 256K, 1, 4 & 16 M The IIsi (and I presume the IIci too) seems to take almost anything 30 pin, parity or not, composite or not, including 2 and 8 MB sizes. But the clearance issues aren't unique to the SE/30: the Quadra 700, for instance, has a tighter spacing between sockets, thus some SIMMs with chips on both sides won't fit.
  12. Oh dear... the MacMini is running 10.5.8 -- the system confuses the eight next to the ending ')' for a smiley
  13. Just downloaded, works great on: iMac 21.5" Core-i5, 8 GiB (OS X.7.5) MacMini Core2Duo, 2 GiB (OS X.5. If needed, I can setup the last machine with the originally supplied version of Tiger, for further testing. Thanks again! PS: Any remarkable improvements in mind for the next batch of SIMMs? If nothing big is gonna change, I could take a couple of the current 8 MiB batch
  14. Strange... Please double-check all connections. You did remove the jumper previously used for firing up the PSU, right? Click here for the IIci's PSU pinout -- it's the same as the IIvx, Q800 etc. Also, make sure that the metallic enclosure of the transistor isn't touching any other contact -- some models have the enclosure connected to the collector. If it's in contact with Ground, will likely show the symptom you describe ("always on"). Ditto if the power button on the IIci is at the "locked" position... If all of the above fails, you may try to disconnect the end of the 10K resistor
  15. If I understand your idea correctly, that Universal PSU-Adapter PCB shouldn't be difficult at all... just take my previous schematic (for the IIsi) and connect the lines in parallel for each Mac-side connector. Some lines from the ATX PSU (e.g. the +3.3V rail, unused and thus not shown in the schematic) would go for certain Mac models only (like the 7600 etc). You don't even need to put multiple transistors for soft power... just connect the /PFW lines (Mac side) together to the resistor, like the only one in my schematic. For those Macs without soft-power (LC, compacts...) a simple switch
  16. If I'm not mistaken, power dissipation should be around 1 mW -- won't generate any noticeable heat Good idea! I believe a PCB/Protoboard, no matter how small, would be overkill for such a simple circuit. Maybe this inverter could be installed inside the ATX PSU, alhough it no longer would be compatible with regular PCs... No, it's the transistor the one which does the required signal inversion -- the resistor is only to avoid overloading the transistor. As mentioned earlier, the particular model isn't critical -- the cheapest one you could find is likely to be perfectly valid for switch
  17. Hi! Sorry for being so late to chime in -- very busy going back to work Yup. It was here. It's a very sophisticated paperclip but also the proof of concept that the ATX PSU can be soft-controlled by the IIsi... it's just a matter of placing an inverter between the /PFW line from the Mac and the /PS_ON input of the PSU -- they work just the opposite. As you can see, there's no need to bother with a hex-inverter IC, a single transistor and a resistor will suffice. The complete schematic (sorry for the poor "scan") is: Any small-signal NPN transistor will do, I had a BC-547B at hand but
  18. tt, your idea is quite feasible and interesting! The actual code for displaying a picture is about a 25% of the whole listing, just anything above the line: ;loop for trying every 0x802 value! and could be somewhat simpler with a bit of optimization -- this was a quick-and-dirty approach :b&w: I'm currently on holidays so I don't have the developer resources at hand but I think the simplest way would be concatenating the 22 KB blocks for each picture after the code, then adding an empty loop for the desired delay between pics, and then jumping back to the code without resetti
  19. 80-pin drives usually have no ID jumpers... ID is set via jumpers on the adapter itself. I believe there's no way to activate termination on a 80-pin drive, other than connecting an external terminator. Some high quality adapters include termination, though. I've been successful using large, 68 and 80-pin drives on vintage Macs. It would be helpful to know the exact model of your drives, in order to investigate their capabilities. Drives adhering to the Ultra-320 SCSI interface may or may not support the "narrow" transfers required by our old Macs. On the other hand, narrow transfer su
  20. While many Mac motherboards use a pretty similar form-factor, there are some differences... I have compared the 840AV to the 7600 board, and among other things, the power switch is differently located (left on the 7x00, right on the 8x0). I don't think a 7200 front part would fit the (awful) 800 enclosure
  21. According to my experience, screen shots (Cmd-Shift-3) will only capture whatever screens show up on the Monitors control panel. I have however re-checked this particular case, and it captures only the 512x384 image of the 12" RGB I had at the IIsi built-in video port regardless of the sense code applied to the Pivot's connector -- either from the VGA adapter's switches, or from real Apple monitors, in particular the Portrait Display. However, a funny effect was observed... I tried to do the same with no monitor at the built-in port, pressing Cmd-Shift-3 blindly and then Keyboard power-en
  22. Still quite busy... but here's a bit of news about the subject -- not as good as I'd like, though I made a crude, ugly connector for this card, but so far I connected the several SENSE and SYNC lines plus the associated grounds only. No coaxial cables were soldered thus no picture would be possible; but at least I could check if my versatile Acer monitor syncs up properly with the card's (partial) output. Some evidence of this outrage: Now, the testing: I used a IIsi with 33 MB and System 7.5.5. An Apple 12" RGB was connected to the internal video output (to be able to see what was go
  23. Some updates on my previous post... Those HP BD07285A25 drives are indeed great -- head seeks are extremely quiet and quick, draw a moderate amount of power (0.8A @ 12V, although a hefty 1.2A @ 5V) and, if properly formatted, they'll work fine even on '030 machines. But I have to correct about them running reasonably cool... they can get very hot, but it'll take quite a long time -- and they'll stay warm even several hours after shutoff. Looks like they have some thermal inertia... Still, I'm afraid that all these SCSI-3 drives, when connected to a "lower" interface via an adapter,
  24. Actually, the stack pointer is taken from $00000000, and the starting address from $00000004... By the way, the starting address for some (most?) Mac ROMs is of the form $40800000 -- that way is both compatible with 32-bit addressing, as expected upon reset ($40x00000 is the start of the several ROM images); and with 24-bit addressing, which maps the ROM to $800000. BTW2... the SE and others (but not the SE/30) do not use any VIA bit for toggling the ROM overlay mode -- the first access to the ROM within its usual address range switches it!
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