• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

Recent content by Melkhior

  1. M

    macintosh IIsi 4MB onboard RAM upgrade

    The speed of chips will not change the performance of the memory subsystem. The IIsi uses synchronous cycle, the timings are based on the CPU clock, not the speed on the chips. The number of cycles required is hardwired in the memory controller (or could be configurable via a hardware register...
  2. M

    SEthernet and SEthernet/30: A new take on PDS Ethernet

    OK, thank you! So I have the 'right' one, provided the 20 MHz clock of the IIsi doesn't cause issue. IIRC, you tested in a IIfx as well? That should also default to a 20 MHz clock, so odds are good, if I didn't mess up something else. I did manage to run WinCUPL under Wine (GUI doesn't look...
  3. M

    SEthernet and SEthernet/30: A new take on PDS Ethernet

    Dumb question - what's the speed grade of the ATF1502AS on those board? That's the one number I didn't double-check before ordering my variant, and now I'm worried I made a stupid assumption. The schematics mentions a -25 [AU44], but that could just be the for the schematics/footprint, where the...
  4. M

    Adding 8 slots to my Compact Mac

    Thank you, that explain a bit. Memory map limits 60000 PDS (SE slot) to one and NuBus slots to 6, while available interrupts on the connector limits the SE/30 and IIsi expansion to 3 slots. So 4 (or even more so 8) slots feels a bit weird. Not impossible in theory, but that would require a lot...
  5. M

    128 pin PGA sockets for 68030s that don't suck?

    Paid €3.27 for 300 (allegedly, didn't count them...) on AliExpress. But yes, preci-dip is likely a better/easier option for 'standard' sockets - IMHO the interest lie more in things like the 'V' version of the 68040 in PGA package, whose socket is not listed in preci-dip's list of pin patterns.
  6. M

    128 pin PGA sockets for 68030s that don't suck?

    You could always make your own :-) Also, Preci-Dip 510-87-128-13-041101 is in stock at Mouser (France) and much less expensive than the Mill-Max. I haven't tried one, but the 510-83-068-10-061101 was fine for the '881/'882 in my PDS adapter.
  7. M

    Building PCB in Europe is soooo expensive...

    Yes, and it's quite frustrating. This particular manufacturer in Germany (aisler.net) used to have a service where they shipped parts along the PCB, but not assembled; for through-hole, it was convenient to avoids shipping costs on €2 worth of components. I did my MAC/VGA adapter and the custom...
  8. M

    Building PCB in Europe is soooo expensive...

    A simple PDS adapter with 2 slots for the IIci, so just 8 lines in the BoM for SMT (two for resistors, four for capacitors, small switch & a single 1G3157 IC switch). JLCPCB breakdown for 5 boards: Merchandise Total $48.87 Shipping $20.22 Customs duties & taxes $13.82 Grand Total: $82.91...
  9. M

    IIci etc. ATX to 10pin Adapter

    Those are the correct files, but the pick'n'place file only has the surface mounted components. The two plugs for power (J1, J2) and the switch (U1) I got separately and soldered by hand (they are listed in the BoM) - they hare through-holes. J2 is on the bottom side and by default JLCPCB only...
  10. M

    SEthernet and SEthernet/30: A new take on PDS Ethernet

    Turns out, space is really constrained - that 5V plug wouldn't fit, and I'm not sure an ethernet would would on the other side... so as not much power is needed, go for a micro-usb instead of the bulky plug, and rotate the Ethernet 90° so the cable has space inside the machine. @halkyardo Are...
  11. M

    IIsi NuBus adapter being weird but only with one specific video card

    I wouldn't expect a video device to need 12V, very surprised it did for such a critical function... so it works now in the IIsi?
  12. M

    IIsi NuBus adapter being weird but only with one specific video card

    The IIsi power supply and internal circuitry isn't great, so my suggestion it to check the voltage on the 5V rail in all three cases (no video and both video device). I would expect the Mac to go into self-reset rather than just hang, but it's an easy check so worth doing. Ideally you want at...
  13. M

    Supported PowerMac 6100 L2 sizes?

    I don't think the chips can do more than 1 MiB out-of-the-box as they don't have the necessary inputs. It might be possible to add external logic to support larger sizes, but then timings would become a major issue. 1MiB might be feasible, but I don't know of a reference design, and assembling...
  14. M

    LC III & LC 520/550 PDS slot compatibility

    Yes, the devnote for the 520 says it's the same. Page 30:
  15. M

    Supported PowerMac 6100 L2 sizes?

    After I posted that, I found some AliExpress vendor claiming they were selling the 66 MHz version for about $17 each. Between the unreliability of such claims, and the fact it would require being shipped to e.g. JLCPCB somehow for assembly (or be handled by someone able to solder BGA at 'home')...
Top