Duo 2300c/180 MHz 603e QFP Graft/Hack . . .

[Bunsen]

IIRC, that PDS extender only works on the downstream side of the G3 upgrade, ie between the G3 and a PDS video card - and only a video card. I don't think anything but a video card even works plugged straight into the PDS passthru on the G3, so it's likely the ribbon only has enough lines for that and nothing else.

But wait ... you're hoping to run a desktop G3 upgrade card in a Duo?

 

[Trash80toHP_Mini]

Nope, still looking at ways to adapt a CrescendoPB to the Modem Cubic, this was just a down and dirty test of the cable.

BTW, if a CrescendoPB works, ANY 1400 ProcCard ought to work! :b&w:

 

[Bunsen]

this was just a down and dirty test of the cable.

...why? Surely you're going to need a completely different cable for the actual hack?

BTW, if a CrescendoPB works, ANY 1400 ProcCard ought to work! :b&w:

Which gives you the option of using vanilla 1400 CPU cards as disposable testbeds

 

[Trash80toHP_Mini]

Which gives you the option of using vanilla 1400 CPU cards as disposable testbeds . . .

. . . and allows other DuoHackers to find far less expensive/READILY AVAILABLE, cache-on-board 603ev ProcCards from the 1400 series to speedbump their 2300s . . .

. . . instead of the CrescendoPB! }

I'm not yet convinced that Sonnet's cable won't work, it looks like a straight passthru cable to me (that fits!) with some intervening circuitry that likely allows 2 PDS cards to be addressed in one PDS Slot.

It's probably very similar to that super-expensive SE/30 multicard adapter with the mysterious PAL on board. Disable that kinda nonsense and I'll bet the Sonnet Card will run just fine on the end of its matching cable!

If this doesn't work out, I'll just have to do ONE adapter card that's a lot more complex a task than doing two simpler cards for the ends of the existing/available Sonnet cable . . .

 

[Bunsen]

BTW, if a CrescendoPB works, ANY 1400 ProcCard ought to work! :b&w:

Did I mention that at least some (if not all) of the Apple 166MHz 1400 cards are actually 180MHz 603s downclocked? At least according to the HHHH.

every 166 MHz CPU module I have examined actually uses a 180 MHz 603ev part!

 

[Bunsen]

I'll bet the Sonnet Card will run just fine on the end of its matching cable!

Ahhhh now I understand - you want to go socket->cable->G3->HPV, instead of socket->G3->cable->HPV, so you can move the G3->HPV elsewhere in the case. Well, seeing as both the HPV and the G3 can sit in the 601 PDS socket, sure, why not?

it looks like a straight passthru cable to me with some intervening circuitry that likely allows 2 PDS cards to be addressed / Disable that kinda nonsense

You may not have to. If I remember my PDS lore, the cards themselves (at least 030 PDS ones) carry pseudo-slot IDs - the relative position on a multi-card chain matters not.

 

[Trash80toHP_Mini]

Did I mention that at least some (if not all) of the Apple 166MHz 1400 cards are actually 180MHz 603s downclocked?

Only one fly in that ointment, they're all BGA CPUs on those cards. However, if I can get 1400 cards and T-Rex to work within the Duo's case, I might be tempted to try overclocking it!

I think my precious QFP 603e is going to go into my best (read: Beater Quality Plastics) 5300ce. There's already some overclocking info from TomLee available and that beautiful 800x600x16bit Spanned Display tips the scales in that direction . . .

. . . not to mention the T-Rex/Card Cage already on board! }

EDIT: forgot to mention the 5300ce 64MB (artificial) RAM limit > the 2300c 48MB (waaaayyyyyyyy artificial) RAM ceiling.