i guess with the right amount of intelligence / time /money anything is possible :)
On Mon, May 13, 2013 at 12:47 PM, Jeff Walther <[email protected]> wrote: > > > On Monday, May 13, 2013 7:31:54 AM UTC-5, Derek Morton wrote: >> >> >> True enough... It would seem Robert was able to install the DOS card in >> his Centris and everything worked. >> >> I was lamenting over the inability to use the PPC x100 4MB PDS video card >> in a Quadra PDS slot. Whenever I am working with my Quadras I grumble over >> the lack of PDS expansion cards. I am perpetually tempted to make one (I >> even went out an purchased a large number of the PDS card connectors from a >> parts broker) but I never seem to have the time to get around to more than >> doodling up a circuit or two. Life always seems to take precedence... And >> how much longer before the Quadras start to die? I think the better >> project would be to reverse engineer the PALs/GALs used for glue logic... >> Programmable devices scare the heck out of me! > > > The PPC X100 machines had a 64 bit data bus. The Quedras had a 32 bit > data bus. It would be non-trivial to adapt the X100 PDS video card to > work in a Quadra. My understanding is that the X100 PDS Video card is > just a dumb frame buffer, but that it is very very fast, because it has > excellent bandwidth -- full 64 bit datapath and 32 bit address bus, and > they're not multiplexed (sharing wires) the way they would be if they were > PCI or NuBus. > > f you built a nice Quadra PDS frame buffer card, you could probably > extract the proportional performance out of the Quadras. The last time I > checked the Texas Instruments THS8135 and THS8200 DACs are still available > for less than $10 each. Come up with some video memory, and logic to tie > the Quadra bus to the VRAM, and march the bits out to the DAC, and a > declaration ROM and you could build a pretty nice PDS card for the Quadras. > > BTW, where did you find the compatible Quadra PDS connectors. I have not > looked really hard, but my desultory searches never turned any up. > > Jeff Walther > > -- > -- > ----- > You received this message because you are a member of the Vintage Macs > group. > The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our > netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml > To post to this group, send email to [email protected] > To leave this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/vintage-macs > > Support for older Macs: http://lowendmac.com/services/ > --- > You received this message because you are subscribed to the Google Groups > "Vintage Macs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Charles -- -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/ --- You received this message because you are subscribed to the Google Groups "Vintage Macs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
