At 15:30 -0500 03/26/2003, Vintage Macs wrote: >Date: Wed, 26 Mar 2003 08:18:07 -0500 >From: the pickle <[EMAIL PROTECTED]>
>If the ROM was simply coded to ignore the extra RAM, the patching is trivial. Hmmm. I wonder if there's any way to squeeze the IIsi ROM in there and see what happens... >If the RAM controller itself won't recognise more than that, you're right - >it's basically impossible. If we had the documentation on the original ASIC....which, I guess, is another way of saying basically impossible. The FPGAs another poster mentioned give a convenient way to modify these old machines. If we had the original Verilog or VHDL which Apple used to design those ASICs (assuming they used an HDL) it would be fairly trivial to modify the design appropriatley. Then the trick would be to find an FPGA with a compatible pinout. The latter might not be as hard as it sounds, as engineers tend to reuse pinouts all over the place. But the impossible part is probably learning enough about what the original chip does to be able to design a replacement. So, someone sneak on over to Apple and appropriate those files, okay? And while you're there get the Bandit and Hammerhead designs too, would you? It's too bad the patent office stopped requiring full disclosure on patented devices. Jeff Walther -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
