The nature of work I do for a living allows me access to a wide variety of electronic components. I also have the ability to burn just about any chip made. I find this topic fascinating and if there really is demand for this I would love to offer my help.
If you could give me a specific module form factor, rom size and maybe a few manufacturer parts numbers off the chips I bet I could come up with something. Nothing is too esoteric, If it was made Im willing to wager I can find it. -----"Compact Macs" <[EMAIL PROTECTED]> wrote: ----- To: "Compact Macs" <[EMAIL PROTECTED]> From: Jeff Walther <[EMAIL PROTECTED]> Sent by: "Compact Macs" <[EMAIL PROTECTED]> Date: 08/02/2004 21:18 Subject: Re: Soft "rom" question >From: "Snook, John R" <[EMAIL PROTECTED]> >Date: Mon, 2 Aug 2004 15:11:51 -0700 > ><Gamba (who seems to have vanished, though his website is still up, ><thank goodness) and I did in fact build a ROM SIMM, copying the ><contents of the IICI ROM to blank chips and installing them on a ROM ><module circuit board. This successfully worked in an SE/30. The ><same could be done with a IISI or IIFX big snip ><The primary thing, though, is that you need access to a chip ><programmer, to get the code onto blank chips, and you need the ><ability to build a circuit board that will plug into the ROM SIMM ><socket, hold the programmed memory chips, and connect everything up ><properly. > ><Jeff Walther >--------------------------------- > Jeff, I was wondering if I could modify a SE/30 ROM to put the chips you > programmed on them? >What do you think? >johnsn Gamba and I considered this route, as it would tremendously simplify things. Building the circuit board was the most challenging part of the project, and simply replacing the chips on an existing SE/30 ROM would sidestep that task. For that matter, one could (presumably) find ROM SIMMs from a Mac II, IIx or IIcx and use those. Many of those machines seem to be meeting their ends. Unfortunately, the chips used on the SE/30 modules don't seem to match any of the blank chips which are available. Gamba has a pretty good pedigree of the ROM modules available on his website and none of them use commonly available chip packages. For example, the most common Flash chip is probably a PLCC32 package. This is the little rectangle with 7 X 9 X 7 X 9 pins on the four sides that sort of wrap down the side edges of the chip. None of the SE/30 ROMs used this kind of chip. IIRC, there's a PLCC44 ROM module and some kind of SOIC32 ROM module. If we could find Flash or EEPROM chips in a PLCC44 or SOIC32 package (again, if I remembered correctly) then it would be doable, but those chip packages are obsolete and no longer available, as far as we could tell. If that's not clear let me know and I'll try to explain better. Jeff Walther -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> 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/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com --------------------------------------------------------------- -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> 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/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
