At 18:26 -0700 08/13/2002, Bolton Peck wrote: >Here's all the numbers from the flash ROM, or at least I think >that's what it is. >I have a socket that would fit it (it is, of course, soldered SMT to >the board) so >could theoretically change it. > >M28F256 > -15C1 >V58MA9722A >HONG KONG > >I presume this means its a 256K rom? And would that be bits or bytes?
Bits. Memory chips' capacities are specified in bits. I'm not sure which manufacturer M indicates. I think Macronix is MX. Maybe M is Mitsubishi. Oh, I bet it's ST Micro. The 28 is usually for an EEPROM, though sometimes it's Flash. 29 is used for Flash memory as well as 49. 27 for EPROMs (often have a little window in teh top for UV erasing). ROMs seem to use X3 where I've seen X as 5 or 2. The F usually goes with 5V parts. The 256 means 256 Kbits. So about 32 KB. You'd have to get a data sheet to figure whether its X8 or X16 (inputs and outputs 8 or 16 bits at a time) though you can often tell by the number of pins. >Thats all the info I have on hand, unfortunately Matrox isn't exactly going to >tell you how to get out of paying twice as much for what is essentially an >identical card with a nickel more ROM chip on it. On Ebay under Business and Industrial/Electronic Components/ICs you can often find Flash and EEPROM chips at pretty good prices. I've been checking every so often and stocking sizes that might be handy. I'm still waiting for a nice deal on 8 Mb 3.3V Flash in a 44 pin SOIC... Anyway, if the only difference is the capacity of the Flash, you may just be able to get the M or AT or MX or AM28F512 in the same package and install it and then flash it. However, switching manufacturer may mean that you've switched some of the finer details of the internal workigns of the chip, so it may not work. Jeff Walther -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.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/supermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
