Liliana Pubill ha escrito: > I got two Mac Pluses. One had the 4MB upgrade and the other only > showed 1MB. The one that had the 4MB has the beige color and the other > is gray. I assume the gray is a newer model. The beige has the name > "Macintosh Plus 1MB" I've been familiar with for a long time and the > gray has the "Macintosh Plus" plain and simple which I had never seen > before. Anyway I pulled some memory chips from a broken Mac II and > thought I'd put them in the gray Plus. Turned it on showed 2048K RAM. > Thinking that the memory chips I had pulled from the Mac II were only > 512K each, I switched with the RAM installed in the beige Mac Plus. > Beige keeps saying 4096K but the gray stills says 2048K. What is wrong?
The problem is that the Plus have a couple resistors that you have to set up to tell the motherboard what kind of SIMMs you are going to use. As the Plus originally had 1 Mb, it was set to use 256 Kb SIMMs. All you have to do is to set it to use 1 Mb modules (evidently the size of the SIMMs extracted from the Mac II). They were fully recognized by your beige Plus because it was already setted up for 1 Mb modules. As stated in Apple's service manual for the Macintosh Plus, what you have to do to make it fully recognize 1 Mb modules is to find the R8 resistor in the logic board (it is located near the serial port connectors), cut one of its legs and bend it slightly so it doesn't contact anything. After that, your gray Plus should recognize the full 4 Mb. Greetings, Antonio Rodr�guez (Grijan) <ftp://grijan.cjb.net:21000/> -- 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 ---------------------------------------------------------------
