khan@ux1.cso.uiuc.edu (Scott Coleman) (08/14/90)
I have a '386 AT Clone with a malfunctioning real-time clock chip. Specifically, the clock loses time while the power is turned off. I've already replaced the battery which backs up the CMOS (not sure if that battery also backs the clock, but thought I'd try it), to no avail. I'd like to avoid sending my entire computer to the shop for just the clock. My question: Is there a "standard" clock chip used in AT clones (just as the 8250 UART is commonly used for clone serial ports)? If so, how can I identify this chip (i.e. what's the part number, how many pins does it have, etc.) If I can find the chip, and it is socketed, I can just swap the chip out with a new one. If you can help, please email me at the address below. Thanks! -- Scott Coleman University of Illinois khan@ux1.cso.uiuc.edu
grege@gold.GVG.TEK.COM (Greg Ebert) (08/14/90)
In article <1990Aug13.180713.23645@ux1.cso.uiuc.edu> khan@ux1.cso.uiuc.edu (Scott Coleman) writes: >I have a '386 AT Clone with a malfunctioning real-time clock chip. That beast is probably a Motorola 146818 CMOS clock/RAM chip, unless you have a Chips & Technologies 82C206. The only other possibility would be a Dallas module, which you DONT have because you have a battery. You might want to poke-around with a voltmeter to see if the power-down circuitry is working. Also, if your PC is UL approved, there are 2 series diodes which might have poofed. Or your battery voltage is low. I've seen 6.8v and 4.5v batteries.