At 21:35 6.5.1998 -0600, you wrote: >From: Bob Newhart > > >>Does anyone know of a serial static RAM I could use for additional PIC >>data memory > >probably not what you want to hear, but I have been able to glue together >74LS164s and 74LS165 to emulate serial devices of whatever size you want. >not at all pretty, and there must be a better solution. > I used PCF8583 (Philips) in one of my projects. This is the inexpensive circuit with date, clock, alarm and 240 bytes of RAM. Chip use I2C bus, so you will need couple of free bytes in PIC for I2C implementation. You can use up to 2 chips on one bus, so you can have up to 480 bytes of RAM. Clock and/or event counter is a free bonus. Price of the chip should be somewhere around 3 - 4 dollars. I used these chips with MAX690 watchdog, so you can have battery backup SRAM with this chip and one lithium button. Best regards PavelK ************************************************************************** * Pavel Korensky * * DATOR3 LAN Services spol. s r.o. * * Modranska 1895/17, 143 00, Prague 4, Czech Republic * * * * PGP Key fingerprint: F3 E1 AE BC 34 18 CB A6 CC D0 DA 9E 79 03 41 D4 * * * * SUMMA SCIENTIA - NIHIL SCIRE * **************************************************************************