On 02/11/2012 07:33 AM, Jim Brain wrote: > Anyone see issues with wiring up a I2C-based (DS1307-type) RTC to the > cassette port with SCK on WRITE and SDA (data) on sense? Looking at > schematics, READ is often hooked to CA1 or similar read-only pin, but > SENSE appears to be on a GPIO on all CBM machines I found. Obviously, > the RTC would not work if the buttons were pushed on the player, but are > there other concerns? In case you built that setup, it would be worth thinking about including a space/socket for a 24Cxxx I2C-EEPROM. They are small (8pin DIP or 8pin SMD) but give you up to 256KByte (24C2048) memory. They only need +5V and GND besides the I2C connection so the only additional cost for quite a bit nonvolatile storage would be the PCB space. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2012-02-11 18:00:10
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