In the time of day clock in the 6526 do the hours go from 0 to 11 or from 1 to 12 ?

00:00:00 to 11:59:59 or

01:00:00 to 12:59:59


Rob

I found this data sheet for the chip.

http://www.surffi.net/~allu/shared/file ... ia6526.pdf

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Andrew Jacobs
6502 & PIC Stuff - http://www.obelisk.me.uk/
Cross-Platform 6502/65C02/65816 Macro Assembler - http://www.obelisk.me.uk/dev65/
Open Source Projects - https://github.com/andrew-jacobs

Rob,

As I recall, it will run from 01:00:00 to 12:59:59. However, the AM/PM flag is the high bit of the hour register. I don't recall all the specifics.

I did write TOD print and TOD set commands for my SBC-1. If you go to the Downloads section of my website and download the sbcmonitor.zip file, there is a file included called 6526.asm that contains the assembly code.

http://65c02.tripod.com/

Hope this helps.

Daryl