Changes

*For UniDOS, the goal is to store the configuration of UniDOS in a single place even if you have many storage devices connected to your CPC. Since the card also provides a realtime clock, UniDOS will be able to set the correct file dates in the filesystem.

*For development tools: here the idea is precisely to NOT be [[Standard Memory Expansions|dktronic's compatible]]. You can load some code into the RAM and have it available without interference on the CPC state. Very useful if you want to debug some other code.

== Ports ==

*R = READ bit (Setting the READ bit to a '1' halts updates to the registers)

*W = WRITE bit (Setting the WRITE bit to a '1' halts updates to the registers. The user can then load them with the correct day, date, and time data in 24-hour BCD format. Resetting the WRITE bit to a '0' then transfers the values of all registers to the actual counters and allows normal operation to resume)

== Software ==

And it can be accessed directly from BASIC. No RSX required.

== Links ==

[[Media:M48t35.pdf|Datasheet of the M48T35 TimeKeeper SRAM chip]]

[[Category:Peripherals]]

[[Category:Hardware]]

[[Category:Memory expansions]]