1225: Difference between revisions

1225 (view source)

105 bytes added , 2 November 2018

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 ==Internals==
-The 1225 is built around a 65C02 as the control processor with 56K of SRAM, and firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad. It is powered by a same 65C02 CPU. There are two coin cell batteries that retain settings. The problem is that there is a bug that prevents it from keeping the date after the year 2000. Upon powering it on and off again it will reverts to 19XX.
+The 1225 is built around a 65C02 as the control processor with 104K of SRAM, and 128K of firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad. It is powered by a same 65C02 CPU, it is using a MC68A45 CRT driver as a display driver. The display has 56K of RAM and 8K of ROM. There are two coin cell batteries that retain settings. The problem is that there is a bug that prevents it from keeping the date after the year 2000. Upon powering it on and off again it will reverts to 19XX.
 Example: 2018 -> 1918