1220: Difference between revisions

1220 (view source)

Revision as of 06:12, 14 November 2020

1 byte removed , 14 November 2020

→‎Internals

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 ==Internals==
-The 1220 is built around a 65C02 as the control processor with 48K of SRAM, and 64K of firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad, which is powered by another 65C02 CPU and is using an MC68A45 CRT controller to drive the display. The display board has 56K of RAM and 8K of ROM, with two coin cell batteries to retain settings. There is a bug that prevents the 1225 from keeping the date after the year 2000. Upon powering it off and on again it will revert to 19xx, e.g. 2018 will turn into 1918.
+The 1220 is built around a 65C02 as the control processor along with SRAM, and 64K of firmware in a bank of EPROMs. There is a separate board under it that manages the display and keypad, which is powered by another 65C02 CPU and is using an MC68A45 CRT controller to drive the display. The display board has 56K of RAM and 8K of ROM, with two coin cell batteries to retain settings. There is a bug that prevents the 1225 from keeping the date after the year 2000. Upon powering it off and on again it will revert to 19xx, e.g. 2018 will turn into 1918.
 The keypad switches have a tendency to become very "bouncy". See the "repair" tab.
 ===Easter egg===
-An "Easter egg" can be activated in the 1225 by pressing the STOP button when the welcome screen shows during power-up. A bar with the programmers' names will display near the bottom of the screen.
+An "Easter egg" can be activated in the 1220 by pressing the STOP button when the welcome screen shows during power-up. A bar with the programmers' names will display near the bottom of the screen.
 == Links ==