SwissMicros DM42 - Graphics and Input Modes; Alpha Input Mode

whenever the calculator is turned OFF and FAT disk doesn’t contain any valid custom image or the
FAT disk is in error state.
Custom OFF images should be stored in /OFFIMG/ directory. All valid images are then cyclically
displayed one after each calculator OFF in the order how they appear in /OFFIMG/ directory.
OFF images require specific image format. It has to be .bmp file with dimensions 400 x 240 and 1 bit
depth.
Examples of OFF images can be found on "A collection of off-screen images" page.
PIXEL and AGRAPH
PIXEL and AGRAPH are not limited to the original HP-42S’s resolution of 131x16 pixels. The
compatibility with negative values to display lines and with complex numbers and matrices is
conserved. You can now use horizontal values of 1≤X≤200 and vertical values of 1≤Y≤120 in
200x120 mode, or 1≤X≤400 and 1≤Y≤240 in 400x240 mode. Switching between 131x16, 200x120 and
400x240 modes is achieved using the GrMod virtual variable and current graphics resolution could
be probed by ResX and ResY.
Alpha Input Mode
Upon entering Alpha input mode you will see a new annunciator on the screen:
• "[ ]" denotes original HP-42S input mode. This is the mode that Alpha input starts with when
entered for the first time.
• "[a]" denotes lower case DM42 input mode.
• "[A]" denotes upper case DM42 input mode.
[ SHIFT ] followed by [ ▲ ] and [ ▼ ] allow you to cycle through the modes.
The DM42 remembers which mode you were in last time alpha input was active and upon entering
alpha input modes switches immediately to that mode.
Original HP-42S mode
• Function keys work as expected for standard characters.
• ASTO (STO) and ARCL (RCL) work as expected.
• "%", "pi" and "E" work as expected.
• [ SHIFT ] [ SHOW ] works as expected.
• Local labels LBL 01, LBL A and LBL a work as expected.
• Global labels LBL "ABC", LBL "123" and LBL "A123" work as expected.
• Un-shifted [R/S] works as expected and [SHIFT] [R/S] enters/leaves Prgm mode as expected.
Lower and upper case DM42 modes
• The function keys still allow input in HP-42S mode.
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