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System Guide Doc Fix

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- See discussion at <https://groups.google.com/g/rc2014-z80/c/TIQv8-q4R2s>
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Wayne Warthen
2025-04-24 17:42:03 -07:00
parent 3450ce71a6
commit 07c08e2817
9 changed files with 11 additions and 4 deletions
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11
Source/Doc/SystemGuide.md
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@@ -2054,12 +2054,16 @@ standard HBIOS result code.
| | E: Keycode |
Read the next key data from keyboard of the specified Video Unit (C). If
a keyboard buffer is used, return the next key code in the buffer. If
a keyboard buffer is used, return the next Keycode in the buffer. If
no key data is available, this function will wait indefinitely for a
keypress. The Status (A) is a standard HBIOS result code.
The Scancode (C) value is the raw scancode from the keyboard for the
keypress. Scancodes are from the PS/2 scancode set 2 standard.
keypress. Scancodes are optional and may not be implemented by the
driver. The Scancode values are driver dependent. In the case of a
PS/2 keyboard driver, they should be the PS/2 scancode. Other keyboard
drivers may return values appropriate for their specific keyboard. If
the driver does not implement this, it should return 0 in C.
The Keystate (D) is a bitmap representing the value of all modifier keys
and shift states as they existed at the time of the keystroke. The
@@ -2076,6 +2080,9 @@ bitmap is defined as:
| 1 | Control key was held down |
| 0 | Shift key was held down |
Not all of these bits may be relevant for all keyboards. Any bit that
is not relevant should be returned as 0.
The Keycode (E) is generally returned as appropriate ASCII values, if
possible. Special keys, like function keys and arrows, are returned as
reserved codes as described at the start of this section.