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Added Console Takeover Mechanism

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- If enabled by AUTOCON config setting, you can press <space> at any character device to take over the console at the boot loader prompt.
- Correction to SIOSEEK documentation in System Guide.  Thanks and credit to Martin R.
This commit is contained in:
Wayne Warthen
2024-02-04 15:08:34 -08:00
parent b633c309f4
commit d93e639e4b
33 changed files with 149 additions and 20 deletions
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7
Source/Doc/SystemGuide.md
View File

@@ -670,11 +670,10 @@ by this function. The function typically just records the sector
address for subsequent I/O function calls.
The double-word Sector Address (DEHL) can represent either a Logical
Block Address (LBA) or a Cylinder/Head/Sector (CHS). If the high bit of
register D is set, then an LBA value is specified. Otherwise, the
value is CHS.
Block Address (LBA) or a Cylinder/Head/Sector (CHS). Bit 7 of D is
set (1) for LBA mode and cleared (0) for CHS mode.
For LBA mode operation, the high bit is cleared and the entire
For LBA mode operation, the high bit is set and the rest of the
double-word is then treated as the logical sector address.
For CHS mode operation, the Sector Address (DEHL) registers are

28
Source/Doc/UserGuide.md
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@@ -897,6 +897,31 @@ The use of diagnostic levels above 4 are really intended only for
software developers. I do not recommend changing this under
normal circumstances.
## Console Takeover
If your system has more than one character unit, then the Boot Loader
will "poll" all of the character devices for a request to make any of
the alternate character devices the active console. This is called a
console takeover request. This functionality must be enabled in the ROM
build configuration, but it is for all standard ROMs.
To request a console takeover, you just press the \<space\> character
at the port or terminal that you want to move the console to. The
terminal or communication software **must** be configured for the
default serial port speed and data bits for this to work.
A takeover request is only possible while the active console is
showing the Boot Loader prompt prior to typing any characters at
the active console. In other words, once you start typing at the
active console prompt, the takeover polling is suspended. If you have
started typing characters, you can press \<enter\> at the active
console to get a new Boot Loader prompt and reactivate the polling.
If you have built a custom ROM that includes an automatic boot
command with a timeout, then performing a console takeover will
abort the timeout process and the automatic command will not be
performed.
## Front Panel
RomWBW supports the concept of a simple front panel. The following
@@ -924,7 +949,8 @@ output on the console. The meaning of the LEDs is:
Once the system has booted, the LEDs are used to indicate disk device
activity. Each LED numbered 7-0 represents disk units 7-0. As each
disk device performs I/O, the LED will light.
disk device performs I/O, the LED will light while the disk is active.
This is only possible for the first 8 disk units.
The second row of the front panel is composed of switches that allow
you to control a few aspects of the system startup.