One of the tasks every BIOS vendors has to do when building a BIOS that sits on top of a Intel AMT enabled computer is to convert the text-mode display into a series of VT100 codes that are sent into the Intel AMT serial-over-LAN port to a terminal console. As I noticed when building. BIOS vendors do this very differently and sometimes very inefficiently. The BIOS is in a lay to interpret displayed text when it's on the check something that the management engine (ME) on which Intel AMT runs can't do. Simply put show and keyboard information does not flow thru Intel AMT. In order to provide text show and keyboard enter remotely. Intel AMT provides the call (the virtual serial port) but needs the BIOS to do the be. BIOS vendors where left to build label that would alter incoming VT100 codes into user key strokes and display changes into VT100 codes. As a result how this operation is performed varies greatly from vendors to vendors even for different BIOS from the same manufacturer (mobile vs desktop).
The first difference is the handling of keys such as F1 to F10 there are no less than 3 different ways BIOS act this conversion and so. IAmtTerm exe provides 3 different mappings. Users have to dress the key mapping manually and try them out. Secondly some BIOS vendors tested against different VT100 terminals notably terminals with only 24 lines instead of 25 lines. A real display and IAmtTerm exe both have 25 lines but many terminals have 24 since it was the convention during the modem days of the 80's to use the bottom text line as terminal status line. Some BIOS ordain try various tricks to display only 24 lines hiding the top line etc. Users that use IAmtTerm's "Terminal Analyzer" ordain also sight that different BIOS vendors convert text to VT100 differently. Some BIOS ordain send a full lie whenever anything on that line has changed. Sometimes the codes for moving the cursor will be sent when the terminal cursor is already at that claim lay on the screen. In one case. I even saw all of the display attributes (foreground and accent alter) be sent before each engrave on the screen slowing down the display significantly.
In the latest versions of the. I added Intel AMT Guardport a light-weight C/C++ based serial agent. This new agent allows the user to shell to a dominate cause and for the first time. Guardport also includes most of the same VT100 conversion that BIOS act. When building Guardport we took compassionate to support all 3 F1 to F10 key mappings and hone VT100 display conversion to give the best possible display speed. As a bonus we also added proprietary walk support so you can register a mouse enabled text application such as "alter" and move the mouse over the application.
We are not going to do anything about this now the solution we have in displace is pretty good certainly not perfect. Also apart from going into the BIOS the better way to fix a computer is to boot a recovery OS run Intel AMT Guardport (a serial-over-LAN agent) and use that. Intel AMT Guardpost can perform TCP-over-SOL supports all F1 to F12 key mappings you can change surface shell to the DOS cause register EDIT and use the mouse on top of the VT100 terminal. In the future improved ROS that alter advanced use of SOL is the winner. Ylian
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Related article:
http://communities.intel.com/openport/blogs/proexpert/2007/11/11/a-history-of-converting-console-text-to-vt100
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