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software:firmwareos:una:start [2017/07/24 23:44]
jcoffman [Release 3.0-46 alpha (24-Jul-2017)]
software:firmwareos:una:start [2018/07/07 10:21] (current)
b1ackmai1er [Release 3.0-46 alpha (24-Jul-2017)]
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 ===== Release 3.0-46 alpha (24-Jul-2017) ===== ===== Release 3.0-46 alpha (24-Jul-2017) =====
  
-This is a pre-release of the VGA3 support codes. The keyboard emulates a TTY, returning 7-bit ASCII codes normally, and specific 8-bit codes for the extended 104/105 PS/2 keyboard. These extended codes are compatible with RomWBW, but will display as oddball ASCII by CP/M, which masks all input to 7-bits. NumLock, CapsLock, and ScrollLock lights are enabled. The first two operate as expected, and I am considering implementing ScrollLock as an End-of-Line XON/XOFF – which I think IBM may have intended from the outset. ​Coments ​would be welcome.+This is a pre-release of the VGA3 support codes. The keyboard emulates a TTY, returning 7-bit ASCII codes normally, and specific 8-bit codes for the extended 104/105 PS/2 keyboard. These extended codes are compatible with RomWBW, but will display as oddball ASCII by CP/M, which masks all input to 7-bits. NumLock, CapsLock, and ScrollLock lights are enabled. The first two operate as expected, and I am considering implementing ScrollLock as an End-of-Line XON/XOFF – which I think IBM may have intended from the outset. ​Comments ​would be welcome.
  
 VGA scrolling is accomplished using 2 sets of screen registers in the HD6445 chip. VGA scrolling is accomplished using 2 sets of screen registers in the HD6445 chip.
software/firmwareos/una/start.txt · Last modified: 2018/07/07 10:21 by b1ackmai1er
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