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software:firmwareos:una:start [2017/07/24 23:42]
jcoffman old revision restored (2017/07/24 23:36)
software:firmwareos:una:start [2018/07/07 10:21]
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. 
 + 
 +This release __should not be installed__ until a new VGA3 board has been checked out with the test codes (video & keyboard) that do output on the Serial line.
  
-VGA scrolling is accomplished using 2 sets of screen registers in the HD6445 chip. Some snow will be observed during large screen updating (DIR listing, e.g.) since there is no way sense the horizontal retrace interval to solve the problem. 
  
 ===== Release 2.1-45 (14-Jan-2017) ===== ===== Release 2.1-45 (14-Jan-2017) =====
software/firmwareos/una/start.txt · Last modified: 2018/07/07 10:21 by b1ackmai1er
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