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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 [2017/07/24 23:44]
jcoffman [Release 3.0-46 alpha (24-Jul-2017)]
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 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. Coments would be welcome.
  
-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.+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 & keyboardthat do output on the Serial line. 
  
 ===== 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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