🚀 go-pugleaf

Hello everybody !
I want to pass from PROTECT MODE of GNU C in the REAL MODE on the
some time,for after that to establish DMA channel on the read of
memory from CAMAC, after that I would like to return in PROTECT
MODE and working further. But I can't make nothing...(?)
How only I try change register CR0 for that throw off PE bit,
such I get message "GENERAL PROTECTION ERROR" and program stopped.
Tell me please, may I do anything here (?) or in the GNU C, not
possibility to change MODE of Work Processor's.
 
Yet once question:
I nowhere not find the information about chip TRIDENT TVGA (9000).
Me need description of I/O Ports for extension VGA (TVGA), and
how can to manage of Video RAM to limits 1Mb.
If anybody know it information, send me please or tell address FTP
where it information lay.


E-mail: vasiliev_i@m10.ihep.su

Thank You All Very Much Beforehand - Igor Vasiliev