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A big hello to you, Kirill Frolov! 06:19 of 28 Dec Kirill Frolov wrote in a message to All: KF> Can anyone write to me and see if it is possible to connect in the subject KF> memory page not only for #C000, but for example for #4000 KF> or to another place? Is it possible to connect to address #0000 KF> only 0 page ? In the subject you can also connect pages to the address #8000. There is port #78FD for this : D0 - Analogous to D0 port #7FFD, but for the page at addresses #8000 - #BFFF. D1 - Analogue of D1 port #7FFD, also for the page at these addresses. D2 - Analogue of D2 port #7FFD, in short, here are all the bits below for this window. D3 - Analogue of D4 port #1FFD. D4 - Analogue of D0 port #DFFD. D5 - Analogue of D1 port #DFFD. D6 - Analogue of D2 port #DFFD. D7 - Not used. Thus, port #78FD is a synthesis of 3 ports, controlling the page by address #8000 - #BFFF. KF> If all of the above is possible, then how is it done? KF> It is true that setting bit 2 in #1FFD enables ports KF> TR-DOS and disables the rest ? Good bye! Here waz Dmitriy AKA Raven.