FAQ: ZX extensions

Hello, Valerij!
14 Jun 98 Valerij Kozhevnikov was mumbling in the hope that Everyone would read about FAQ:
ZX extensions, I read it and decided to answer:

VK> If I messed something up or forgot, please correct or
VK> add.
Correct and add:

VK> COMport on KR580VV51
VK> **
VK> #???? (I don’t remember)
#80f7 #81f7 #82f7 #83f7 - Timer ports
#90f7 #91f7 - COM1 interface ports

VK> ============== Video ===================
VK>
VK> Screen #EFF7 bits (0/1)
VK> **
VK> (bit 1) 256x192 / 512x192
VK> (bit 4) interlacing off/on
VK> #7FFD (bit 3) 5/7 bank
VK>
VK> #EFF7
VK> (bit 2)
VK> ??? (bit 3)
VK> (bit 5)
Ha Profi: #dffd bit 7 256x192 / 512x240
VK> ============== CMOS ====================
VK> (* general description)
VK>
VK> Glukъ #??F7 LD A,regnum ; (0...#3F)
VK> **
VK> OUT (#F7),A
VK> IN A,(#F7)
VK> Profi #00DF
^^^^^ data port
#00ff address port
VK> ROM emulator 64k
VK> **
VK> #00F7
What is this?

VK> HDD (Profi)
VK> #xxCF (???)
wrong ^^^^^ #00cb #00ab #008b

VK> Profi:
VK> #DFFD bit 5 (?) off/on
And there’s more of this in Profi no.

VK> ============= TRDOS ======
VK> Turbo VG (* diagram)
VK>
VK> Direct access to VG:
VK> Scorpion #1FFD bit 2 off/on (GMX)
VK> **
VK> Profi #DFFD bit ? off/on
5 at #7ffd bit4=0

Sincerely, Andrey.

... The hedgehog is a proud bird: if you kick it, it won’t fly!