Tabel 2. I/O-adresser (fortsat)
Adresse (hex-
værdi)
Størrelse (byte)
Beskrivelse
03F0 – 03F5
6
Diskette channel 1
03F6
1
Primary IDE channel command port
03F7 (Write)
1
Diskette channel 1 command
03F7, bit 7
1 bit
Diskette disk change channel
03F7, bits 6:0
7 bits
Primary IDE channel status port
03F8 – 03FF
8
COM1
0400 – 047F
128
Available
0480 – 048F
16
DMA channel high page registers
0490 – 0CF7
1912
Available
0CF8 – 0CFB
4
PCI configuration address register
0CFC – 0CFF
4
PCI configuration data register
LPTn + 400h
8
ECP port, LPTn base a hex 400
OCF9
1
Turbo and reset control register
0D00 – FFFF
62207
Available
DMA I/O-adresser
Tabellen nedenfor viser, hvilke ressourcer der er tilknyttet DMA-adresserne. Adres-
ser, der ikke er vist, er reserveret.
Tabel 3. DMA I/O-adresser
Adresse
(hex-værdi)
Beskrivelse
Bit
Byte-
pointer
0000
Channel 0, memory address register
00 – 15
Ja
0001
Channel 0, transfer count register
00 – 15
Ja
0002
Channel 1, memory address register
00 – 15
Ja
0003
Channel 1, transfer count register
00 – 15
Ja
0004
Channel 2, memory address register
00 – 15
Ja
0005
Channel 2, transfer count register
00 – 15
Ja
0006
Channel 3, memory address register
00 – 15
Ja
0007
Channel 3, transfer count register
00 – 15
Ja
0008
Channels 0–3, read status/write command register
00 – 07
0009
Channels 0–3, write request register
00 – 02
000A
Channels 0–3, write single mas register bits
00 – 02
000B
Channels 0–3, mode register (write)
00 – 07
000C
Channels 0–3, clear byte pointer (write)
A
000D
Channels 0–3, master clear (write)/temp (read)
00 – 07
000E
Channels 0-3, clear mask register (write)
00 – 03
000F
Channels 0-3, write all mask register bits
00 – 03
0081
Channel 2, page table address register
00 – 07
0082
Channel 3, page table address register
00 – 07
Tillæg D. Oversigt over systemadresser
79
Summary of Contents for NetVista A40i 2251
Page 2: ......
Page 6: ...Tillæg F Bemærkninger og varemærker 83 Varemærker 83 Stikordsregister 85 iv Brugervejledning ...
Page 44: ...34 Brugervejledning ...
Page 94: ...84 Brugervejledning ...
Page 97: ......