Lenovo NetVista A22 User guide for NetVista 2254, 2256, 2257, 6336, 6337, 6339 - Page 77

Table 2. I/O address map (continued) Address range (hex) Size (bytes) 03F7, bit 7 1 bit 03F7, bits 6:0 7 bits 03F8 - 03FF 8 0400 - 047F 128 0480 - 048F 16 0490 - 0CF7 1912 0CF8 - 0CFB 4 0CFC - 0CFF 4 LPTn + 400h 8 OCF9 1 0D00 - FFFF 62207 Description Diskette disk change channel Primary IDE channel status port COM1 Available DMA channel high page registers Available PCI configuration address register PCI configuration data register ECP port, LPTn base address + hex 400 Turbo and reset control register Available DMA I/O address map The following table lists resource assignments for the DMA address map. Any addresses that are not shown are reserved. Table 3. DMA I/O address map Address (hex) Description 0000 Channel 0, memory address register 0001 Channel 0, transfer count register 0002 Channel 1, memory address register 0003 Channel 1, transfer count register 0004 Channel 2, memory address register 0005 Channel 2, transfer count register 0006 Channel 3, memory address register 0007 Channel 3, transfer count register 0008 Channels 0-3, read status/write command register 0009 Channels 0-3, write request register 000A Channels 0-3, write single mas register bits 000B Channels 0-3, mode register (write) 000C Channels 0-3, clear byte pointer (write) 000D Channels 0-3, master clear (write)/temp (read) 000E Channels 0-3, clear mask register (write) 000F Channels 0-3, write all mask register bits 0081 Channel 2, page table address register 0082 Channel 3, page table address register 0083 Channel 1, page table address register 0087 Channel 0, page table address register 0089 Channel 6, page table address register 008A Channel 7, page table address register Bits 00 - 15 00 - 15 00 - 15 00 - 15 00 - 15 00 - 15 00 - 15 00 - 15 00 - 07 00 - 02 00 - 02 00 - 07 N/A 00 - 07 00 - 03 00 - 03 00 - 07 00 - 07 00 - 07 00 - 07 00 - 07 00 - 07 Byte pointer Yes Yes Yes Yes Yes Yes Yes Yes Appendix C. System address maps 65