Table 3. DMA I/O address map (continued)

Address (hex)

Description

Bits

Byte pointer

 

 

 

 

008A

Channel 7, page table address register

00 – 07

 

 

 

 

 

008B

Channel 5, page table address register

00 – 07

 

 

 

 

 

008F

Channel 4, page table address/refresh register

00 – 07

 

 

 

 

 

00C0

Channel 4, memory address register

00 – 15

Yes

 

 

 

 

00C2

Channel 4, transfer count register

00 – 15

Yes

 

 

 

 

00C4

Channel 5, memory address register

00 – 15

Yes

 

 

 

 

00C6

Channel 5, transfer count register

00 – 15

Yes

 

 

 

 

00C8

Channel 6, memory address register

00 – 15

Yes

 

 

 

 

00CA

Channel 6, transfer count register

00 – 15

Yes

 

 

 

 

00CC

Channel 7, memory address register

00 – 15

Yes

 

 

 

 

00CE

Channel 7, transfer count register

00 – 15

Yes

 

 

 

 

00D0

Channels 4–7, read status/write command register

00 – 07

 

 

 

 

 

00D2

Channels 4–7, write request register

00 – 02

 

 

 

 

 

00D4

Channels 4–7, write single mask register bit

00 – 02

 

 

 

 

 

00D6

Channels 4–7, mode register (write)

00 – 07

 

 

 

 

 

00D8

Channels 4–7, clear byte pointer (write)

N/A

 

 

 

 

 

00DA

Channels 4–7, master clear (write)/temp (read)

00 – 07

 

 

 

 

 

00DC

Channels 4–7, clear mask register (write)

00 – 03

 

 

 

 

 

00DE

Channels 4–7, write all mask register bits

00 – 03

 

 

 

 

 

00DF

Channels 5–7, 8- or 16-bit mode select

00 – 07

 

 

 

 

 

66User Guide

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Image 78
IBM Partner Pavilion 6795, 6343, 6793, 6349, 6791, 6790, 6792, 6825, 6350, 2292, 6794 Address hex Description Bits Byte pointer