Tandy 1400LT - DMA Page Registers; NMI Mask Register Function

DMA PAGE REGISTER
Address Bit Bit data Description
~~
080H Not used
081H
DMA Page Register for DMA channel
2
0 1 /o Address A16
1 1 /o Address A17
2 1/0 Address A 18
3
1 /o Address A19
4-7
X X
082H
DMA Page Register for DMA channel 3
0 1 /o Address A16
1 1/0 Address A17
2 1/0 Address A18
3 1/0 Address A19
4-7
X X
083H
DMA Page Register for DMA channel 1
0 1 /o Address A16
1 1 /o Address A17
2 1/0 Address A18
3 1 /o Address A19
4-7
X
NMI MASK REGISTER
Address Bit Bit data Description
OAOH 7
0 NMI Mask Register
SYSTEM STATUS REGISTER
Refer to 4-13
F-11