Dma Controller - Epson SCE8720C Series Hardware Manual

1.6 DMA controller

SCE8720C is provided with 2 DMA controllers (82C37A equivalent) used as follows. With
SCE8720C, DMA is not available from users, as the ISA bus only has limited functions.
Table 1.2 DME controller 1
Channel No.
CH0
CH1
CH2
CH3
Table 1.3 DME controller 2
Channel No.
CH4
CH5
CH6
CH7
Controller 1, including CH0 to CH3, is used for 8-bit data transfer. Up to 64KB block
transfer is possible between 8-bit I/O and 8-bit memory or 16-bit memory.
Controller 2, including CH4 to CH7, is mainly used for 16-bit data transfer, and among
them CH4 is used for cascade connection of controller 1. CH5 to CH7 are not used.
Controller 2, including CH4 to CH7, is mainly used for 16-bit data transfer, and among
them CH4 is used for cascade connection of controller 1. CH5 to CH7 are not used.
Table 1.4 DMA page register
Page register
DMA channel 0
DMA channel 1
DMA channel 2
DMA channel 3
DMA channel 5
DMA channel 6
DMA channel 7
REFRESH
Rev.A
Device
Not available (cannot be used by user)
Not available (cannot be used by user)
Floppy disk
Not available (cannot be used by user)
Device
Cascade connection of controller 1.
Not available (cannot be used by user)
Not available (cannot be used by user)
Not available (cannot be used by user)
I/O address
0087h
0083h
0081h
0082h
008Bh
0089h
008Ah
008Fh
EPSON
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