IBM PC 300GL Type 6272, Technical Information Manual

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Appendix B. System Address Maps
Figure 51 (Page 2 of 2). DMA I/O Addresses
Address (Hex) Description Bits Byte Pointer
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
3 Upper byte of memory address register.
Appendix B. System Address Maps
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