Write any word to this address (or use OS_UpdateMEMC)
%00000011011x111xxx0-----------xx
|||\|\|\||/
OS mode -----------'|| | | |`-- Page Size
0 On || | | | 00 4Kb
1 Off || | | | 01 8Kb
|| | | | 10 16Kb
Sound DMA control --'| | | | 11 32Kb
0 Disable | | | |
1 Enable | | | `--- Low ROM Access
| | | 00 450ns
Video/Cursor DMA ----' | | 01 325ns
0 Disable | | 10 200ns
1 Enable | |
| `----- High ROM Access
DRAM refresh control --' 00 450ns
00 None 01 325ns
01 During video flyback 10 200ns
10 None
11 Continous
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