| MSB900/L Detailed Technical Manual V1.0 | ||||
I/O Map | Continued… |
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I/O Addr. | Function | Size | R/W | Comment | |
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3F1h | Floppy Status R B | 8bit | RO | First Floppy. | |
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3F2h | Floppy Digital Out | 8bit | Shw@ | First Floppy. | |
3F3h | No Specific Usage | 8bit |
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3F4h | Floppy Cntrl Status | 8bit | RO | First Floppy. | |
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3F5h | Floppy Data | 8bit | Yes | First Floppy. | |
3F6h | No Specific Usage | 8bit |
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3F7h | Floppy Conf Reg | 8bit | Shw$ | First Floppy. | |
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| MSR bit enables/disables into I/O | |
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| 3FFh space. (UART1 MSR | |
UART/IR - COM1 | 8bit | 51400014h[18:16], UART2 MSR | |||
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| 51400014h[22:20]). Defaults to | |
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| LPC. | |
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480h | No Specific Usage | 8bit | WO | Write LPC and DMA. Read only DMA. | |
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481h | DMA Channel 2 High Page | 8bit | Rec | Upper addr bits [31:24]. Write LPC and DMA. | |
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| Read only DMA. | |
482h | DMA Channel 3 High Page |
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483h | DMA Channel 1 High Page |
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No Specific Usage | 8bit | WO | Write LPC and DMA. Read only DMA. | ||
487h | DMA Channel 0 High Page | 8bit | Rec | Upper addr bits [31:24]. Write LPC and DMA. | |
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| Read only DMA. | |
489h | DMA Channel 6 High Page | 8bit | Rec | Upper addr bits [31:24]. Write LPC and DMA. | |
Read only DMA. | |||||
48Ah | DMA Channel 7 High Page |
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48Bh | DMA Channel 5 High Page |
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No Specific Usage | 8bit | WO | Write LPC and DMA. Read only DMA. | ||
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48Fh | DMA Channel 4 High Page | 8bit | Rec | Upper addr bits [31:24]. Write LPC and DMA. | |
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| Read only DMA. | |
No Specific Usage |
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4D0h | PIC Level/Edge | 8bit | Yes | ||
4D1h | PIC Level/Edge | 8bit | Yes | ||
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No Specific Usage |
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Note 1: The Diverse Device Snoops writes to this port and maintains the MSB as NMI enabled. When low, NMI is enabled. When high, NMI is disabled. This bit defaults high. Reads of this port return bits [6:0] from the
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