DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
54
I/O Ad-
dress
Read/Write
Status
Description
0064h R Keyboard controller read status
bit 7 = 0 No parity error
1 Parity error on keyboard transmission
bit 6 = 0 No timeout
1 Received timeout
bit 5 = 0 No timeout
1 Keyboard transmission timeout
bit 4 = 0 Keyboard inhibited
1 Keyboard not inhibited
bit 3 = 0 Data
1 Command
bit 2 = System flag status
bit 1 = 0 Input buffer empty
1 Input buffer full
bit 0 = 0 Output buffer empty
1 Output buffer full
0064h W Keyboard controller input buffer
0070h R CMOS RAM index register port and NMI mask
bit 7 = 1 NMI disabled
bits 6-0 = 0 CMOS RAM index
0071h R / W CMOS RAM data register port
0080h R / W Temporary storage for additional page register
0080h R Manufacturing diagnostic port
(this port can access POST
checkpoints)
0081h R / W DMA channel 2 address byte 2
0082h R / W DMA channel 2 address byte 2
0083h R / W DMA channel 1 address byte 2
0084h R / W Extra DMA page register
0085h R / W Extra DMA page register
0086h R / W Extra DMA page register
0087h R / W DMA channel 0 address byte 2
0088h R / W Extra DMA page register
0089h R / W DMA channel 6 address byte 2
008Ah R / W DMA channel 7 address byte 2
008Bh R / W DMA channel 5 address byte 2
008Ch R / W Extra DMA page register
008Dh R / W Extra DMA page register
008Eh R / W Extra DMA page register
008Fh R / W DMA refresh page register
Continued...
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