5 - 0x00-0x07: Slot Device Type (R/O)
7 - 0x08-0x0A: System Settings
8 (- 0x08: (R/O) INT state)
9 (- 0x09: (R/W) Clock speed)
10 (- 0x0A: (W/O) Reset, Power-Off)
11 (- ...4 more (RTC?, Timer?))
12 - 0x0F: (R/W) CP/M 24K ROMDISK
14 - 0x10-0x17: Serial Port
16 - 0x11: (R/O) Rx Buffer Fill
17 - 0x12: (R/O) Rx Buffer Size
18 - 0x13: (R/O) Tx Buffer Fill
19 - 0x14: (R/O) Tx Buffer Size
20 (- 0x15: (R/W) Settings (9600n8, INT active))
21 (- 0x16: (R/W) Tx/Rx IRQ Threshold)
24 (- 0x18-0x1F: ??? Timer?)