RK06/RK07 Disk Drive User's Manual - Trailing-Edge

Address
( octal) Type
777440 R/W
777442 R/W
777444 R/W
777446 R/W
777450 R/W
777452 R
777454 R
777456 R/W
777460 R/W
777462*
777464 R/W
777466 R/W
777470 R
777472 R
777474 R
777476 R
Table 2-1 RK611 Unibus-Addressable Registers
Register Basic Purpose
Control/Status Register 1 Decode commands/controller
(RKCSI) status
Word Count Register (RKWC) Number of data words for transfer
Bus Address Register (RKBA) Main memory location for data
word
Disk Address Register (RKDA) Desired track/sector address
Control/Status Register Additional control information
(RKCS2)
Drive Status Register (RKDS) Drive status reports
Error Register (RKER) Additional drive status
Attention Summary/Offset Drive status change
Register (RKAS/OF) state/head offset value
Desired Cylinder Register (RKDC) Cylinder address
Unused
Data Buffer Register (RKDB) Data word to /from Silo
Maintenance Register 1 (RKMRl) Drive message select/control
ECC Position Register (RK ECPS) Error position information following
correction sequence.
ECC Pattern Register (RKECPT) Error correction pattern following
correction sequence.
Maintenance Register 2 (RKMR2) Shift register A for serial Message
A.
Maintenance Register 3 (RKMR3) Shift register B for serial Message
B.
NOTE
R/W = read/write (selected bits) in relation to
Unibus. R = read only in relation to Unibus.
*The RK611 responds to this address with SSYN. However, if the bus cycle is a DA TI, D (00: 15) is undefined.
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