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

Combined Error/Controller Clear (CERR/CCLR) - Bit 15 - As a Combined Error (CERR) indicator,
bit 15 can be set by the controller, or anyone of the drives, to indicate that a subsystem error has
occurred (Table 7-1). However, when the bit is set via program control, a controller initialize (CCLR)
operation is enabled which clears the controller and results in the clearing of bit 15 itself. Thus, if the
bit is internally set (CERR) by an error that is followed by an external set (CCLR) to initialize the
controller, bit 15 will be cleared. However, since only controller errors will be initialized by CCLR, any
error originating in a drive will remain set in the drive.
Error
Programming Error (PGE)
Illegal Function (ILF)
Format Error (FTER)
Cylinder Overflow (COE)
Invalid Disk Address (lDAE)
U nit Field Error (UFE)
UNIBUS Parity Error (UPE)
Nonexistent Drive (NED)
Drive Available Interrupt
(DAINT)
Drive Error (DRERR)
Bad Sector Error (BSERR)
Header VRC Error (HVRC)
CAUTION
When using a BIC instruction on the RKCSI register,
ensure that a 1 is set in bit 15 of the mask. If this
is not done and CERR is set, a CCLR will occur, and
the RK611 will be cleated. For example, to clear the
interrupt Enable (IE) bit (bit 6 in RKCSl), the following
instruction format is recommended:
BIC #100100, @RKCSI
Table 7-1 Combined Error (CERR)
Indicator Bit
RKCS2 bit 10
RKER bit 0
RKER bit 4 or 5
RKER bit 9
RKER bit 10
RKCS2 bit 8
RKCS2 bit 13
RKCS2 bit 12
RKDS bit 0
Message BO:T7
(FAULT)
RKER bit 7
RKER bit 8
7-5
Condition
Register written (except CCLR
SCLR) with GO set.
Illegal command in low-order 5 bits of
RKCSI.
Format or Drive Type error.
Cylinder address exceeded.
Invalid cylinder or track address detected.
Drive selection problem.
Error in 16-bit data word from main
memory.
Drive response problem.
Drive is not available (dual-access
only).
Any 1 of 21 drive error conditions.
Data transfer attempt to/from bad
sector.
Header Check indicates bad header
information.