Model 466-1 Adapter
72 Common Problems And Solutions
If an address conflict does not appear immediately, a specific adapter card
could work for several weeks, months, or years then fail. Placing it in a
new computer could temporarily fix the problem but component aging
may be changing the timing and drive characteristics.
9.2 Data Transfer Errors
Data transfer status information is available from the Local Status Register.
This register contains four very important pieces of information: interface
parity error (bit 7); remote bus error (bit 6); interface timeout (bit 2); remote
power off or cable disconnected (bit 0).
9.2.1 Local Status Register Bit 7: Interface Parity Error
Data are sent across the adapter cable with parity. The data are checked upon
arrival at either adapter card. If a mismatch occurs, bit 7 is set to "1"
indicating that either the actual data or the parity bit may be corrupt. The
Interface Parity Error
bit will not clear until reset via the Local Command
Register reset mechanism.
Common causes of interface parity errors:
Bent pins in one or both of the cable connectors or a bad wire connection.
A component failed on one or both adapter cards.
Power is off in the remote chassis, or the cable is disconnected.
The cable length is greater than 25 feet.
An address conflict between the remote RAM window or the Dual Port
RAM window and another hardware device or system RAM.
An address conflict between the remote RAM window and the Dual Port
RAM window.
An address conflict between the I/O window and another hardware
device.
Multiple or no SYSCLK generators in a VMEbus chassis.
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