user manual

3
3-1
3Operating Instructions
Introduction
This chapter provides necessary information to use the MVME177
module in a system configuration. This includes:
❏ Controls and indicators
❏ Memory maps
❏ Software initialization of the module
Controls and Indicators
On the front panel of the MVME177 module are the following:
❏ ABORT and RESET switches
❏ FAIL, STAT, RUN, SCON, LAN,+12V (LAN power), SCSI,
and VME indicators
ABORT Switch S1
When enabled by software, the recessed front panel ABORT switch
generates an interrupt at a user-programmable level. It is normally
used to abort program execution and return to the 177Bug
debugger firmware located in the MVME177 EPROMs.
The ABORT switch interrupter in the VMEchip2 is an
edge-sensitive interrupter connected to the ABORT switch. This
interrupter is filtered to remove switch bounce.