$8040 access address $8044 function code $8048 instruction register $804c status register $8050 program counter $8052 pointer to a string describing the exeption type. If bit 0 is set (3 1) the screen is cleared, the registers are dumped and a stack backtrace is displayed. If bit 1 is set (3 2), exceptions cause the offending process to be killed, rather than rebooting the machine. This can be handy if you are doing something that may crash the system,while important things (like a hugedownload) are happening in background. Ifbit 2 is set (3 4), halt system until reset upon an exeption. If bit 3 is also set (3 c or 3 d), the first exeption only is recorded in memory at $8000 on.
option 4 1 (default) enables the printing of error messages from the floppy disk driver code. If option 4 0 is in effect these messages do not come out. option 5 0 (default) getmem returns a negative error code when out of memory. Option 5 1 causes the system to generate an internal error when the memory allocation function getmem receives a request for more memory than is available. option 6 N Sets the end-of-file character for character devices. The normal setting is $100 (no EOF character). Reads from character devices terminate when this character is read. SettingNtoanumbergreaterthan255effectivelydisables end-of-file checking.
Option 6 with no parameters prints out the current EOF character (applies from Version 3.2c on). toggles between $100 and (Ctrl D as EOF). option 7 8192 Sets the exec file stack space. You can tune it to suit the needs of your program. Alt Del option 8 0 (default) Disables the system from writing to the system blocks of a disk (blocks zero through to the start of the root directory). This is a safety feature in the blkwrite system call which will hopefully prevent the odd disk crash. option 8 1 enables writing to the system tracks. Turn this option off after use. option 9 1 (default) Enable the keyboard reset function. option 9 0 disables.
Alt Ctrl R Page 88 User Tutorial Manual 1616/OS Commands