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Parameterace_mode
TypeBoolean
Valuetrue or false


This statement enables the ACE mode if the CHARON-VAX license permits it. If this statement is omitted from the CHARON-VAX configuration file and the license permits it, "true" is the default, otherwise "false" is the default. For test purposes the ACE mechanism can be disabled with:

set cpu ace_mode=false


Info

"set cpu ace_mode=true" is ignored when the license does not permit ACE operation.

The CHARON-VAX log file displays the status of the ACE option.

The ACE mode is disabled when the host system does not meet the minimum physical requirements for this operation. If the emulator appears to not run at its normal performance, check the log file for a change in the ACE mode and verify that sufficient host resources, especially memory, are available.

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RAM

The CHARON-VAX / CHARON-PDP memory subsystem is permanently loaded and has the logical name "ram".

size

Parametersize
TypeNumeric
ValueSize of the emulated memory in MB.

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The following table lists the values of emulated RAM for various hardware models of virtual VAX/PDP11 systems:


Hardware ModelRAM size (in MB)

MinMaxDefaultIncrement
PDP11932422
PDP11942422
MicroVAX_II116161,8,16
MicroVAX_360016641616
MicroVAX_390016641616
VAXserver_360016641616
VAXserver_390016641616
VAXserver_3600_128321283232
VAXserver_3900_128321283232
MicroVAX_3100_Model_96161281616
VAXstation_4000_Model_90161281616
VAX_4000_Model_106161281616
VAX_6000_Model_310325123232
VAXserver_3600_512325123232
VAXserver_3900_512325123232
MicroVAX_3100_Model_98165121616
VAX_4000_Model_108165121616
VAX_4000_Model_700645126464
VAX_4000_Model_705645126464
VAX_66101283584128128


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Hardware Model (cont.)RAM size (in MB)

MinMaxDefaultIncrement
VAX_66201283584128128
VAX_66301283584128128
VAX_66401283584128128
VAX_66501283584128128
VAX_66601283584128128

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The KW11-L timer is used in PDP-11 system emulation. It supports a 50Hz, 60Hz and 70Hz frequency.

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kw11 frequency

A time correction mechanism handles any time slips between the emulated and the host system time. The KW11-L frequency can be set in the configuration file as follows:

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Parameterext_rom
TypeText string
ValueSpecifies a file containing external boot code


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ext_rom_address

Parameter

ext_rom_address

TypeNumeric
ValueSpecifies an offset to be used for the file specified by the ext_rom parameter

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