SIMH multi-system simulator
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The document describes the usage of real-time clocks and interval timers in various computer system simulators. These clocks and timers have registers that can be read and written to control the clock frequency, enable interrupts, and read the current time or interval count. The clocks automatically calibrate their timing to match the actual elapsed time.
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SIMH multi-system simulator
- 2. Real Time Clock GRI-909/GRI-99 Simulator Usage name size comments RDY 1 device ready flag IENB 1 interrupt enable flag TIME 24 clock interval -
- 3. Interval Timer (CLK) IBM 7090/7094 Simulator Usage The timer (CLK) implements a 60Hz interval timer. It is disabled by default. The timer has the following registers: ➲ name size comments ➲ TRAP 1 interval timer trap flag TIME 24 tick delay -
- 4. Real Time Clock SDS 940 Simulator Usage The real-time clock (RTC) frequency can be adjusted as follows: SET RTC 60HZ set frequency to 60Hz SET RTC 50HZ set frequency to 50Hz The default is 60Hz. The clock implements these registers: name size comments PIE 1 interrupt enable TIME 24 tick interval The real-time clock autocalibrates; the clock interval is adjusted up or down so that the clock tracks actual elapsed time -
- 5. IBM 7090/7094 Simulator Usage Interval Timer (CLK) The timer (CLK) implements a 60Hz interval timer. It is disabled by default. The timer has the following registers: name size comments TRAP 1 interval timer trap flag TIME 24 tick delay -
- 6. PDP-1D Timesharing Clock (CLK) PDP-1 Simulator Usage The PDP-1D implements a timesharing clock, which operates at 1Khz. The clock has a readable counter and generates interrupts at 32 ms and 1 minute intervals. There is no other visible state. The clock is disabled by default. The clock implements these registers: name size comments CNTR 16 clock counter, range 0-5999910 The clock requires the 16-channel sequence break system and is assigned to two different SBS levels: SET CLK SBS32MS=n assign 32 msec interrupt to SBS level n SET CLK SBS1MIN=n assign 1 minute interrupt to SBS level n -
- 7. Interdata 16b/32b Simulator Usage Line Frequency Clock (LFC) - The line frequency clock (LFC) frequency can be adjusted as follows: SET LFC 60HZ set frequency to 60Hz SET LFC 50HZ set frequency to 50Hz The default is 60Hz. The line frequency clock implements these registers: name size comments IREQ 1 clock interrupt request IENB 1 clock interrupt enable IARM 1 clock interrupt armed TIME 24 clock frequency The line frequency clock autocalibrates; the clock interval is adjusted up or down so that the clock tracks actual elapsed time.
- 8. HP2100 Simulator Usage Time Base Generator (TBG) - The time base generator (TBG) may be set for diagnostic mode: SET TBG DIAG configure for diagnostic mode SET TBG CALIBRATED configure for calibrated timing mode Diagnostic mode corresponds to setting jumper W2 to position "B.” This turns off autocalibration and divides the longest time intervals down by 1000.
- 9. HP2100 Simulator Usage Time Base Generator (TBG) - Diagnostic mode corresponds to setting jumper W2 to position "B.” This turns off autocalibration and divides the longest time intervals down by 1000. The time base generator implements these registers: -
- 10. The real-time clock (RTC) line frequency can be adjusted as follows: SET RTC 60HZ set line frequency to 60Hz SET RTC 50HZ set line frequency to 50Hz The default is 60Hz. - Nova Simulator Usage Time Base Generator (TBG)
- 11. The real-time clock autocalibrates; the clock interval is adjusted up or down so that the clock tracks actual elapsed time. - Nova Simulator Usage Time Base Generator (TBG)
- 12. The real time clock (CLK) frequency can be adjusted as follows: SET CLK 60HZ set frequency to 60Hz SET CLK 50HZ set frequency to 50Hz The default is 60Hz. - H316 Simulator Usage Real Time Clock (CLK)
- 13. The real time clock (CLK) frequency can be adjusted as follows: SET CLK 60HZ set frequency to 60Hz SET CLK 50HZ set frequency to 50Hz The default is 60Hz. - H316 Simulator Usage Real Time Clock (CLK)
- 14. - H316 Simulator Usage Real Time Clock (CLK) The clock implements these registers: The real-time clock autocalibrates; the clock interval is adjusted up or down so that the clock tracks actual elapsed time.