hi , Is it possible to read timer0 while timer2 is running parallely in a x86 PC running under DOS using assembly language(tasm).When i read the timer it gives some count within 65536 I do not know wheher it is correct.After issueing the READ BACK command it shows that timer0 is programmed for mode 3 operation.I reconfigured the mode of timer0 after
reading the 8254 datasheet.I did not work. I have to measure the time interval in microseconds between two external interrupts to a pc. As i am already using timer2 i cant use it and as timer1 is used for RAM refreshing I can't use timer1 also.As my Pc is not a PENTIUM class PC it is difficult/impossible to measure the clock cycles using RTDSC. Is there any other time 8254 IC in the PC which is accesible for the programmer?Can anyone help , please. Krishna.VJ I have posted this question in borland tasm group but did not get any answers.