中国DOS联盟

Original situation of the DOS system:
There is a program A running normally, and the generated data is stored in a file A.

Design requirements:
Now there is a board that uses 8253 for timing interrupts, and it is connected to IRQ3, and the interrupt can be generated normally; now I have made an interrupt resident program, and I want to use the interrupt of IRQ3 to operate the file A. I use ctrl+break interrupt to simulate the file operation in the interrupt, and it always crashes. I hope that capable friends can help solve it together;

Little brother is willing to use one month's living expenses as a reward!
QQ:36014789

http://www.cn-dos.net/forum/viewthread.php?tid=35023&fpage=1

Writing files using DOS interrupts, it is recommended to use BIOS INT13H to write directly to the disk. Using DOS file write function calls is prone to interrupt reentry leading to system crashes.

Personally, I think it's not advisable to write files in an interrupt. Instead, the interrupt should set a flag, and then use the polling method to write the file.