China DOS Union

There is another question: Why does the same software such as SMARTDRV, OAKCDROM.SYS, etc. differ by tens of K.

PC-CACHE and SMARTDRV, indeed each has its own advantages and disadvantages. The advantage of PC - CACHE is that it occupies less memory, the minimum required volume is smaller (SMARTDRV cannot work normally with Windows after compression), and it can be exited from memory at any time (SMARTDRV obviously cannot). The main advantage of SMARTDRV 5.x is that it supports CD - ROM drives and has better compatibility with the Win9x interface.

As for the fact that the volumes and memory usages of programs with the same functions are quite different, that is a matter of the programmer's writing level. For example, the writing level of OAKCDROM.SYS is very low, while the writing level of VIDE - CDD.SYS is much higher, and the functions are more powerful.

When I use the third item of your 7.10 boot disk (which is the item that loads the USB driver), it freezes when loading PC-CACHE, and I can only proceed after canceling...

In addition, the screen prompts that there is an error in line 30 of CONFIG.SYS...

Below is the speech of iwons on 2003-4-2 13:02:08:
When I use the third item of your 7.10 boot disk (that is, the item that loads the USB driver), it will freeze when loading PC-CACHE, and I can only continue after CANCEL...

In addition, the screen prompts that there is an error in line 30 of CONFIG.SYS...

My machine also cannot run pc-cache.

The 30th line of CONFIG.SYS is:

DEVICEHIGH=USBCD.SYS /D:USBCD

There is no problem running it on my computer.

Regarding the issue of PC-CACHE, I'll figure out a way.

Cpu error:incorrect opcode;killing the process.

This occurred when executing the third item of your boot disk.

Then I executed the first item again, and the above information did not appear. It seems that it is not a CPU problem, nor is it a problem with the Pc-cache. I'll take another look.

I've encountered this situation too. Then I switched to version 9.0 and found all the files, and it worked normally (I don't know if it would work without finding all the files because I haven't tried). Now I'm uploading it. Open the attachment

The appearance of "Cpu error: incorrect opcode; killing the process." is the effect of the KILLER.EXE command in the boot disk, which automatically intercepts illegal instructions and prevents the system from crashing.

As for PC-CACHE, can jmcarl give it a try and see which files are the minimum needed for PC-CACHE to run normally? Because I've never had this problem on my computer, so I can't test it.

Just now, after multiple experiments, I finally found out the reason. The results are as follows:

1: When there is very little free UMB memory (less than 64K), the original PC-CACHE.COM in the boot disk will indeed crash (or be truncated by KILLER.EXE) when running;
2: The reason for the crash is not that a file is missing, but caused by compression with aPack. I switched to UPX compression and everything is normal.

The problem is solved here. I have uploaded the latest MS-DOS 7.10 boot disk (April 2nd version). The download address is:
http://newdos.yginfo.net/dosware/mdos71bd.zip