*** M E M O R U M ***

Claus, The usual way for a CP/M application to return to CP/M is to do a warm boot, either through the BIOS (jp 0) or BDOS (ld c,0; jp 5). With either of these techniques you don't have to worry about the stack pointer. Alternately, providing you have not overwritten the CCP, you can reset the stack...

Claus, I don't think you can write COM files to/from tape (not in an easy way anyway). I can think of a number of solutions: 1. SD Cards for REMEMOTECH or REMEMOrizer are easy. You only need a machine with an SD card writer and Andy's "CP/M Callback Filesystem" (for Windows) or "CP/M ...

Andy, On the subject of LoadMTX, I have wondered whether another approach is possible. You mention the interrupt that occurs 125 times per second. As you know, it is possible to define a user routine that is called in response to that interrupt. I have wondered whether it would be possible to write ...

Yes, CP/M 3 supported page switching at a BDOS/application level. However providing the BIOS restores everything before returning, I see no reason why even for CP/M 2.2 the BIOS cannot page swap. The only thing that might break is application level interrupts. Many years ago I obtained the ZCRP3 sou...

I have been thinking for some time about the opposite situation. When in CP/M mode, the entire BIOS is copied into high memory and then executes from there. The system never swaps except for accessing the RAM disk. It is possible to imagine an alternate BIOS, that, whenever a BIOS call is made, swap...

Martin set a challenge <mission impossible theme> Your task should you choose to accept it, design one hypothetical system using as much from the box as possible </mission impossible theme> Note the important word hypothetical , ;) Here is my outline, details are left to the reader: It has to be a t...

This morning I received a package from AB15. After fighting my way through fifty thousand layers of packaging I found the most amazing contents. Not ony a large number of very useful and interesting chips but also all the necessary crystals connectors and switches needed to make them useful. So much...

Sorry, the -diag switches are about the only options not supported by Launch.

Bill.

Mark is however correct. A virus for CP/M is theoretically feasable. A quick Google found this discussion: https://groups.google.com/forum/#!msg/comp.os.cpm/V1-zYzA6Uzg/LR2tjD34LhAJ Contrary to what is stated there I think a virus for CP/M 2 is also possible. One target would be the Console Command ...

Launch has gone as far as I wish to take it, at least for now. It supports all the current MEMU options except the diagnostic switches. In some cases I have limitted the range of values that can be selected to what seem to me to be reasonable limits. My thanks go to Dave for testing the various rele...