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Kprintf ( 'Waiting for GDB(0x%X) : ', sys_gdb_port ) Set_debug_traps ( ) /*setup exception handlers*/

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InitSerialPort (sys_gdb_port, 9600, UART_DATA_BIT_8, UART_PARITY_NONE, UART_STOP_BIT_1 ) /*set up the serial port*/ It requires the following three functions from the kernel to read/write from a serial port and to set up the exception handlers. For the i386 platform, GDB source includes a reference implementation of gdb-stub.c. To debug (using GDB) a kernel running on a real machine, the kernel needs to contain a GDB stub. If you are using an emulator (Bochs or QEMU), you can use the GDB stub compiled into the emulator. This requires a kernel source change and it is a must if you are running your kernel on a test(real) machine and debugging from another machine. That means the kernel should contain the remote stub to talk to the host GDB during the debug session. For example, you might use remote debugging on an operating system kernel, or on a small system which does not have a general purpose operating system powerful enough to run a full-featured debugger.”įor remote debugging, a remote stub should be implemented in the remote program that needs to be debugged. From the GDB manual, “If you are trying to debug a program running on a machine that cannot run GDB in the usual way, it is often useful to use remote debugging. To use list press esc to a black screen saying that the second drive is missing.We are interested in the remote debugging facility of GDB. Go to the resours.cfg, in the kinds quest folder, and change the sound setting to Soundblaster.drvĮxact name can be found in the same folder as the cfg file. I won't be able to test this for a few days, maybe someone els can. And the resource file states mt32, checked using list. The last version that works is from October 10 2021Īlso Mt32 is not used even if selected. I tried all 4 memory options, FreeDOS and MS-DOS and it seems to just stick. This is back in Nov 2020 and you can see it made it passed the Title screen but now in the current core it will lock after the Sierra screen when it gets to the title screen. If someone felt like a challenge then Kings Quest VII no longer works in the core and the Top 300 pack but used to back in 2020 when I built the Top 300 pack:

#BOCHS GDB CODE#

This will give you the knowledge to understand the code you may be trying to fix, it gives you the skills to create new tools you may need to investigate problems. If it were me I would focus on learning C/C++. You will start to build that foundation that will help you solve problems.

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Find something that interests you about PC architecture, MiSTer, MS-DOS, old video games, retro hardware and just learn.

These emulators have large communities with a lot of like minded and helpful people. There are other emulators to learn and experiment with: DOSBox, PCem, Qemu, Bochs. Reverse engineering is not the first thing to try.

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Ask the easy questions first: Is it plugged in, have I configured the software correctly, is it compatible with the system. When your investigating a new problem, keep it simple. ScummVM has a wiki that lists some other tools. Disassembling code, and stepping through instructions is one tool we can use to track down problems. DOSBox has a nice debugger that let you step through CPU instructions, read memory, log to the console what the system peripherals are doing. You mentioned DOSBox, which can be a method to experiment and learn how a specific piece of software works. Knowledge will help you chose good experiments (but I do a lot of blind guessing too). Once you’ve identified a problem you want fix you may need to experiment, run tests, collect data. The entire AO486 core is open source, the BIOS is open source, you can even read the MS-DOS source code: I may be biased because my background is in software development, but having a working knowledge of programming languages is like having a super power when it comes to learning. With everything being open sourced there’s so much information at your fingertips. A lot of what I’ve learned has come from reading source code. The better mental picture you have about how the big pieces of the system fit together the easier it will be theorize where things might break down and cause problems. General problem solving skills will go a long way, and you can learn the ins and outs of the PC as you go. No reason to spend 40 hours (or 200 hours) investigating a problem you could solve with one hour of research. Solved by people who probably spent many many hours to come up with the answer. I usually start with a search engine, many problems aren’t new and have been solved before.

Bochs gdb