I have advanced a bit in the development of this system, however I am stuck. I do have lost the capability to add breakpoints when debugging, without them I am completely lost and cannot continue. I am sure it is the result of misconfiguration of the virtual machine, but I don't have enough experien...

Hello again. At the end I settled with 7-segment LED displays to show the diagnostics of the computer. However, the segments are driven directly, whereas I would be more interested in having an hex display. I imagine a conversion array/table may already exist somewhere around the code, so implementi...

Hello, I am starting to write the driver for a computer. It has a three 8255, one of which has a diagnostics port in its port B. Lectures on this port are done with a LED add-on that displays a the code of the last executed test. I have some skeleton of the driver, but I cannot find the library for ...

Hello, I would like to explain a communication error of mine that found its way into MAME source code. It's about the Spanish Alphatronic P2 at driver alphatpx.cpp. The Spanish ROMs and subsequent configuration should not hang from the P2 configuration but from the P2U configuration. I know because ...