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While digging through floppy archives i remembered that long, long time ago i was so impressed with the Golden Axe, that i tried to run it on my XT and experience was awful. My XT had no turbo mode, so it was absolutely not playable. I managed to find "problematic" part - it was a timer routine...

Let's say i want to connect two 8088 CPU to the board, NEC V20 and cycle-exact 8088-clone. All lines, except 5V Vcc, are connected to both. Will supplying Vcc to only one work? I mean won't second CPU internals mess with it?

Since i disassembled my V2 Book, i checked if a display connector, similar to the one in V1 - there's an almost ready socket for display connector in V1, all you need to do is to solder the connector, put some jumper wires or 0 resistors and file a hole in it's case. And make a DE-9 connector...

Ever since getting Book V1 i though of connecting external keyboard to it, as original one is barely usable. First point was to understand how keyboard is implemented in the Book. As @Retroplayer and @sergey found out, keyboard chip, marked "BK82C42" is actually an STC micro microcontroller...

As my Book V2 arrived not working, i decided to do a quick photo session of it's internals. If you're thinking about getting one that might help you a bit. Main board, front: You can see a good example of "Not my job" :) here (but that's not the actual problem with my V2): Back of...