Can you modify a GBA link cable to connect to a PC parallel port to support multiboot?
Yes but you either need to run your PC only in DOS mode or else you need a small microprocessor or programmable logic in your cable. The reason is that the serial data in multiboot mode (which uses multiplayer comms mode) is asynchronous data which must be clocked in & out at 115200 bits per second. As a result, you need very precise timing in order to be able to do this. This kind of timing using a “dumb” cable is only available when using DOS or by using special protected mode programming on a PC when using windows. In addition, you must make sure that no non-maskable interrupt occurs as well. It just makes life easier to use a “smart” cable instead. In normal comms mode you can use a relatively dumb cable (just wires & voltage conversion) since the GBA relies on the PC to synchronize the flow of each data bit into & out of the GBA.
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