Implement (half) simple semaphore & mutex lock, and ...
authorMinep <zelong56@gmail.com>
Tue, 3 May 2022 14:22:16 +0000 (15:22 +0100)
committerMinep <zelong56@gmail.com>
Tue, 3 May 2022 14:22:16 +0000 (15:22 +0100)
Use vga cursor.
Address the issue of spurious IRQ#1 which interference key hanlder when receiving the command response byte.
Refactoring and commentings.


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