ZeusWPI/ass_messages
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add documentation about interrupt 0x14

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Tibo 2021-10-05 16:30:04 +02:00
parent 308d16de0b
commit bb476c4f06
1 changed files with 21 additions and 0 deletions
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21
messages.asm
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@ -14,6 +14,27 @@ start:
mov sp, 0x2000 ; initialise stack pointer
;; Interrupt 0x14, ah=0
;; bit 7 - 5 baud rate
;; 0 0 0 110
;; 0 0 1 150
;; 0 1 0 300
;; 0 1 1 600
;; 1 0 0 1200
;; 1 0 1 2400
;; 1 1 0 4800
;; 1 1 1 9600 (used)
;; bit 4 - 3 parity
;; 0 0 none (used)
;; 0 1 odd
;; 1 1 even
;; bit 2 stop bits
;; 0 1
;; 1 2
;; bit 1 - 0 data bits
;; 1 0 7
;; 1 1 8
;; initialise serial port
mov ah, 0x0 ; initialise UART
mov al, 0b111_00_0_11 ; baud 9600, no parity, 1 stop bit, 8 data bits