2020-04-03 21:43:10 +02:00
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errcll: ; put return address into dx
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pop dx
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2020-04-03 19:38:33 +02:00
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errjmp: call dmpdx
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2020-04-03 21:45:49 +02:00
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xor ax, ax
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int 0x16
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int 0x19
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2020-04-03 21:43:10 +02:00
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dmpdx: ; setup bx and ah for int 10h call
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xor bx, bx
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2020-04-03 19:38:33 +02:00
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mov ah, 0x0e
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mov cl, 4
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2020-04-03 21:43:10 +02:00
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; this double-call is essentially a 4 times repeating loop
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2020-04-03 19:38:33 +02:00
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call dmpdx1
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dmpdx1: call dmpdx2
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2020-04-03 21:43:10 +02:00
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dmpdx2: ; grab highest nibble from dx
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mov al, dh
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; remove highest nibble from dx
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2020-04-03 19:38:33 +02:00
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shl dx, cl
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2020-04-03 21:43:10 +02:00
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|
; shift away second-highest nibble that we accidentally copied
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2020-04-03 19:38:33 +02:00
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shr al, cl
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2020-04-03 21:43:10 +02:00
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; map 0-9 to ascii codes for '0' to '9'
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2020-04-03 19:38:33 +02:00
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add al, 0x30
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2020-04-03 21:43:10 +02:00
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|
; if result is larger than '9', ...
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2020-04-03 19:38:33 +02:00
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|
cmp al, 0x3a
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jl dmpdx3
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2020-04-03 21:43:10 +02:00
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|
; ... add 7 so we continue at 'A'
|
2020-04-03 19:38:33 +02:00
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add al, 7
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dmpdx3: int 0x10
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ret
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