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Update Survey.asm

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- Make SURVEY.COM port probing compatible with Z280
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Wayne Warthen
2020-06-09 18:17:36 -07:00
parent a5a590cc4a
commit ee2d8d31f4
1 changed files with 5 additions and 3 deletions
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8
Source/Apps/Survey.asm
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@@ -600,9 +600,11 @@ PORTLP:
mov c,a ; port number to reg c
mvi b,0 ; for 16 bit port addressing
db 0edh,078h ; z80: in a,(c)
; inactive port could return 0xFF or 0x78
CPI 0FFH
JZ NEXTPT
; inactive port could return 0xFF or 0x78 or the port address
cmp c
jz nextpt
cpi 0FFh
jz nextpt
cpi 078h
jz nextpt
ISPORT: