93
Table 28, POST - Code
POST-Codes
During the Power On SeEfTest, POST codes are sent to I/O port 80h. Each routine
number (hexadecimal) is sent to the post Port before the routine is called. The fol-
lowing table lists all possible POST codes:
Co de
Fu nctio n
De scr i ptio n
00h
(N one)
Hook for C pu t ype det ec tion (CP U ext ens ion)
01h
Ti mer R eset
I nit ializ es the tim er
02h
D MA R eset
Ini tial izes t he D MA c ontrol ler
03h
IR Q P OS T
I nit iali zes the int errupt c ontrol ler
04h
RT C R eset
Init ializ es R TC cont rol regis ters
05h
KB D R eset
I nit ializ es the k ey board Error codes : BA h... BFh
06h
Video B lank
Clears s creen (if 684~ pr esent )
07h
NV S Chec ks um
Calc ulat es CMO S c hec ks um
08h
N VS Def ault
Ini ti alize s C MOS if c heck sum bad
09h
RO M Chec ks um
Cal culates ROM chec ks um, s ys tem halt ed if
c heck sum bad
10h
M emory S iz ing
C heck s memor y pr esenc e, sav es s iz e in C MOS
11h
PO ST S etup
I nit ializ es memor y, s et s i nterr upt vec tors
12h
Setup O pt ion R OM
Init ial izes opt ion R OM t able
15h
Tim er Test
Enabl es tim er I RQ (I NT 8)
16h
NC P P OST
D etec ts c o-proc ess or
17h
KB D Setup
Set up k eyboard varia bles (in dat a area),
enabl es k ey board IRQ (INT 9)
18h
Vide o P OS T
I niti aliz es I S A v ideo if pres en
19h
O ptio n P OST
Det ect s non-v ideo opt ion R OM s, s tores r in
opt ion R O M t able
1Ah
Dis play PO ST
Set up PO ST wi ndow, di splay s early res ults
25h
(N one)
PS / 2 m ouse i nit hooks here i f PS 2M ex tens ion
is present
26h
F loppy P OS T
Detec ti on and init ial izat ion of f loppy dis k drives
27h
(N one)
IDE hard disk ini t hook s here if F IXE D ex tens ion
is present
28h
Serial P OS T
Detec tion and init iali zat ion of s erial ports
29h
Parallel P OST
D etec t ion and ini ti aliz ation of parallel ports
6.1.3
Содержание PCM-4330
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