Physical unit number
Selecting Disk Drive
0
5.25” Disk Drive
1
8” Disk Drive
: 3 retry (non seek zero)
Table 12 FDC Program Parameter
Note
Note 2
Note 3 :
Note :
D o u b l e d e n s i t y d i s k e t t e , “ T r a c k
i n “ S i d e
i s
o p e r a t i n g i n t h e s a m e m e t h o d a s o f s i n g l e d e n s i t y
d i s k e t t e .
I f y o u s e l e c t m o r e t h a n o n e d i s k d r i v e
at the same time, i t b e c o m e s a u n i t e r r o r .
W h e n u s i n g s i n g l e d e n s i t y d i s k e t t e t h e t r a n s f e r d a t a
l e n g t h i s m u l t i p l e o f 1 2 8 b y t e s , t h a t i s t o s a y
1 2 8
b y t e s x 1 , 128 bytes x 2 or 128 bytes x 3 and so
on.
A n d f o r d o u b l e d e n s i t y d i s k e t t e t h e m u l t i p l e o f
2 5 6
b y t e s .
F o r s i n g l e d e n s i t y i f y o u s e t 1 2 9 , 1 3 0 o r
some other number in between 129 bytes to 255 bytes,
t h e n i t i s a u t o m a t i c a l l y b e i n g s e t t o 2 5 6 b y t e s .
W h e n t h e t r a n s f e r d a t a l e n g t h e x c e e d s t h e c a p a c i t y o f
t h e l a s t s e c t o r o f t h e t r a c k , t h e t r a c k n u m b e r i s
r e n e w e d e x c e p t f o r t h e “ T r a c k
“ S i d e
o r t h e
l a s t t r a c k .
When you intend to retry executing expansion command,
usually always 02H value being designated.
W h e n v a l u e s o f t h e b i a s e x c e p t 3 k i n d s s h o w n i n
Table 11
FDC Command > are set, it
b e c o m e s
bias
e r r o r .
Classification
Parameter Information (0: set)
(x: no set)
Classification Command
Name
UN TK SC BY AD RY
Parameter Information
Basic
Command
o
x
x
x
x x
x x o x x
Command
I
Expansion
EREAD
I
Command
1 EWRITE
Expansion
EREAD
0
0
0
0
0
0
x
x
0
x
0
Command
o o o o o o x x
Table 13 : Parameters Setting