.
Baud-Rate
Setting
Initial Start
Memory Allocation and Boot-Strap
ROM
The following
shows the memory
allocation
of the Formula-l.
T h e B a u d - R a t e
o f
S e r i a l I / O P o r t s
c a n b e
s e t
f o r
e a c h
C h a n n e l - A a n d C h a n n e l - B i n d e p e n d e n t l y .
Baud-Rate is
formed by
using
‘ C h a n n e l
( f o r C h a n n e l - A ) ’ a n d .
‘Channel
(for Channel-B)’
of
this
computer’s
C T C .
T h e
B a u d - R a t e
i s s e t b y t h e D I P - S w i t c h
o n
t h e
r e a r
s i d e .
W h e n y o u i n t e n d
t o c h a n g e t h e B a u d - R a t e , n e v e r
f a i l t o d o
S y s t e m - R e s e t ,
o t h e r w i s e
t h e
c h a n g e d B a u d - R a t e
c a n n o t b e s e t .
4K
bytes
IPL System
I
Boot-Strap
ROM
Control Program
C h a n n e l - A
C h a n n e l - B
ON ON
OFF ON
64K bytes
Main Memory
Asynchronous
(Start
Stop Synchronous)
2400
ON
ON
OFF OFF ON
4800
OFF ON
OFF
OFF
9600
ON
OFF
OFF OFF ON
19200
OFF OFF OFF OFF ON
ON
ON ON
OFF
: When IPL operates, t h e c o n t e n t s o f
Strap
ROM
are transferred in this
area.
ON
OFF
F i g . 1 5 M e m o r y A l l o c a t i o n
ON ION OFF
S y n c h r o n o u s
Only
when
setting the Power-ON or the
system
is reset, the
B o o t - S t r a p R O M
b e c o m e s
a t
r e a d a b l e s t a t e , t h e r e b y o v e r l a p p e d
with main
memory.
D u r i n g t h i s t i m e ,
a d d r e s s o f
the
main memory
being at the state of "Write"
only, and CPU
e x e c u t e s
t h e
p r o g r a m i n B o o t - S t r a p R O M ,
By
the
output of ROM
d i s a b l e s i g n a l a c c o r d i n g t o t h e p r o g r a m , B o o t - S t r a p
R O M i s
parted from
the system,
a n d a l l
o f m a i n
m e m o r y
t u r n s t o t h e
s t a t e o f r e a d / w r i t e .
ON
ON
OFF ON
OFF
9600
OFF
ON
ON
OFF
19200
ON OFF
OFF ON OFF
OFF OFF
OFF ON
OFF
a
T a b l e
9
Baud-Rate Settinq