Commodore Plus 4 - Page 220

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COMMAND REGISTER
The Command Reffstei is used to comroi Specilic
TransmitfReceive lections and is shown m FiQure 2
COMMAND HEGIS1ER
- U h I hFTT
PARIT\ CHECK CONTROLS
PJ= P.tii, En Roce.wxi
O30 PflrBy Receive? and Tian&mir
Parity CTiee* DsaDted
Space Parity B* Irans-miad
p i ■. ."."■--- . i- :
I—DATAIERMlUAll
BilwiurtllOT
1 - EnUMH««
BECEIVEHlfJIEBRUPIErJSBLE
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of Slatut (Wflsie-
i - ino imwnux »«
-TRA'JSVrTEf>CONTTOi.S
■
■
■J
■
D
■
■ '■», '-■
INTERHUP'
: .I .■ ■
ii ■!■■■ !
lh'..ii Ik)
:■. ii!>:!
HIS
lEVEl
rtmh
u»
Loa
Lw.
TRANSMITTER
0"
o
TranSr-it 0RK
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7 6 5 1 1
HARDWARE RESE I
- . ■■■!■■:■■ -.:
t I ■ J
.1
J (i
1
I
0
O D?s fust (m stf lo D
Figure 2. Command R*glil«r Format
NOTES
If the word length is less than 8 bits, all unused bit(s) are assigned a —
value of zero.
If a GET# does not find any data in the buffer, the character"" (a null) —
is returned.
If INPUT# is used, then the system hangs until a non-null character
and a following carriage return is received- Thus, if the CTS or DSR
line(s) disappear during character INPUT#, the system hangs in a
RESET-oniy state. This is why the INPUT# and CHRIN routines are
NOT recommended.
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