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Equipment check is indicated for read
q:eraticns cnly, and it indicates that bad
parity was detected on a bit fattern sent
f rem the key toard to the CPU..
The read
command operation, however, is net
terminated until its normal ending point,
even if equipment check occurs ..
2 .. 27. 5 SENSE BITS 4, 5, 6, AND 7
Net used for PR-KB operations ..
2. 28 EXTERNAL
'IO
CPU FACILI'IIES ( 1052)
2. 28.1 TI (1052 DATA IN)
This location is accessed by a rrcve werd
with AS-decode=A..
TI is set to the
keyboard bit pattern when a character key
is operated.
The contents of TI are then
moved to the A-register, in the CPU, where
a Farity check is made on the byte.
Bit
0
1
0
1
2
3
4
5
6
7
p
~
UC
UC
UG
UC
:KB
KB
:KB
KB
KB
:KB
KB
bit
l:it
bit
tit
bit
tit
bit
B
A
8
4
Value
0
0
1
1
2--
1
c --
signifies
lowercase
Lowercase
Uppercase
Uppercase (Beth 0 and 1
are set to a value cf
1 for an UFFercase
character .. )
Bits 2 through 7
represent the character
bit pattern frcrr the
keyl:oard ..
Bit C is set er reset to
maintain odd Farity ..
2.28.2 TR (1052 TILT/ROTATE REGISTER)
This register can l:e tested (diagnostic) to
determine if a correct translation frcxr the
EBCD interchange code l:it pattern to the
tilt/rotate code has been n.ade.
A move
wcrd with AS-DECCDE=B can te used tc rrove
TR contents to local storage where the bits
can
be
tested.
A
branch word cannot be
used to test
TR
directly.
Bit
0
2
3
4
0
1
3
4
5
6
7
~
Tilt l:it 1
Tilt bit
2
Rotate tit 5
Rotate bit 2A
Rotate bit 2
Tilt tit 1
Rotate bit 5
Rotate l:it 2A
Rotate bit 2
Rotate tit 1
Uppercase
Character
FUnction Cycle
2-14 (7/69)
Signifies <when bit=l)
Bits 0 through 7
are coded to cause the
desired function or
tilt/rotate magnet
activation.
Bits 0 through 7
desired functicn or
tilt/rotate magnet
acti vaticn.
2.28.3 TD (1052 DIAGNOSTIC BRANCH
CONDITIONS)
A branch Con condition er en mask) word
having an AS- decode=D can be used to test
the contents of the 'ID-register.
Bit
0
Signifies (when bit is on>
1
2
3
RD-WR Share Latch
New Line Latch
4
5
6
7
Key Switch On CE Mode
Shift Cycle Latch
Lowercase Decode
Uppercase Decode
2.28.4 TT (1052 BRANCH CONDITIONS)
A l:ranch Con condition er en mask) word
with AS-decode=E can be used to test the
contents of TT.
Bits in
TT
are set/reset
ty
circuit conditions in the 1052.
Bit !\lame
0
Attention
1
Not-ready to
ready
2
Intervention
Required
3
Alter/Display
4
Keyboard check
5
Alt coding key
6
1052 share
request
7
logout latch
Signifies
(when bit value = 1)
The request key has
been q;erated.
Ready key pressed and
f crced not-ready to
ready request.
The 1052 is out of
forms or the
net- ready key has
been operated.
The alter /display key
en the CPU console
has been operated.
A farity check was
detected on a bit
t:attern sent from the
1052 keyboard to the
CPU A-register.
The alternate-coding
key is in its
OFerated position.
On when the 1052
requests service for
status or data
transfer.
Branch bit to test if
logout latch is on or
Off.
2.28.5 TU (1052 DIAGNOSTIC BRANCH
CONDITIONS)
A tranch Con condition or rrask) word with
AS-decode=F can be used to test the
contents of TU.
TU contains the :Cit values
set into
'IA
by the microprogram or 1052
hardware.
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