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DCE-KDU controls
Display: 9 7-segment displays
Mode indication: 5 leds
Keyboard: 23 keys, 1 switch
Monitor ROM: 0000-07FF (mirror at 4000-47FF)
Option ROM: 0800-0FFF
RAM: 1000-11FF
TMS5501: 9800-980F
8255 PPI: 1C00-1C03
Monitor V1.6, 2 * 2708 EPROM
Mode indicators:
R - registers
M - memory
V -
F - function
C - (result from FCT-PROG)
switch:
RUN - running mode?
RST - monitor mode?
keys:
STEP - (usually results in Error)
MODE - changes display mode R, M, V (, F, C)
up - enter data edit mode / previous (register, memory location, ...)
FCT - enables keyboard function mode (F)
GO - (usually results in PE 0000 1)
REST - restore previous value
down - restore previous value / next (register, memory location, ...)
0 Z/I -
1 MOVE -
2 FILL -
3 LOOK -
8 PROG - does something in an enless loop with PPI port A / 0
9 TRAN -
A COMP - does something with the PPI ports
B MSTP -
Register mode
Up and down key rotates through: A nn, F nn, B nn, C nn, D nn, E nn, H nn, L nn, SP nnnn, PC nnnn, 'A nnnn
Memory mode
Pressing digits will enter a new address, shifting digits from right to left. Pressing up
once changes to data edit mode. Pressing up or down again changes the address to edit mode.
Pressing down directly after entering an address has the same function as RST, restoring
to the previous address.
V mode
Up and down key rotates through: '' nn, b' nn, dC nn, 5C nn,
'1 nnnn, '2 nnnn, '3 nnnn, '4 nnnn,
'5 nnnn, '6 nnnn, '7 nnnn
Other messages:
PE 0000 1 (when pressing GO)
do (when pressing the Up key next)
Error (when pressing STEP next)
FCT/PROG takes three arguments; 3, 2, 1. 3 should be smaller than 2, otherwise
the result is Error.
3:0000, 2:0010, 1:0000 (after much DCE-bus activity) results in
C-mode message "000 C3 FF". The relation between 3 and 2 suggests a range,
but activity duration doesn't seem related. 3:FFF0, 2:FFFF, 1:0000 results in
"FF0 00 FF"
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