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005128-UK applikator
CORRECTIONS &UPDATES
537 ‘Lite’ Computer
January & February 2000,
990054
The chip select lines address the
following memory ranges:
result in driver logic reflections
on K5. Conversely if using the
PCF8574 to drive the output of
K5, the dc logic level on K4 will
adversely affect the correct oper-
ation of the PCF8574.
HotKeys Keyboard (1 & 2)
April & May 2000, 002006
If hard to find localy, the 8-MHz
ceramic resonator for this project
may be replaced by a quartz
crystal. The crystal wires are
then connected to the outer two
holes originally provided for the
resonator. Two 27pF capacitors
are connected between the crys-
tal wires and the central solder
pad.
The parts list in part 2 of the arti-
cle contains an error. The correct
type number of the caps for S1-
S16 is 707023-01.
3-Volts Car Adapter
July/August 2000, 000014
A capacitor (C2) of 100nF
(0.1 µF) should be fitted between
R2 and ground.
CS0\
E000 - E7FF
CS1\
E800 - EFFF
CS2\
F000 - F7FF
EEDTS Pro Super Loco
Decoder
October 1999, 990071
The circuit of the decoder pro-
grammer, Figure 5, contains two
transistors ‘T2’. One of these
should be labelled ‘T3’. The cor-
rect type numbers of T2 and T3
are BD680, not BD560 as shown.
The value of C4 should be 2.2nF,
not 1 nF as shown.
PIC17C Processor Board
September 2000, 000061
Contrary to what is stated in the
Components List, the -A version
of the PIC processor is suitable
for use in this circuit. The
PIC17C756A is a ‘shrink-wrap’
version of the ‘C756. The stan-
dard PIC17C756 is no longer pro-
duced.
LCD
F800 - FFFF
8-bit I/O Port
July/August 2000, 994077
Due to logic level contention,
this interface can only operate
as an 8-bit input or an 8-bit out-
put. Using the PCF8574 to mon-
itor input logic levels on K4 will
30
Elektor Electronics
11/2000
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