(C) Pavel Fedin, Moscow.
Refinement for Profi
conflict-free connection
periphery.
I already wrote about the problem with the connection of
additional devices to your computer Profi, but it seems that I
managed to solve it. Now you are finally able conflict-free
connect to your modem, Profi, Kempston Mouse and all that
whatever. Quote shemku, allowing it to carry out.
_______
EXTIORQ
/ \ / \
_______
OUTIORQ CP / M
Signal (NO) OUTIORQ taken from
System size sockets (pin
A15). With signal CP / M is more complicated.
Look on the bottom board computer chip TM8, with output
which removed the signal (NO)
CP / M. Previous conclusion should
be free. From this conclusion and
clear signal of CP / M. I will illustrate what has been said a
couple of examples.
1) For version 5:
April 2
0 X
5 0 3 _____
1 O NOROM
July 12
2 X CP / M
13 Aug. 1 ____
3 O CP / M
September 1910
C
1 February 1911
OR O X
15
80DS
March 14 ____
O 80DS
DD46. 1533TM8.
2) For Version 4:
TM9
KP11
TM8.Vot this chip,
Conclusion 10.
O LL1
Unfortunately, I could not identify the name of this chip in
the circuit.
For other versions of Profi
signal CP / M will have to find ourselves. Just do not confuse
it with that is displayed on the system
connector! There appears (NOT) CP / M,
which must be inverted, and with this chip
it can be removed in an already proinvertirovannom form. The
resulting signal (NOT) EXTIORQ output to the system connector
on the contact A7, which is originally not used. To him,
instead of (NOT) OUTIORQ and connect the modem, Kempston Mouse
and others.
For those who still lazy
look for the signal CP / M, I suggest
the second option, which can
be made as small
board, is inserted into the system
slot and having at the other end
slot since (NOT) EXTIORQ. But note that I had not tried it. I
myself, I gathered option 1.
_______
_______ EXTIORQ
OUTIORQ July 4
1 6 1 O
May 3 O 8
____ 1 O X
CP / M +5 B
X DD - LE5.
____
Signal CP / M is taken from a contact
B30. +5 V - A5, housing - A8.
For those wishing to get to the core
the case will explain the work of this shemki.
The computer is a signal
(NOT) CP / M, the shooting straight from the port # DFFD,
realized this most TM8. It is equal to 0 when
access to additional devices, Profi, causing conflicts
resolved, and is equal to 1 when he denied. The principle of
operation of the scheme is based on blocking access to the
conflicting at the periphery of the access allowed to the
additional devices Profi. To this end, we take an inverted (NO)
CP / M and knead it with (NOT) OUTIORQ. The resulting (NOT)
EXTIORQ may be active only when additional devices Profi
disabled. That's on him instead of (NOT) OUTIORQ and hang all
that had not wanted to work. All
problem solved!
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