Hi all,

To report todays progress.

Used the following QBASIC Prog. to pulse Parallel Port
at address &H378 and &H37A.

Toggling &H37A causes the program LED (connected to T3 collector)
to flash on and off. This was the design result and it was
acheived. Conclusion- Communication between computer and programmer
is OK to this extent.

Changing the value of x in the following prog, allows the monitoring
of various bits. An analogue meter connected at the various pins
indicates that fan out is not an issue at the slow rate of 1 pulse
per sec. Hopefully it shouldn't be at the higher rate.

To test READ capability following done.

1. Microcontroller removed from ZIF socket.
2. Pin39 grounded by a flying lead.
3. Read Signature byte thru software. Result FE FE FE.
4. Also grounded MSB.
5. Read Signature byte using software. Result as expected


Conclusion. Read subsystem is OK to the extent of sendind
in the data to PC.


--------------------------------
5 x = 255
10 DEF SEG = 0
15 CLS

20 FOR a = 1 TO 30

30 SELECT CASE x
CASE 255
x = 127
CASE 127
x = 255
50 END SELECT

130 PRINT a, x
140 OUT (&H378), x
150 GOSUB 170
160 NEXT a
165 END
170 FOR b = 1 TO 900000
180 NEXT b
190 RETURN
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What now?

Aurangzeb