24 Apr
2007
24 Apr
'07
2:47 a.m.
All:
In my research on this Hawthorne SBC I got (I contributed the disk
images to Dave?s efforts), I discovered that it was covered in various forms
in The Computer Journal (TCJ). I have many issues in the series but not all.
So, I was wondering if anyone had the complete series and whether it was
worth scanning and posting.
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://highgate.comm.sfu.ca/~rcini/classiccmp
24 Apr
24 Apr
8:34 p.m.
New subject: Got ten WY-30 Wyse terminals to fix at tv shop.
WY-30, part no: 900023-01
Intial three I checked, are non-responding and no screen. Opened up
one and found that power supply is working and correctly regulating
5V and other supplies for the CRT (heater glowing direct power from
PSU) but the deflection section not sweeping. Checked digital
section and found the 68B00 (6800) is non-functioning, not even a
reset twitter on any of signals at instant of power on. Tried
replugging the ICs, xtal is oscillating thru a IC with many outputs.
Any suggestions?
Cheers, Wizard
25 Apr
25 Apr
10:34 p.m.
New subject: Got ten WY-30 Wyse terminals to fix at tv shop.
WY-30, part no: 900023-01
Intial three I checked, are non-responding and no screen. Opened up
one and found that power supply is working and correctly regulating
5V and other supplies for the CRT (heater glowing direct power from
PSU) but the deflection section not sweeping. Checked digital
section and found the 68B00 (6800) is non-functioning, not even a
reset twitter on any of signals at instant of power on. Tried
replugging the ICs, xtal is oscillating thru a IC with many outputs.
Any suggestions?
Is the processor getting a clock signal? If not, where does it come from
(trace back from the processor).
What about the processor reset pin? Is the processor being held in the
reset state?
-tony
26 Apr
26 Apr
6:28 a.m.
New subject: Got ten WY-30 Wyse terminals to fix at tv shop.
WY-30, part no: 900023-01
Intial three I checked, are non-responding and no screen. Opened up
one and found that power supply is working and correctly regulating
5V and other supplies for the CRT (heater glowing direct power from
PSU) but the deflection section not sweeping. Checked digital
section and found the 68B00 (6800) is non-functioning, not even a
reset twitter on any of signals at instant of power on. Tried
replugging the ICs, xtal is oscillating thru a IC with many outputs.
Any suggestions?
The 30s were known for failed Flyback Transformers. I seem to remember
you can find generic replacements. Not a great terminal with lots of
failures.
If you can get one with a good tube and transformer make that your test bed.
Paxton Hoag
Astoria, OR
USA
6481
days inactive
6483
days old
3 comments
4 participants
participants (4)
-
ard＠p850ug1.demon.co.uk -
innfoclassics＠gmail.com -
jpero＠sympatico.ca -
rcini＠optonline.net