Don Caprio
2014-11-08 01:28:48 UTC
Hey folks,
My Zeta SBC is not working.
What I've done:
1) Reburned the EPROM (SST 39SF040) Feb28_2009_tools_Zeta.bin
2) Replaced C25-28 caps with 0.1uf tantalum, orienting polarity as in
photo on Wiki
3) Replaced TRS202ECN (TI version) with an original Maxim MAX232CPE
4) Tested all 74 series IC's on my EPROM burner.
5) Replaced Z-80 with working one. Tried original in another SBC and it
worked
6) Tested PC term and cable (Works with other SBC)
7) Set baud rate to 38400, N81
8) Using a null modem cable from Zeta to PC
9) Using 5VDC 2A power on P6
1) Green power LED is on
I've done the UART loopback test, removed the UART, shorted pins 10 &
11 (SIN & SOUT)
No characters are echo'd on the terminal.
Any ideas? Your suggestions/comments/feedback appreciated.
Thanks.
--
Don Caprio
***@gmail.com
My Zeta SBC is not working.
What I've done:
1) Reburned the EPROM (SST 39SF040) Feb28_2009_tools_Zeta.bin
2) Replaced C25-28 caps with 0.1uf tantalum, orienting polarity as in
photo on Wiki
3) Replaced TRS202ECN (TI version) with an original Maxim MAX232CPE
4) Tested all 74 series IC's on my EPROM burner.
5) Replaced Z-80 with working one. Tried original in another SBC and it
worked
6) Tested PC term and cable (Works with other SBC)
7) Set baud rate to 38400, N81
8) Using a null modem cable from Zeta to PC
9) Using 5VDC 2A power on P6
1) Green power LED is on
I've done the UART loopback test, removed the UART, shorted pins 10 &
11 (SIN & SOUT)
No characters are echo'd on the terminal.
Any ideas? Your suggestions/comments/feedback appreciated.
Thanks.
--
Don Caprio
***@gmail.com
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