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Just FYI--I also see the blue background on a Sony Trinatron TV and both Dell and Gateway LCD monitors.
by Ckelly
Mar Wed 11, 2009 7:26 pm
 
Forum: Troubleshooting
Topic: Replica 1 TE issues
Replies: 2
Views: 7720

I have a new Replica 1 TE, and I ran into a similar issue. But in my case the current keystroke is not immediately doubled, but rather the previous key is displayed (again) followed by the current key. So for example if you type 'ABC' the following happens: After 1st key, 'A', is pressed: A Then aft...
by Ckelly
Mar Sun 01, 2009 6:39 pm
 
Forum: Troubleshooting
Topic: Keyboard - every keystroke is double
Replies: 15
Views: 31088

After discussion with Vince, the solution turned out to be with the 27C64 EPROM. The solution is to tie pin 27 to +5v.
by Ckelly
Mar Sun 01, 2009 2:25 pm
 
Forum: Troubleshooting
Topic: Blinking "@", No Reset
Replies: 6
Views: 16515

Unfortunately, no. But the new problem is the same as in another thread, so I posted my new problem there. Please see my post in the "Blinking "@", No Reset" thread.
by Ckelly
Feb Wed 25, 2009 11:42 pm
 
Forum: Troubleshooting
Topic: No cursor when testing video section after initial assembly
Replies: 7
Views: 15774

After assembling a new Replica 1 TE, I am also getting this problem, i.e. I'm getting the blinking cursor on startup, but reset has no effect. I have replaced the 6502 and 6821 with spares, but this makes no difference. I have double-checked the oscillator orientation; it matches the PCB and the pic...
by Ckelly
Feb Wed 25, 2009 9:18 pm
 
Forum: Troubleshooting
Topic: Blinking "@", No Reset
Replies: 6
Views: 16515

Yes, putting in the smaller EEPROM (see last post) resolved this issue.
by Ckelly
Feb Wed 25, 2009 8:47 pm
 
Forum: Troubleshooting
Topic: No cursor when testing video section after initial assembly
Replies: 7
Views: 15774

I've verified the +3.3V to the Propeller and pin 8 on the EEPROM. But I just realized (thanks to your post) that I misread the manual and inserted the wrong EPROM for testing (the larger 27C64 instead of the smaller 24LC256). I'll test it again in a few hours. Thank you.
by Ckelly
Feb Wed 25, 2009 10:08 am
 
Forum: Troubleshooting
Topic: No cursor when testing video section after initial assembly
Replies: 7
Views: 15774

I've verified all data and address lines on the 27C64, 62256, and 6502 connection pins, and there is continuity among the corresponding pins (e.g. d0 with all other d0 pins, a1 and a1, etc.) and no shorts anywhere (e.g. between d0 and d1, etc.) Interestingly, though, I don't see any continuity betwe...
by Ckelly
Feb Wed 25, 2009 9:43 am
 
Forum: Troubleshooting
Topic: No cursor when testing video section after initial assembly
Replies: 7
Views: 15774

No cursor when testing video section after initial assembly

After some delay, I've just finished soldering all components in my Replica I TE. After connecting the ATX power supply, the LED lights up, and all GND and +5 voltages listed in the 'testing' section on page 18 in the manual are confirmed. But after connecting (only) the P8X32A-D40 and 24LC256 EEPRO...
by Ckelly
Feb Tue 24, 2009 10:35 pm
 
Forum: Troubleshooting
Topic: No cursor when testing video section after initial assembly
Replies: 7
Views: 15774

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