TEST ALL OF THE CHIPS!!!1!

By -

 In this video, Kyle and I demonstrate how the flip chip tester (FCT) works. Enjoy!



Comments

Post a Comment

Popular posts from this blog

ASR-33 Teletype: Part 3

By Anonymous -
Image
The keyboard is now greased, oiled, and (hopefully) ready to go! I decided to remove all of the keys and all of the codebars (the metal strips with notches in them under the keys) to make oiling easier. Almost every point where two parts have contact (like the pivots on the ends of the codebars or the contact points where the keys hit a metal spring under the keyboard) needed a few drops of oil. A precision oiler was incredibly helpful and sped things up immensely, while minimizing the oil spilled on the table... In the last post I mentioned replacing the ESC key with the ALT MODE key from a different keyboard. I decided to keep the original ESC key after all. This decision was made because the two keys were not identical as I thought, and on each keyboard the CTRL keys had a different design as well. I assume that the ESC key would be coded the same as the ALT MODE key, but to be safe I left it as it was. In the future I may consider swapping the CTRL keys and the ESC/ALT MODE keys ...
Read more

Serial and Other Diagnostics

By Anonymous -
Image
Warren came up from South Dakota to help us get the serial ports working and do some more diagnostics. Sunday night he made a cable to connect the serial card to the serial port on our computer tower. We are using Warrens modified copy of MTTTY (Multi Threaded TTY) as our TTY emulator. It is an old Windows program so we are running it in Wine and it has been working pretty well so far.  After On Monday... We toggled in two simple programs. One was a send/receive program and the other was a send. The send would take the data input on the right switches and display the character or number associated with that number in MTTTY on the PC. The code for that is as follows: 0200 / 7604  LAS 0201 / 6046  TLS 0202 / 6041  TSF 0203 / 5202  JMP 0204 / 5200  JMP  The LAS instruction loads the AC with the switch register. TLS Sends the AC to the serial port. TSF will skip the next line if the flag is set. JMP will jump to 202 and then the next JM...
Read more

Power Supply: The Mystery Continues

By Anonymous -
Image
I continued testing the power supply. It would work most of the time it was powered on and give the correct voltages, but then sometimes when it was powered it the +5V circuit breaker would trip. I managed to capture this on the oscilloscope The peak voltage was 5.16V and then the breaker trips and it goes down to around 1V.  Time to keep investigating the G824 module to see if there is something wrong with it. (Michael from RICM has been very helpful with troubleshooting so far).  I borrowed a nice mixed signal scope from the EE shop. It blows my HP 54200A out of the water. The +5V regulator is supplied by the +8V line. So Michael suggested looking at both of the lines as they power on to see what they look like. Not Tripped Tripped Above are the results of this. I measured the peak voltages for both lines when they tripped and didn't trip. The +5V line averaged around 6.6V when it didn't trip and averaged around 12V when it did trip. The...
Read more