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TGB1718

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    Lincolnshire, UK
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    Astronomy, Science, Computing, Electronics and obviously all things Atari
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    Diablo IV

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  1. Sometimes, just putting a probe on the leg of a crystal will cause it to become unstable, is there another place to check the frequency after passing through some other device ?
  2. I think the disk version of MAC/65 fell outside of this category by returning to DOS if RESET was pressed losing everything
  3. Usually down to poor programming Maybe I'm being a bit harsh, but sometimes it depends on the program and what it's been doing whether or not it can recover from a reset. But I agree, whatever it does, it should be consistent.
  4. Now you've mentioned the LED is also not working, it's looking like pin 3 (GND) is not connected, it's the only common line to all 4 buttons and the LED
  5. Check on the junction of R39 and R40 to GND it should be +5V with RESET NOT pressed and go virtually to 0V when pressed. If it does this then it's highly likely U19, C200 or R200 are faulty. If not then check for continuity between the keyboard connector (pin 24) and the end of R40. I found if I checked with a meter on Ohms setting (with power off) that I got between 450 Ohms to 950 Ohms when START/SELECT/OPTION or RESET was pressed. If your meter has a fine tip, you can just make contact on the MB for pins 21/22/23 and 24 with the tip of the probe.
  6. If you know the location in the code, try using a HEX editor and make the changes that way
  7. When integrated into WUDSN Ide it's probably the best development environment for 6502 code, not sure of the full range of features of Atasm, but as it's MAC/65 compatible, it probably doesn't have 1/2 the features of MADS.
  8. Yes, I understand that 2A will probably do, but the general rule for all PSU's is it should be running at between 65% to 70% of the rated capacity, you shouldn't really build a 2A PSU to run at 2A all day.
  9. The output 31VAC is equivalent to the wattage, so for the 9V output it would be around 3.4 Amps. (watts/volts) A 9V 2A supply might work on a 1050, I think some people here have used them successfully, but I would think they get rather hot. My 1050 is 27VAC so it's a 3 Amp PSU
  10. I might see if they can repair mine, unfortunately it's out of warranty, but you never know as it's never really been right.
  11. If you know what the address range is that your looking for, you can use the "bx" break command to break if an address range is accessed i.e. bx "read>$b000 and read<$bfff"
  12. As others have said, looks like a good head clean will fix this, old floppies even when stored well still get a thin layer of "gunk" build up over the surface and this gets transferred to the head. When I did my old disks some years ago, I kept the drive open and had to clean the every few disks, hopefully that's all that's wrong with yours. Also check the surface of the disk, another thing that can happen is the magnetic material degrades over the years, I've had a few disks where the material has scraped off, you can see rings on the disk surface, if it's done this, it's highly likely the disk is toast.
  13. I decided to put the pullups to the capacitor as the 4069 is piggy backed only by the 5V and 0V legs, so not really a solid structure (although I did decide to use a hot glue gun at one end as it seemed rather flimsy once I had finished)
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