Started by Starglider, 09:20, 17 October 16
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Quote from: GeoffB17 on 02:50, 13 May 18If you're looking for a 'hidden' file, one way would be to use the disk within LocoScript, which will list files in various user areas. This may show up 'normal' files which might not be normally visible within CP/M.There is also a DIR variant called DISK which I believe lists files in ALL user areas, also another prog which has variants, at least one of which is called LDIR, which also lists files in all user areas.Then, the disk sector editor DU-V86 will allow display of the directory tracks, this may reveal any oddities lurking there.Another option might be to create a .DSK image of the disk, that image file can then be inspected manually using DUMP or similar. If you made such an image, and attached it, I'd gladly inspect it for you.Geoff
Quote from: Starglider on 03:25, 13 May 18My query is more about how the electric studio light pen actually works.
Quote from: JohnElliott on 01:36, 14 May 18You rang?The Electric Studio light pen is covered in my 'PCW Hardware' document, distributed with JOYCE or available
here. Section 11.4 covers the light pen, but in brief: the light pen has a 12-bit counter which starts to decrement when its light sensor is triggered, and stops when there is a horizontal retrace.
Quote from: P5ychoFox on 21:25, 14 May 18Looking forward to a PCW related retro Recipes episode. I used to have a PCW light pen and it always worked fine (no help to you I know). Such old technology but still captivating to me. I hope you get it working, keep up the great work on your channel.
Quote from: JohnElliott on 23:00, 14 May 18I'd probably try to diagnose this by writing a program that mimics the normal lightpen read function and records what values were read from the lightpen as it does so.Thinking about this: If the counter starts ticking when the pen sees the electron beam, and stops ticking when the beam hits the right margin, then if the cursor's always on the right that means the PCW is only seeing small changes in the counter. That suggests the counter's only decreasing by small amounts. Maybe one of the bits isn't rolling over?
Quote from: JohnElliott on 01:02, 15 May 18My guess would be that the problem is in the hardware of the light pen interface.I think any diagnostic program would need machine code to get an adequate response time.
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