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by Mike
Fri Jan 19, 2018 3:00 pm
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Re: Paddlescope

- The jitter of POTY can be minimized by not reading it out at arbitrary times. Rather, the readout should be done in a screen range, where the video signal itself is not overly modulated. Best candidate seems to be during the VBLANK time. I thought about this a bit and set the "duty cycle&quo...
by Mike
Fri Jan 19, 2018 10:40 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Re: Paddlescope

tokra wrote:Do you have an old 2-prong-VIC-20 or a newer CR-model with the DIN-plug for power?

It's the CR variant.
by Mike
Fri Jan 19, 2018 9:28 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Re: Paddlescope

Today I took the opportunity to run Paddlescope on my own VIC-20. Actually, the jitter is effectively non-existent there with POTX, I just saw some noise with an amplitude of +/- 3 units. Unfortunately, the chip does show the coupling of the video signal with POTY (even if it's not that pronounced a...
by Mike
Thu Jan 18, 2018 12:50 pm
Forum: Hardware and Tech
Topic: VIC - why 22 Columns?
Replies: 13
Views: 196

Re: VIC - why 22 Columns?

I'm wondering about that particular number "22". It could have been 20 or 24 as well, so why 22? With 22 columns, you get the maximum number of characters with an even number of columns , if you intend to keep the screen RAM size at 512 bytes or below: - 20 columns => 25 rows, 500 bytes, ...
by Mike
Fri Jan 12, 2018 1:33 am
Forum: Programming
Topic: Pet crude web browser
Replies: 2
Views: 106

Re: Pet crude web browser

Look here: HTML Walker.

You just need to add a component (hardware and software) that fetches URLs.
by Mike
Wed Jan 10, 2018 2:34 pm
Forum: Programming
Topic: cc65 and RS232 User Port Serial
Replies: 82
Views: 2111

Re: cc65 and RS232 User Port Serial

O.K., then I'll have to look deeper into it. The goal for me remains to directly couple two VIC-20s over the user port RS232, without any level shifting - and preferably without any signal inversion necessary. And, if possible, with functioning hardware handshake. Think of a 'talk' application with ...
by Mike
Tue Jan 09, 2018 4:03 pm
Forum: Programming
Topic: cc65 and RS232 User Port Serial
Replies: 82
Views: 2111

Re: cc65 and RS232 User Port Serial

Short answer, yes. Long answer: sort of. Thank you! The reason I've been asking is a WIP, that in one of its implementations would sport two VIC-20s connected with a nullmodem cable. So it's sensible for me to make a fully wired nullmodem cable (not just 3-wire, i.e. RxD <-> TxD vs GND, and RTS/CTS...
by Mike
Tue Jan 09, 2018 3:34 am
Forum: Programming
Topic: cc65 and RS232 User Port Serial
Replies: 82
Views: 2111

Re: cc65 and RS232 User Port Serial

Here's v3 of the wedge. The ISR now disables all further interrupts and processes all pending ones before re-enabling. This should cope with any combination of Tx and Rx states, as well as you pounding on the RESTORE key. I've run it for a while receiving data at 1200 baud, I've not seen a dropped ...
by Mike
Sun Jan 07, 2018 4:57 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Re: Paddlescope

Thanks! :) (also for adding the +8K/BLK1 reminder in the readme)
by Mike
Sat Jan 06, 2018 11:18 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Re: Paddlescope

shows a straight line :) At least a glimmer of hope. :) I'm taking a thorough look at all the decoupling capacitors in the RF box in the meanwhile ... whether it's useful to replace them by MIL-STD types. nice little program.... would you post the source too? i'd like to throw it into the VICE test...
by Mike
Sat Jan 06, 2018 4:50 am
Forum: Hardware and Tech
Topic: Paddlescope
Replies: 11
Views: 298

Paddlescope

Hi, y'all! To shed some light into the discussion about the Paddle jitter, here's Paddlescope : paddlescope.zip It displays the POTY paddle signal with a 208x256 pixel screen mode. Start with SYS 8192 , stop with STOP/RESTORE. With POKE8371,8 you can select POTX for display, POKE8371,9 switches back...
by Mike
Fri Jan 05, 2018 11:44 am
Forum: General Topics
Topic: The VIC 20 is brilliant thread
Replies: 5
Views: 352

Re: The VIC 20 is brilliant thread

Gyro Gearloose wrote:even if someone figures out how to install Skynet remotely on a VIC-20

I did.

that power switch is physical. Click. Off.

Skynet is patient and will just take over your VIC-20 again as soon as you switch it on. :mrgreen:
by Mike
Fri Jan 05, 2018 11:42 am
Forum: Games
Topic: Bewitched
Replies: 18
Views: 4678

Re: Bewitched

I just looked at a YouTube video of it. That are just standard 8x8 pixel characters, no raster tricks involved. Maybe you confused it because of the smaller height score line at the top.

Of course, 32 text lines only work nice with PAL ...
by Mike
Fri Jan 05, 2018 11:23 am
Forum: Programming
Topic: HiUxLife: A Hires Life for the Unexpanded VIC-20.
Replies: 6
Views: 186

Re: HiUxLife: A Hires Life for the Unexpanded VIC-20.

The pattern appears at generation 1412 and runs downwards until generation 1500 where it collides with a blinker on the left side.

But even before that there are also at least two gliders which do not survive the transition to the other side.
by Mike
Fri Jan 05, 2018 10:36 am
Forum: Programming
Topic: HiUxLife: A Hires Life for the Unexpanded VIC-20.
Replies: 6
Views: 186

Re: HiUxLife: A Hires Life for the Unexpanded VIC-20.

I just run it with no special settings. At some time I noticed a 2x2 block, split over the left and right side, was going downwards, i.e. behaved like a glider/spaceship, but it did not actually turn into one of the known small gliders. Of course it shouldn't do that, a 2x2 block is supposed to stay...

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