Search found 55 matches
- Fri Mar 24, 2023 9:37 am
- Forum: Hardware
- Topic: I'd like to propose a "FD-3000"
- Replies: 23
- Views: 2601
Re: I'd like to propose a "FD-3000"
Just a related but irrelevant aside: Back in the early 2000s, CMD created a custom disk duplicator that looked something like this, but in a larger case - the two drives were different devices and there was some custom ROM that allowed a copy upon sensing both disks were in.
Re: Druid
I always wanted to play this one, it looked interesting. But I never got around to it. Maybe one day...
- Wed Jun 16, 2021 6:13 am
- Forum: Assembly
- Topic: move sprites beyond 255 x - horizontal
- Replies: 2
- Views: 5497
Re: move sprites beyond 255 x - horizontal
Basically, what you need to do is to maintain a sprite X coordinate in memory that can be translated into the VIC Sprite X low byte and high bit registers. The simplest way would be to store sprite X in a single byte of memory and alter its value using simple inc/dec instructions. Then: 1) Load the ...
- Sun May 12, 2019 9:53 am
- Forum: Assembly
- Topic: Improved C64 Keyboard Reader
- Replies: 3
- Views: 11910
Re: Improved C64 Keyboard Reader
It works correctly. The test routine provided outputs the PETSCII character straight to the top left corner of the text screen without conversion to the equivalent screen code. The screencode for a PETSCII unshifted "A" is the spade symbol, so if you run it and press "A" then tha...
- Wed May 01, 2019 1:13 am
- Forum: Help!
- Topic: please help
- Replies: 5
- Views: 5962
Re: please help
It could be that a few years ago here in Australia the RF channel historically reserved for video devices such as videogame consoles and home computers was reassigned for other uses. If there is a nearby transmitter using that RF channel then that may be causing the interference.
- Tue Aug 07, 2018 7:30 am
- Forum: Help!
- Topic: C64 vertical lines and blank spaces.
- Replies: 2
- Views: 5415
Re: C64 vertical lines and blank spaces.
Ray Carlson's C64 diagnostics pages may help.
http://personalpages.tds.net/~rcarlsen/ ... 64c-ic.txt
So, maybe try swapping the CIAs (if socketed) and seeing if the screen changes. If so, then you'll need a new CIA.
http://personalpages.tds.net/~rcarlsen/ ... 64c-ic.txt
So, maybe try swapping the CIAs (if socketed) and seeing if the screen changes. If so, then you'll need a new CIA.
Re: U22 help.
The capacitor attached to the RAM IC may be marginal due to age or damage from the erratic PSU.
- Tue Jun 26, 2018 8:16 am
- Forum: Assembly
- Topic: Improved C64 Keyboard Reader
- Replies: 3
- Views: 11910
Improved C64 Keyboard Reader
This is an improved keyboard reader. It's main features are: - slightly shorter - about 20% faster - not dependent on interrupts or vectors - can be used with the Kernal ROM switched out - Uses a keyboard buffer - retains all the "features" of the original Kernal ROM routine It's in C64 Pr...
- Thu Apr 26, 2018 9:14 am
- Forum: News and Announcements
- Topic: Downtime
- Replies: 5
- Views: 6575
Re: Downtime
I was getting a bit worried there. Melon might be a low-traffic site, but the content is pretty good.
- Fri Apr 06, 2018 8:48 am
- Forum: Assembly
- Topic: Ongoing Project: RESM
- Replies: 0
- Views: 4591
Ongoing Project: RESM
The assembly board here is a little quiet, so I might throw one of my little pet projects into the ring for discussion. I've stripped down an earlier 6502 implementation of UML State Charts and come up with something lighter and easier to use. The code presented here is fully working, but relies on ...