Search found 4648 matches

by Mike
Wed Nov 27, 2013 11:36 am
Forum: Hardware and Tech
Topic: Strange video problem
Replies: 18
Views: 1448

Re: Strange video problem

I took another look at the garbled display. It is possible, that the VIC registers are wrongly initialised, so the screen display start address now points to uninitialised memory. For a short explanation, '@' and the checkerboard character are 0 and 255, respectively. You find this two-byte pattern ...
by Mike
Wed Nov 27, 2013 10:59 am
Forum: General Topics
Topic: Forum moved to new host
Replies: 78
Views: 18130

Re: Forum moved to new host

Good job with all the lastest adjustments! :D

I found the link of the picture 'until 5 posts, possible spammer' displays as broken (at least on my web browser). Unless it is planned to revive that picture, it should now possibly replaced by a suitable non-vanity Rank.
by Mike
Tue Nov 26, 2013 3:49 pm
Forum: Programming
Topic: Checking Free RAM in ML
Replies: 21
Views: 3985

Re: Checking Free RAM in ML

Just like the Zp $03-$06 and $FB-FE are never used in CBM Basic or the Kernal, there is no instance of a SED. So a CLD would not be needed.... :D I know that. Don't you think that doesn't preclude that user programs might use decimal mode? That consideration is especially important, as the free mem...
by Mike
Tue Nov 26, 2013 1:01 pm
Forum: Programming
Topic: Checking Free RAM in ML
Replies: 21
Views: 3985

Re: Checking Free RAM in ML

The code below takes 92 bytes and fits in the 673-767 area. Start with SYS673. Now, that's quite a feat. And you even kept the niceties I put in to adapt to the different RAM configurations, especially regarding the screen and colour RAM base addresses. 8) I'd still keep the CLD in front of the int...
by Mike
Mon Nov 25, 2013 6:18 pm
Forum: Other Systems
Topic: Why were BASIC interpreters incompatible on old machines?
Replies: 7
Views: 1766

Re:

why didn't they make the most generic parts of the BASIC language (write to the screen, read from the keyboard, add numbers, concatenate strings, etc.) compatible across different machines You're talking bullshit here. Of course these operations you cited worked source-code compatible across most p...
by Mike
Mon Nov 25, 2013 5:59 pm
Forum: Hardware and Tech
Topic: Strange video problem
Replies: 18
Views: 1448

Re: Strange video problem

Ouch, sorry to hear about the new problems you got. The ram I got was labeled NEC 8402A5 μPD2114LC Those *are* SRAMs. However, I've seen photos of NEC µPD2114LC in the 'net with '-5' behind the type, i.e. 500 ns. If there is no indication of access time behind a hyphen, this most probably means you ...
by Mike
Mon Nov 25, 2013 4:28 pm
Forum: Programming
Topic: Checking Free RAM in ML
Replies: 21
Views: 3985

Re: Checking Free RAM in ML

I thought it might be a good idea a post a working solution before this thread dies of old age ... 10 FORT=828TO951:READA:POKET,A:NEXT:SYS828 11 DATA 120,169,83,141,20,3,169,3,141,21,3,173,3,144,41,128,9,48,141,3,144,88,96,216,56 12 DATA 165,51,229,49,133,251,165,52,229,50,133,252,248,169,0,133,3,13...
by Mike
Sat Nov 23, 2013 1:17 am
Forum: Hardware and Tech
Topic: Strange video problem
Replies: 18
Views: 1448

Re: Strange video problem

craftsman1234 wrote:5378
That's in the range of 5120 to 6143, provided by the two chips UE4 and UD4. Furthermore, the sticky bit is located in the upper nibble, so this must be UE4 at fault. I would set a socket and replace it rightaway, no point in further checking with the piggyback method you mentioned.
by Mike
Fri Nov 22, 2013 3:44 pm
Forum: Hardware and Tech
Topic: Strange video problem
Replies: 18
Views: 1448

Re: Strange video problem

two prong power supply O.K., then the 5K internal RAM consist of ten 2114 SRAMs. An additional 2114 SRAM holds the 1K nibbles for the colour RAM, but this one is not affected. If you are using no expansion is the test the same? The program only tests the internal memory in the range 4096 to 8191, n...
by Mike
Fri Nov 22, 2013 1:21 pm
Forum: Hardware and Tech
Topic: Strange video problem
Replies: 18
Views: 1448

Re: Strange video problem

If there was a hard RAM fault, the RAM test routine in the OS would end up in an endless loop (blank white screen with cyan border). There are also other types of RAM faults, where the bit cell 'forgets' the correct value, albeit only after a few µs, which would go undetected by the RAM test routine...
by Mike
Mon Nov 18, 2013 6:44 pm
Forum: General Topics
Topic: Forum moved to new host
Replies: 78
Views: 18130

Re: Forum moved to new host

How about now? Pleas[e] look if this look better. Yep. Great! Works now. Thanks! :D Is the initial URL [...] going to stay the same or do we need to update our bookmarks? I suppose so. Not only did Jeff mention this in the topic 'If you link to Denial, please link to the front page.' (with the give...
by Mike
Mon Nov 18, 2013 1:46 pm
Forum: Hardware and Tech
Topic: Cartridge ROM chip specs
Replies: 7
Views: 1708

Re: Cartridge ROM chip specs

The PROM chips on the cartridges are pin- and signal-compatible to the 23xx series. With an adapter socket or some re-routing on the cartridge PCB, 27xx EPROMs can be made to work. You should check out the FE3 (Final Expansion 3) project. It uses two microcontrollers: one of them provides a SD2IEC d...
by Mike
Mon Nov 18, 2013 1:29 pm
Forum: General Topics
Topic: Forum moved to new host
Replies: 78
Views: 18130

Re: Forum moved to new host

Erm, When i do a search on Minipaint, it shows this post as the last (page 5): [...] if I didn't make that clear enough: all expected search results for that particular example from May 2010 to Nov 2013 are missing . And I could easily find lots of other keywords, which won't give any result in that...
by Mike
Mon Nov 18, 2013 9:32 am
Forum: General Topics
Topic: Forum moved to new host
Replies: 78
Views: 18130

Re: Forum moved to new host

After 2010, Jeff had to prune the search database for space reasons. It would be good, if it could be rebuilt from the current text base. 2. Search database is indexed now. Does not seem to be quite the case, though. For an example, a search for 'minipaint' only turns up postings until May 11, 2010...
by Mike
Sun Nov 17, 2013 3:57 pm
Forum: General Topics
Topic: Forum moved to new host
Replies: 78
Views: 18130

Re: Forum moved to new host

Here's a draft of a refurbished VIC-20 logo for Denial, with the perspective being correctly applied this time: https://dateipfa.de/.Public/denial/images/tools/vic-20.png I can replace the cyan background with any other background colour, and would also add in the Denial caption. Internal links will...