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by Mike
Sun Feb 25, 2018 11:49 am
Forum: Collecting and History
Topic: Cartridge identity?
Replies: 12
Views: 124

Re: Cartridge identity?

Opening the cartridge isn't going to reveal much more than there will be either a PROM or EPROM inside, soldered in or in a socket. If it's an EPROM, chances are that the protection sticker is bound to come off on the slightest touch. With the quartz window open, prolonged exposure to UV will erase ...
by Mike
Sat Feb 24, 2018 1:04 pm
Forum: Games
Topic: TNT's Z-code interpreter, and FE3
Replies: 85
Views: 20413

Re: TNT's Z-code interpreter, and FE3

My interpreter needs the +35K configuration, the one, you described above. :shock: ... O.K., then: Welcome to the Club (of the "+35K" programmers)! :mrgreen: Running the program on a real VIC-20 with a real 1541 can be painfully slow. I recommend an emulator with warp-mode or at least an ...
by Mike
Sat Feb 24, 2018 7:19 am
Forum: Games
Topic: TNT's Z-code interpreter, and FE3
Replies: 85
Views: 20413

Re: TNT's Z-code interpreter, and FE3

I have 2 penultimate cartridges too. [...] the newer one that is menu driven I am not too sure. it says "enable all memory 32kb" I checked against their website at: https://www.thefuturewas8bit.com/index.php/penultimatecart The v5.0a revision presents a menu for Memory options, which clea...
by Mike
Sat Feb 24, 2018 4:19 am
Forum: Hardware and Tech
Topic: High density
Replies: 6
Views: 136

Re: High density

Other than a DD drive cannot reliably write on HD disks due to the reasons already laid out in the thread, I'd be very surprised to see a permanent damage done to DD drive (heads) from HD disks. What I've seen in those times though - and this strictly refers to 3 1/2" DD drives and HD disks: I ...
by Mike
Sat Feb 24, 2018 3:52 am
Forum: Games
Topic: TNT's Z-code interpreter, and FE3
Replies: 85
Views: 20413

Re: TNT's Z-code interpreter, and FE3

You need a VIC (or an emulator setting) with 40K ! 32K is not enough, there must also be RAM in the block 5 ($A000-$BFFF). "+32K" is commonly referred to as the RAM configuration with RAM in BLK1..3 and BLK5. If you also use the 3K in the address range $0400..$0FFF (like Kweepa did with V...
by Mike
Fri Feb 23, 2018 2:44 am
Forum: Programming
Topic: Compression for Vic-20
Replies: 3
Views: 173

Re: Compression for Vic-20

It can be quite instructive to design and implement an own (de)compressor. :) For the second installation of the Bible Series I reused a streaming text compression scheme I once devised on the Acorn Archimedes, and where I took the idea from an article in Dr. Dobb's around 1994: it compresses three ...
by Mike
Thu Feb 22, 2018 6:54 am
Forum: Other Systems
Topic: Stroboscopes: why smartphone LED can't blink fast?
Replies: 11
Views: 151

Re: Stroboscopes: why smartphone LED can't blink fast?

[...] the OS runs on a hex-core 64bit CPU at 2 GHz [...] The CPU could even run at infinite speed: when a resource is locked it can't do anything about this. And then it waits... and waits... and waits... until the resource is available, and then the locked thread/process can continue. That's a pro...
by Mike
Thu Feb 22, 2018 5:15 am
Forum: Other Systems
Topic: Stroboscopes: why smartphone LED can't blink fast?
Replies: 11
Views: 151

Re: Stroboscopes: why smartphone LED can't blink fast?

Mike, of course when the LED is used as a stroboscope it's not driven at high power as when used as a flash unit. "Of course"? Can you really be sure that the app isn't misusing the presumably faster response of the LED when it is triggered as flash? [...] the smartphone also has a factor...
by Mike
Wed Feb 21, 2018 5:55 pm
Forum: Games
Topic: TNT's Z-code interpreter, and FE3
Replies: 85
Views: 20413

Re: TNT's Z-code interpreter, and FE3

Hi, Bit Shifter! It's nice to see your Z-code interpreter is going to have an 'official' release at last. :D It's really a screenshot from VICE emulating the VIC-20, not a fake or C64 shot. Bitmap-hosted font engines (monospaced or proportional) have been used in several releases here on Denial, so ...
by Mike
Wed Feb 21, 2018 5:43 pm
Forum: Other Systems
Topic: Stroboscopes: why smartphone LED can't blink fast?
Replies: 11
Views: 151

Re: Stroboscopes: why smartphone LED can't blink fast?

highinfidelity, LEDs used for lighting purposes are not anymore those "cold solid state components" you think of - rather, cooling efforts are necessary to dissipate excess heat: their efficiency is still less than 100%, and we're dealing with >1 W of electrical power already. Furthermore,...
by Mike
Wed Feb 21, 2018 1:42 am
Forum: Programming
Topic: BASIC compilers
Replies: 8
Views: 263

Re: Vic Compiler Program

I took a quick peek. It's most probably the same breed of Tiny BASIC compiler that has been discussed in the thread ' Should these tapes be archived? ', and to quote from there: Apparently, this only compiles mathematical programs, like the sample provided within the program. It won't compile full b...
by Mike
Sun Feb 18, 2018 3:12 pm
Forum: Hardware and Tech
Topic: reset button
Replies: 8
Views: 164

Re: reset button

i have done this mods when i was young on my Vic 20 and my CBM 8032, but as i know how to solder.... i'll solder a reset button following the pictures. O.K. :) I mean VDD not VCC , RESET is active when low.... i remember From your first post, mentioning pins #1 and #40 of the 6502, you would have c...
by Mike
Sun Feb 18, 2018 12:20 pm
Forum: Hardware and Tech
Topic: reset button
Replies: 8
Views: 164

Re: reset button

Just for you to know: /RESET is low-active, i.e. the reset pin needs to be set to low level, not high level (Vcc) to make a reset. As a rule of thumb: if you need to ask someone else where to solder inside a computer, because you cannot infer this for yourself from schematics and data sheets, in sho...
by Mike
Sun Feb 18, 2018 5:33 am
Forum: Hardware and Tech
Topic: reset button
Replies: 8
Views: 164

Re: reset button

No. You are supposed to first identify the type of your mainboard (VIC-20 or VIC-20CR), and then apply the solder job corresponding to your type of the mainboard.

If you're unsure how to proceed, you're better off with a user-port reset switch.
by Mike
Sat Feb 17, 2018 5:02 pm
Forum: Programming
Topic: Fun with CBM arithmetics
Replies: 26
Views: 4996

Re: Fun with CBM arithmetics

Regards your question of a feasible file format: you'd most probably be content with a *.prg file that executes the patch by copying the original ROM contents, doing a check whether it works on the original byte values it aims to replace, and putting the replacement bytes there. Much similar to how ...

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