Search found 554 matches

by czietz
Sun Feb 18, 2018 10:11 am
Forum: Hardware
Topic: Resolution boosting thoughts
Replies: 20
Views: 720

Re: Resolution boosting thoughts

But as far as I understand, the ET4000 maxes out at 1024x768? Yes: https://archive.org/details/bitsavers_tsengLabsTicsController1990_11230195 Well, no, as I have written above: it runs e.g. 1280x800 quite nicely. This seems to suggest the maximum pixel clock is 65MHz, so how is 1366x768 possible? (...
by czietz
Sat Feb 17, 2018 8:21 pm
Forum: Hardware
Topic: Resolution boosting thoughts
Replies: 20
Views: 720

Re: Resolution boosting thoughts

Interesting, I could have sworn I saw people talking about interlaced modes. Are all ET4000s equal in that regard? I know they made a few different versions over the years. There is the ET4000 and the newer ET4000W32. Both support progressive (i.e. non-interlaced) 1024x768 and above. I imagine line...
by czietz
Sat Feb 17, 2018 4:50 pm
Forum: Hardware
Topic: Resolution boosting thoughts
Replies: 20
Views: 720

Re: Resolution boosting thoughts

- The ET4000 is limited to 1 Meg of video memory, so even if you could clock it fast enough for 1366x768, you would be limited to 16 colors then. (I will try later on my ET4000 if it would accept such a video timing.) OK, in terms of pixel clock, it is possible to do 1368x768 @ 65 Hz with an ET4000...
by czietz
Sat Feb 17, 2018 7:45 am
Forum: Hardware
Topic: Resolution boosting thoughts
Replies: 20
Views: 720

Re: Resolution boosting thoughts

Some short comments because I'm a bit in a hurry right now: - The ET4000's output is not interlaced. Where did you read otherwise? - The ET4000 is limited to 1 Meg of video memory, so even if you could clock it fast enough for 1366x768, you would be limited to 16 colors then. (I will try later on my...
by czietz
Fri Feb 16, 2018 6:12 pm
Forum: Hardware
Topic: How to: recapping the Mega STe power supply
Replies: 12
Views: 1359

Re: How to: recapping the Mega STe power supply

I'm sure that with some effort one could either find a modern day replacement optocoupler or even make it work with the CNY17 e.g. by tuning the feedback network. But I'm always a bit reluctant to measure on the mains side of a SMPS, so I opted for the easy way out: buying the PC111 that is suppose...
by czietz
Thu Feb 15, 2018 5:35 pm
Forum: Applications
Topic: Unknown extension (for me..)
Replies: 13
Views: 1048

Re: Unknown extension (for me..)

No worries. It was a fun little project to analyze and decrypt the files.
by czietz
Thu Feb 15, 2018 7:29 am
Forum: Applications
Topic: Unknown extension (for me..)
Replies: 13
Views: 1048

Re: Unknown extension (for me..)

A lot of the programs -- I didn't check all of them -- also were on the Whiteline CDs Alpha to Kappa, unencrypted: http://deltalabs.biz/atari-whiteline-cd-alpha.htm
by czietz
Wed Feb 14, 2018 6:08 pm
Forum: Applications
Topic: Unknown extension (for me..)
Replies: 13
Views: 1048

Re: Unknown extension (for me..)

After performing some cryptoanalysis on the files, I was able to deduce the encryption algorithm that was used. Fortunately, this algorithm is prone to an attack that allows the recovery of the decrypted data without knowledge of the key. Find attached a decrypted file as proof. I think it's OK to p...
by czietz
Wed Feb 14, 2018 11:46 am
Forum: Applications
Topic: Unknown extension (for me..)
Replies: 13
Views: 1048

Re: Unknown extension (for me..)

If you posted more than one GRB file, one could look for patterns and whether this is possibly a very simple encryption that can be broken without knowledge of the algorithm or the key.
by czietz
Sat Feb 10, 2018 10:17 am
Forum: HxC Floppy Emulator
Topic: Gotek, HXC and more
Replies: 28
Views: 1319

Re: Gotek, HXC and more

If you want to use USB sticks directly as a mass storage medium (i.e. run PRGs from it directly), you need some solution like the Unicorn; which requires drivers, though. The big advantage of using a Gotek (with HxC firmware) is that from the computer's perspective it looks just like a floppy drive...
by czietz
Sat Feb 10, 2018 10:00 am
Forum: Hardware
Topic: 520 ST+ - video problem
Replies: 1
Views: 140

Re: 520 ST+ - video problem

I had a similar problem as well. I had to modify my SCART cable in order to fix it by adding a diode and a capacitor like this: http://www.chzsoft.de/site/site/assets/files/1041/scart_stecker.png (Captions are in German, but I guess the schematic speaks for itself.) The reason is that pin 16 on the ...
by czietz
Sat Feb 10, 2018 9:46 am
Forum: For sale / Wanted
Topic: WANTED: ATARI TT CHIP
Replies: 1
Views: 282

Re: WANTED: ATARI TT CHIP

It's on Chandler's list: viewtopic.php?t=29116
by czietz
Fri Feb 09, 2018 7:39 pm
Forum: HxC Floppy Emulator
Topic: Gotek, HXC and more
Replies: 28
Views: 1319

Re: Gotek, HXC and more

If I understand correctly I can copy ST software to the USB-stick without modification to the ST software. So what is the importance of image-size. Isn't that a Gotek internal affaire and of no importance to the user. (I'm trying to understand the logics of the Gotek). I'm afraid you don't understa...
by czietz
Fri Feb 09, 2018 12:00 pm
Forum: HxC Floppy Emulator
Topic: Gotek, HXC and more
Replies: 28
Views: 1319

Re: Gotek, HXC and more

You cannot use 1.44mb mode with an unmodified Atari ST. However you can use HxCMount for huge images. On my website (https://www.chzsoft.de/site/hardware/usb-stick-floppy-emulator-am-atari-st/, sorry that page is in German only), I have 1.44(!) MB HFE-format floppy disk image (i.e. 80 tracks, 2 sid...
by czietz
Tue Feb 06, 2018 7:25 pm
Forum: HxC Floppy Emulator
Topic: Floppy image selection runnable from harddisk?
Replies: 13
Views: 538

Re: Floppy image selection runnable from harddisk?

and a loader/OUT.ST file, i think that is the AUTOBOOT.hfe equivalent? Probably. Since I cannot boot from drive B: (my Gotek/HxC is B: on my Atari), I didn't particularly care about the latter one. I miss a readme how to compile here...anyway I got somewhere after locating the binary references in ...
by czietz
Tue Feb 06, 2018 6:42 pm
Forum: HxC Floppy Emulator
Topic: Floppy image selection runnable from harddisk?
Replies: 13
Views: 538

Re: Floppy image selection runnable from harddisk?

The Atari version is compiled with gcc; you only need vasm. Vasm binaries for Windows and Linux are included in the Git repository: https://github.com/jfdelnero/HXCFE_file_selector/tree/master/atari_st I can also send you my version as seen in the video; however it pretty old. I didn't bother to upd...
by czietz
Tue Feb 06, 2018 6:07 pm
Forum: Other emulators & tools
Topic: ARAnyM wiki back online again
Replies: 2
Views: 359

Re: ARAnyM wiki back online again

I think the main README.md should be updated as well.
by czietz
Tue Feb 06, 2018 5:45 pm
Forum: HxC Floppy Emulator
Topic: Floppy image selection runnable from harddisk?
Replies: 13
Views: 538

Re: Floppy image selection runnable from harddisk?

Sometimes I feel I'm talking to myself here. EDIT: As soon as YouTube finishes processing, you can see a video of HXCFEMNG.PRG running from hard disk and exiting to the Desktop. This is on the MegaSTE, though. I don't know if they are compatibility issues with the Falcon. https://youtu.be/ec60gYgVu6...
by czietz
Mon Feb 05, 2018 3:03 pm
Forum: Hardware
Topic: Atari STFM - chip frequencies
Replies: 6
Views: 300

Re: Atari STFM - chip frequencies

troed wrote:MFP: 4MHz


Though the timers run with their own clock of 2.4576 MHz.
by czietz
Sun Feb 04, 2018 6:18 pm
Forum: News & Announcements
Topic: Is that really an ST prototype ?
Replies: 13
Views: 609

Re: Is that really an ST prototype ?

As you can see from keys like "Aiuto" or "Cancellare" this is an Italian keyboard. The Shift and Caps-Locks keys are not unique either, they can be seen for example here: http://www.nightfallcrew.com/wp-content/gallery/atari-1040-ste/IMG_2390.jpg. I wonder if they were standard o...
by czietz
Sun Feb 04, 2018 5:38 pm
Forum: HxC Floppy Emulator
Topic: Floppy image selection runnable from harddisk?
Replies: 13
Views: 538

Re: Floppy image selection runnable from harddisk?

That would be the way to go. I haven't checked yet if there are files on the AUTOBOOT.hfe. I assumed it was a trackloaded thing because of the loading bar.... I am looking for an hd loadedable program with exit to desktop. That's exactly what HXCFEMNG.PRG is. If you cannot extract it from AUTOBOOT....
by czietz
Sun Feb 04, 2018 3:57 pm
Forum: News & Announcements
Topic: Is that really an ST prototype ?
Replies: 13
Views: 609

Re: Is that really an ST prototype ?

LOL! This is indeed "a very unique machine", as the vendor writes. But not because it's some rare prototype but because it looks like it's been ripped apart (notice the missing chips and the damaged capacitor) and then placed into the wrong case. Also the C103088 motherboard revision is ne...
by czietz
Sun Feb 04, 2018 1:52 pm
Forum: HxC Floppy Emulator
Topic: Floppy image selection runnable from harddisk?
Replies: 13
Views: 538

Re: Floppy image selection runnable from harddisk?

Why do you have to reboot to get into the selector, anyway? Can't you simply run HXCFEMNG.PRG? I'd have to check but iirc (for my Gotek with HxC firmware at least) the program also runs from HD. (Of course the floppy images themselves have to be on the USB stick / SD card.)
by czietz
Sun Feb 04, 2018 1:46 pm
Forum: CT60 / CT63 Area
Topic: CT60e new features.
Replies: 55
Views: 7259

Re: CT60e new features.

This difference was a lot larger than I expected. Back when I started designing electronics I also learned the hard way that words like "approximately" or "typical" in data sheets are code words for "we make no promises whatsoever". Lesson: Don't trust anything where t...
by czietz
Sat Feb 03, 2018 5:07 pm
Forum: CT60 / CT63 Area
Topic: CT60e new features.
Replies: 55
Views: 7259

Re: CT60e new features.

Note that the values are wrong. From the 68060's errata sheet: S3- The nominal resistance and temperature coefficient of the internal die resistor connected across the thermal sensing pins (THERM1, THERM0) as listed in the User's Manual (rev. 1) on page 2-16 is incorrect. The correct value for the t...

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