Search found 2128 matches

by ijor
Tue Jul 18, 2017 12:50 am
Forum: SuperCard Pro Disk Copier
Topic: SCP disk images !
Replies: 535
Views: 112658

Re: SCP disk images !

What 3.5" drive did you test? I don't see this with Samsung 321 and a few others that I have tested. TEAC combo (3.5 and 5.25). Can't check the exact model number right now. Note that they are really two piggybacked independent drives. But fitting in a single internal bay, the combo is very co...
by ijor
Fri Jul 14, 2017 6:14 pm
Forum: Hardware
Topic: CPU -> shifter bus cycle timing
Replies: 6
Views: 266

Re: CPU -> shifter bus cycle timing

So, from what you said in your other post, I guess we can theorise that CS (AKA CMPCS off the MMU) must be generated using a fixed delay inside the MMU, rather than being passed through from UDS/LDS which is where the CPU would normally indicate that it wants a device to receive the contents of the...
by ijor
Fri Jul 14, 2017 1:03 pm
Forum: Hardware
Topic: CPU -> shifter bus cycle timing
Replies: 6
Views: 266

Re: CPU -> shifter bus cycle timing

Read cycle: While CS and READ (R/W high) are asserted, the data bus is continuously driven with the value of whichever register is indexed by A1:5. When either is deasserted, shifter releases the bus. Mostly correct, except that Shifter is not really connected directly to the main data bus. It is c...
by ijor
Fri Jul 14, 2017 7:52 am
Forum: SuperCard Pro Disk Copier
Topic: SCP disk images !
Replies: 535
Views: 112658

Re: SCP disk images !

Well, now I measured with a 3.5" drive. Hall sensor or not, the jitter is not much better than the 5.25" drive I measured before. Index edge jitter is still in the order of microseconds. This is not a track shift, I captured multiple consecutive revolutions, and the index pulse relation to...
by ijor
Mon Jul 10, 2017 7:19 pm
Forum: CosmosEx
Topic: MicroCosmos sad news...
Replies: 23
Views: 2233

Re: MicroCosmos sad news...

Timing depends, of course, on the CPU as well. I don't have personal experience with the CMOS part, but the 68HC is supposed to be fully compatible, even on undocumented features. The asynchronous delays in the same cycle, such as tCO, are probable smaller (note that doesn't mean less cycles). Conce...
by ijor
Sun Jul 09, 2017 9:13 pm
Forum: SuperCard Pro Disk Copier
Topic: SCP disk images !
Replies: 535
Views: 112658

Re: SCP disk images !

JimDrew wrote:This a hall sensor that triggers on a magnet passing. It's not like an optical sensor where the index hole can be slightly off depending on how the disk centers.


It is an optical sensor. As I noted, it's a 5.25' drive, not a 3.5" one.
by ijor
Sun Jul 09, 2017 6:51 pm
Forum: SuperCard Pro Disk Copier
Topic: SCP disk images !
Replies: 535
Views: 112658

Re: SCP disk images !

Jitter from an index pulse sensor is expected, but it's only measured in tens of nanoseconds. I use standard off the shelf hall sensors in critical flight control system applications for measuring positions with incredible accuracy. I am sure every type of drive is different for accuracy, but I hav...
by ijor
Sun Jul 09, 2017 4:52 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

100% sure. Neither my TV nor Monitor support 50Hz.I can test 50Hz only on my HDMI capture card. Strange. My monitor and two TVs do support 50Hz. I'm curious how common or not this is. Not only correct clock. Pixels per line, lines per frame ... Yes, but for this purpose you actually only care about...
by ijor
Sun Jul 09, 2017 1:10 pm
Forum: Hardware
Topic: 1040STF with Flash EEPROM upgrade crashes (random number of bombs) when running any program
Replies: 37
Views: 2461

Re: 1040STF with Flash EEPROM upgrade crashes (random number of bombs) when running any program

If the address bus lines are not driven during DMA transfer, and if there are still address strobes (/AS) being generated, and if the address bus pull-ups in your machine are too weak so that the bus basically floats, then I can see ... These are all true. There is nobody to drive the address bus d...
by ijor
Sun Jul 09, 2017 1:52 am
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

50Hz is mandatory for PAL region only. Are you sure? Where do you see that in the specs? Did you actually find a TV/Monitor that doesn't support HDMI at 50Hz? Also converting 50Hz to 50Hz without syncing the frames (and it's impossible to do due to fixed HDMI timings) produces much worse stuttering...
by ijor
Sun Jul 09, 2017 1:34 am
Forum: News & Announcements
Topic: Atarimania News
Replies: 248
Views: 68374

Re: Atarimania News

Avanze wrote:Not sure where to post this; but Atarimania recently updated Colossus Chess 4.1 with a new dump but the webpage still list this as MISSING.

http://www.atarimania.com/game-atari-40 ... _1137.html


See this: http://atariage.com/forums/topic/267313 ... tarimania/
by ijor
Sat Jul 08, 2017 6:39 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

MiSTer uses scaler for HDMI output. Due to frame rate convertion (50->60) some effects and smooth scrollers will be affected. This is the price you pay for correct video output where you can use any modern TV/Monitor with HDMI. You shouldn't need to perform 50Hz to 60Hz conversion. HDMI support for...
by ijor
Fri Jul 07, 2017 3:03 am
Forum: For sale / Wanted
Topic: WTB: ST/Falcon Floppy Drive Support Posts
Replies: 8
Views: 523

Re: WTB: ST/Falcon Floppy Drive Support Posts

Yep, the brass post provides ground. And believe it or not some third party drives won't work without them. The floppy interface is very sensitive to good and common grounding, even emulators. The old HxC USB emulator (not the Gotek that uses an USB pendrive) sometimes suffers from this because norm...
by ijor
Fri Jul 07, 2017 2:57 am
Forum: News & Announcements
Topic: Call for (not so technical) questions -- Atari's product manager 1991-96
Replies: 29
Views: 1388

Re: Call for (not so technical) questions -- Atari's product manager 1991-96

Very nice, looking forward for the interview.

Since when he worked at Atari? Because if he wasn't at Atari before 1991, then most of the questions related to the early days and the original ST are not relevant.
by ijor
Fri Jun 30, 2017 12:54 pm
Forum: Hatari
Topic: MFP / CPU clock ratio
Replies: 70
Views: 4899

Re: MFP / CPU clock ratio

I typed some questions just in case. Not sure such questions are expected. It's not vital, mind you, normally we know all the answers. Interesting highly technical specific questions. But chances ... he just doesn't remember. And even if he answers because he THINKS he remembers well, he might reme...
by ijor
Fri Jun 23, 2017 8:03 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

If you don't want/need it, then simply pass. Or create other project which will have better specs and will retain binary compatibility - i will see how you will do it ;) Man, you lately seem to be take things too personally and react aggressively. I have nothing to say against your project. I prais...
by ijor
Fri Jun 23, 2017 6:13 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

Sorgelig wrote:The main relation to MiST is firmware and API.


I realize, but this is not much related to the hardware. You can have a compatible firmware in a completely different board, even using a Xilinx FPGA.
by ijor
Fri Jun 23, 2017 12:29 pm
Forum: ST(E) Clones (Suska / MiST)
Topic: MiSTer: MiST on Terasic DE10-nano board.
Replies: 227
Views: 12098

Re: MiSTer: MiST on Terasic DE10-nano board.

Great work. I always thought that using one of these board (plus some addons) is much better than building hardware from scratch. No way we could compete with their prices.

But what's the relation with the Mist??? Cores binaries aren't compatible.
by ijor
Mon Jun 12, 2017 12:49 am
Forum: Hardware
Topic: copying protected floppies -> floppy destruction?
Replies: 10
Views: 836

Re: copying protected floppies -> floppy destruction?

Only now, after a few decades, some floppies are physically so weak that reading it too many times could destroy it. This happens quite a lot with some 8-bit 5.25 disks. But in such cases the disk is already too fragile and even could be destroyed under normal usage. My personal view related to my ...
by ijor
Sun Jun 11, 2017 2:51 am
Forum: Hardware
Topic: Using Epson SD-600 5.25 drive as Drive A - jumper settings ?
Replies: 5
Views: 407

Re: Using Epson SD-600 5.25 drive as Drive A - jumper settings ?

Is that an HD (80 tracks) drive? Can't find an official manual or datasheet online. With the drive turned off move the head inwards. Boot and see if the head moves outwards as much as possible. If it doesn't, then the ST won't "see" it and it will assume there is no drive. Jumpers other th...
by ijor
Sun Jun 11, 2017 2:31 am
Forum: Hardware
Topic: copying protected floppies -> floppy destruction?
Replies: 10
Views: 836

Re: copying protected floppies -> floppy destruction?

More than an urban myth it is actually a blatant lie that some publishers wanted you to believe. Only now, after a few decades, some floppies are physically so weak that reading it too many times could destroy it. This happens quite a lot with some 8-bit 5.25 disks. But in such cases the disk is alr...
by ijor
Sun Jun 04, 2017 9:03 pm
Forum: Demos - General
Topic: Best fullscreen screen.
Replies: 83
Views: 40069

Re: Best fullscreen screen.

troed wrote:... so, I would consider my speculation to have been quite on point ;)


As usual ... :)
by ijor
Fri Jun 02, 2017 6:06 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 32
Views: 2446

Re: IMP Shifter - Interesting detail

I am not very familar with Paulo's test program. But did you try changing the unstabilizer with ESC?

As I understand, if you always get the same behavior under the same GLUE wakestate, it should mean that you are also getting always the same SHIFTER wakestate.
by ijor
Wed May 31, 2017 5:59 pm
Forum: Hardware
Topic: IMP Shifter - Interesting detail
Replies: 32
Views: 2446

Re: IMP Shifter - Interesting detail

In my other 1040STF, yes. That machine incidentally shows no glitches with the demo. However, I think you mean putting only the -38 Shifter into my 1040STFm with IMP chipset, right? That's a bigger task, I'll see if/when I can do it. Yes, I was interested to see what happens with the -38 Shifter on...

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