Search found 3125 matches

by ijor
Mon Sep 07, 2020 1:15 pm
Forum: Coding
Topic: Blitter routine OK on STE, KO on Falcon (skew register)
Replies: 24
Views: 1292

Re: Blitter routine OK on STE, KO on Falcon (skew register)

If your blitted data is in CPU cache, Blitter can't access correct data until it's written to RAM, and if CPU thinks data in cache is valid, data written by Blitter won't be used. There certainly could be a cache coherence issue for data written by Blitter and read by the CPU. But not the other way...
by ijor
Mon Sep 07, 2020 1:09 pm
Forum: News & Announcements
Topic: EmuTOS 1.0
Replies: 37
Views: 2150

Re: EmuTOS 1.0

Congratulations to the team with this release. Well done!
by ijor
Sun Aug 23, 2020 2:05 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

I still have the drive which was with the board I sent to zippy. Well, for starters it might be nice to have pictures of the drive. May be one that shows the brand and the model if you can. May be to perform some tests without the board, connected directly like a "normal" drive, could be very inter...
by ijor
Fri Aug 21, 2020 12:56 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

Btw, the more I think about this, the more potential compatibility issues I find. The worst case would be in a setup with two drives where both drives might be selected (one by the computer, the other by the internal board) and interfere with each other. This might actually be the main reason why s...
by ijor
Fri Aug 21, 2020 1:53 am
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

In any case, ijor was right about the index signal being gated. Index and read data are gated by P2.5 of the 8048, introducing a head settle delay. And Index is also the unknown, P1.2, input? Where the P2.0 output is connected? Even more interesting: Read data and write gate are also gated by the s...
by ijor
Fri Aug 21, 2020 1:25 am
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 262
Views: 81681

Re: Floppy Disk Stream Image Repository

Hacker doesn't look good in AUFIT but in HxC looks better. I have moved it to the repository along with the other dumps: Hacker [GW] (Total Eclipse) [Possibly bad] Hacker dump is just fine. But for some reason AUFIT believes there is a protection when there is really not. The Pasti image might stil...
by ijor
Thu Aug 13, 2020 3:15 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

At this point I am more curious about the similar board present on some external SF354 drives. Guess it would be harder to find. Anybody here have one of those? Btw, the more I think about this, the more potential compatibility issues I find. The worst case would be in a setup with two drives where ...
by ijor
Thu Aug 13, 2020 2:57 pm
Forum: MiST
Topic: MiST in 2020
Replies: 38
Views: 2471

Re: MiST in 2020

Thanks to your hard work on the MiSTery core, I hope to buy the MiST soon. Since it is unavailable in the US (Amiga on the Lake -seems to sell Lotharek’s items in the US), I will probably end up paying the high cost of FedEx shipping since I do not think the lower cost Polish Post will be available...
by ijor
Thu Aug 13, 2020 2:47 pm
Forum: MiST
Topic: Work on the Minimig core?
Replies: 570
Views: 81158

Re: Work on the Minimig core?

The best analogy I've heard so far is to think of it a bit like overclocking; the design's guaranteed to run up to a certain speed - beyond that it might work or it might not, and how far you can push it varies from chip to chip. That's only one aspect of the timing. There are timing issues, such a...
by ijor
Tue Aug 11, 2020 2:08 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

- P1.2 not certain, could be connected to the index line of the floppy drive. ... They also do something with P2.5. If P2.5 is indeed the index pulse (probably it is) and if the index signal is gated, then it seems that the code is trying to avoid generating a partial late index pulse. This could b...
by ijor
Mon Aug 10, 2020 2:17 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

See attachment. It's an export from my Ghidra project, i.e., it would need some post processing before you can assemble it again. Thanks. This could even be on the board. I couldn't follow all traces. Now that Zippy is going to send me the board, I'll continuity test that theory, too. Thinking more...
by ijor
Mon Aug 10, 2020 1:12 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 570
Views: 81158

Re: Work on the Minimig core?

All those cores not meeting timing, IMHO, ruin the reputation of the whole FPGA non commercial community. I think this Statement is fundamentally wrong. Without these people (and I count myself among them) there would be a lot fewer cores and a much smaller community. Most of the cores are not star...
by ijor
Sun Aug 09, 2020 9:14 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

Pseudo-code of the interrupt handler in the 8048: Great work Christian. Would you mind providing the disassembler output. I think it is more useful than seudocode. I can't be sure because I cannot see all the PCB traces. But P2.5 seems to gate the "read data" line, i.e., the line where data is bein...
by ijor
Sat Aug 08, 2020 8:02 pm
Forum: Hardware
Topic: Identify This Board?
Replies: 48
Views: 3009

Re: Identify This Board?

It has 1K of ROM but only about 256 bytes used so can't be doing much. Anyone care to look at the code? I checked IDA and it doesn't specifically mention the 8048 but maybe it would work as some other Intel 8 bit architecture? Binary file dump is attached. Thanks Zippy and Sety. Couple of hi-res pi...
by ijor
Thu Aug 06, 2020 8:53 pm
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 262
Views: 81681

Re: Floppy Disk Stream Image Repository

gothmog wrote: Thu Aug 06, 2020 4:28 pm Now that's a few disks! Is it all games, or are there applications also? I've been looking for the "Megamax C" compiler for years, any chance a copy lies in one of those baskets?
Are you looking for a particular version of Megamax C or Laser C?
by ijor
Thu Aug 06, 2020 3:49 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 570
Views: 81158

Re: Work on the Minimig core?

Reputation with whom? End users? End users, ourselves the developers, people at the companies that produce commercial FPGA consoles .. pretty much everybody that is involved somehow. Yes, I'm aware of that, and I'm very careful with the SDRAM in particular. (The modified SDRAM controller delays wri...
by ijor
Wed Aug 05, 2020 12:11 pm
Forum: MiST
Topic: Work on the Minimig core?
Replies: 570
Views: 81158

Re: Work on the Minimig core?

I think it's not that bad, at least not on MiST, where there's no another soft-cpu. The TG68k should not really run at 112 MHz, however the multicycle paths in the sdc mostly solve it. I wasn't really talking specifically about this core, not even specifically about the MiST. Sadly, it became quite...
by ijor
Wed Aug 05, 2020 3:36 am
Forum: MiST
Topic: Work on the Minimig core?
Replies: 570
Views: 81158

Re: Work on the Minimig core?

Oh yes indeed! Luckily, the consequence of a timing violation in the video circuitry is a bit of jitter, not the whole thing coming crashing down in flames. (I also have a host CPU running on the 114MHz clock to replace the ARM, since the TC64 doesn't have that.) The project doesn't meet timing, bu...
by ijor
Wed Aug 05, 2020 2:00 am
Forum: C / PASCAL etc.
Topic: Lattice C - Source level debugging?
Replies: 6
Views: 717

Re: Lattice C - Source level debugging?

I'm not really very familiar with Lattice C and I haven't used it for a very long time. I am just answering because so far, nobody else did As far as I can remember Lattice C doesn't have a source level debugger. So whatever you could do with MonST is rather limited. You do can load symbols with Mon...
by ijor
Thu Jul 30, 2020 11:56 pm
Forum: Games
Topic: Robinsons Requiem
Replies: 14
Views: 1270

Re: Robinsons Requiem

Marcer wrote: Thu Jul 30, 2020 12:28 pm I have dumped some 1.44 atari disks with kryoflyx. But never managed to convert into readable .msa or .st
I suspect it is probably just an issue of the Kryoflux convertion software. Try converting the raw dumps with some other tools, like HxC.
by ijor
Wed Jul 29, 2020 3:13 pm
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 262
Views: 81681

Re: Floppy Disk Stream Image Repository

Also, I've found when I dumped a few .scp files as single sided, then Aufit didn't interpret them properly. It might be an issue with Aufit or with the Gw software. But I agree with Kodak80 that is better to dump both sides anyway. Conceivable, there might be something on the back side, even if it ...
by ijor
Wed Jul 29, 2020 3:06 pm
Forum: Games
Topic: Robinsons Requiem
Replies: 14
Views: 1270

Re: Robinsons Requiem

Kryoflux wont do.. Why not? As far i know it dont support atari 1.44mb special formats A Kryoflux should be able to dump any HD disk just fine. It is possible, however, that the Kryoflux tools can't convert the raw dump to an HD MSA file image correctly. I never tested that and I'm not very familia...
by ijor
Tue Jul 28, 2020 5:01 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 5363

Re: GOEX for ST in the making

Were you maybe planning to open source pasti so that the flashfloppy firmware could support the format Ijor? This along with support for MSA would be awesome ( sources for that are out there which it maybe an idea to ask Keir to support?). The Pasti format is not really suitable for these devices t...
by ijor
Tue Jul 28, 2020 4:58 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 5363

Re: GOEX for ST in the making

It's got a damn warranty. Stop being unreasonable. He should ask centurion tech for support not ask for help on a forum. Calm down man. Nobody is being aggressive here, so why are you? A warranty is a replacement for schematics!? Are you serious? And I am the one being unreasonable. Do you think th...
by ijor
Tue Jul 28, 2020 2:17 pm
Forum: Hardware
Topic: GOEX for ST in the making
Replies: 50
Views: 5363

Re: GOEX for ST in the making

I think you need to understand some things: centuriontech has had its products copied by China and then stocked in 'reputable' european retro stores in the past, so maybe this can help you understand their position? It was obvious that he was trying to avoid his product being copied, and it isn't d...

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