Search found 612 matches

by czietz
Fri May 25, 2018 5:43 am
Forum: Hardware
Topic: Sparrow inspection
Replies: 24
Views: 1052

Re: Sparrow inspection

Actually, it seems bit 3 is bus error control, bit 5 disables the blitter. 8007 RW dv i m bs_c CPU Clock Select and misc controls c - 0 - 8 Mhz 1 - 16 Mhz s - 0 - Blitter clock 8Mhz 1 - Blitter clock CPUCLK b - 0 - Blitter Enabled 1 - Blitter Disabled m - 0 - MCUG Enabled 1 - MCUG Disabled (only if...
by czietz
Thu May 24, 2018 8:13 pm
Forum: Hardware
Topic: Sparrow inspection
Replies: 24
Views: 1052

Re: Sparrow inspection

By the way, here is the one page of an Atari Sparrow schematic that I could recover. It seems to be a very early revision, still with separate VGA and RGB connectors, so it most likely doesn't match mikro's board. At first glance it looks like a STE with chips names GSTMCU and GSTSHIFTER. But at sec...
by czietz
Thu May 24, 2018 4:02 pm
Forum: Hardware
Topic: Sparrow inspection
Replies: 24
Views: 1052

Re: Sparrow inspection

Probably you all already know, but there is an Atari spec for the Sparrow incl. registers. Unfortunately, formatting has been lost: https://forum.atari-home.de/index.php?action=dlattach;topic=13380.0;attach=12961 I wonder if mikros dump confirms the registers shown there. EDIT: As for the bus errors...
by czietz
Tue May 22, 2018 4:41 pm
Forum: Hardware
Topic: H&N Multiboard and STE
Replies: 72
Views: 9290

Re: H&N Multiboard and STE

I have to repated that this particualr card *worked* in another Atari (PAK68/3+Pnather2), unfortunatelly I don't have that setup anymore. Also, I didn't found a W32 option in the VMG4000 software provided by the latest NVDI version. Where can I find the W32 capable version? EDIT: I found the Pa...
by czietz
Mon May 21, 2018 5:04 pm
Forum: Hardware
Topic: H&N Multiboard and STE
Replies: 72
Views: 9290

Re: H&N Multiboard and STE

The MultiBoard is a VOFA clone, but it has no GALs. There are two MACH210 chips ... Yet, it could be that the logic equations in those MACH210 PLDs are not meant to support the W32(i), couldn't it? ctirad should try a regular ET4000 first to rule out any problems with his MultiBoard before experime...
by czietz
Mon May 21, 2018 4:58 pm
Forum: Hardware
Topic: H&N Multiboard and STE
Replies: 72
Views: 9290

Re: H&N Multiboard and STE

This is a ET4000 W32i card, you'll need the driver for that (and not for a regular ET4000). Also I have that particular model as well (albeit a slightly different revision) and I had to modify the GAL on my Nova adapter for it to work. Maybe there is a similar compatibility problem with the ...
by czietz
Mon May 21, 2018 4:55 pm
Forum: Professionals
Topic: Falcon Jumper wire CPU <-> U67
Replies: 5
Views: 225

Re: Falcon Jumper wire CPU <-> U67

AVEC is the signal for an auto-vector interrupt. The 68030 CPU supports auto-vectored and non-auto-vectored interrupts. Interrupts triggered by the MFP (such as for ACSI HDs) are non-auto-vectored, while some other interrupts are auto-vectored and will not work if AVEC is not generated correctly.
by czietz
Mon May 21, 2018 4:33 pm
Forum: Professionals
Topic: Falcon Jumper wire CPU <-> U67
Replies: 5
Views: 225

Re: Falcon Jumper wire CPU <-> U67

According to the service manual, it's a hotfix for Rev. 2 PCBs:
https://archive.org/stream/Atari_Falcon ... 9/mode/1up
by czietz
Thu May 17, 2018 9:19 pm
Forum: C / PASCAL etc.
Topic: Manual for Lattice C
Replies: 89
Views: 26295

Re: Manual for Lattice C

Although I cannot recommend this C-Manship book to learn the basics of C! For example for functions he uses K&R style; somewhat understandably because when the original book came out, ANSI C89 was really new. But someone who learns C today should not use a book that teaches a programming style f...
by czietz
Sun May 13, 2018 9:32 am
Forum: Hardware
Topic: "Waving" RGB output - cause?
Replies: 9
Views: 1234

Re: "Waving" RGB output - cause?

After looking at the schematics i found in the PAL video cirquitry on the mother board a small variable capacitor named C117 (2,7-10pF) i gave that component some contact spray and twitched the adjustment scew very gently back and forward. That did the trick :-) As it turns out, the guide for the A...
by czietz
Thu May 10, 2018 8:37 am
Forum: Professionals
Topic: Undocumented F030 hardware addresses...
Replies: 18
Views: 3128

Re: Undocumented F030 hardware addresses...

Oh, did anyonefigure out what $ffffff82 is/do? If one went by the Atari FALCON Product Specification -- which as I already wrote below does not describe the Falcon that was actually built -- this would be the DMA "ID byte", a read-only register. Maybe some kind of chip revision information?
by czietz
Tue May 08, 2018 3:49 pm
Forum: Professionals
Topic: Porting PalmOS apps
Replies: 5
Views: 422

Re: Porting PalmOS apps

The PalmOS API is very different from GEM, not just in terms of available functions (of course) but also conceptually. E.g. on PalmOS you would normally avoid using the C standard library (for functions such as strlen() etc.) but use OS calls instead. Memory is managed in terms of handles (not raw p...
by czietz
Sat May 05, 2018 2:21 pm
Forum: Professionals
Topic: Atari TT Black screen
Replies: 6
Views: 512

Re: Atari TT Black screen

Troubleshooting as explained in the Service Manual:
https://archive.org/stream/Atari_TT030_ ... 5/mode/2up

Which steps you can perform of course depends on the equipment you have available. Multimeter? Oscilloscope? Diagnostic cartridge?
by czietz
Sat May 05, 2018 7:42 am
Forum: Hardware
Topic: SF314 PSU dead - repair or replace?
Replies: 2
Views: 302

Re: SF314 PSU dead - repair or replace?

The (SF354) PSU that I have is glued or welded shut, so it can only be opened destructively. I'd rather replace it if it was defective. Depending on which floppy drive there is in the unit, you might even not need the +12V. But if you do, there are a lot of +5V/+12V power supplies available (e.g. Me...
by czietz
Sun Apr 29, 2018 1:39 pm
Forum: Hardware
Topic: 1040 STe not working, only displays a white screen
Replies: 14
Views: 1117

Re: 1040 STe not working, only displays a white screen

I have another STe so i could change the SIMMS, but i´m not so sure that´s the problem. Since the computer does respond, allthough not for more 1-2 seconds and then stops, is it likely the problem is the memory chips ? It's worth a try, especially given that you have working SIMMs at hand. Memory e...
by czietz
Sat Apr 28, 2018 11:54 am
Forum: Hardware
Topic: NetUSBee USB storage driver download
Replies: 35
Views: 2432

Re: NetUSBee USB storage driver download

When you use BigDOS, as suggested by Frank, there's no "special" partitioning required. Any USB stick with a MBR and a FAT16 partition will work. (I.e. no super-floppy-style USB sticks.)
by czietz
Fri Apr 27, 2018 4:34 pm
Forum: Hardware
Topic: 1040 STe not working, only displays a white screen
Replies: 14
Views: 1117

Re: 1040 STe not working, only displays a white screen

The usual suspects are:
- RAM (try with known good SIMMs or at least swap the existing ones),
- every IC that is socketed (gently pull them out and reinsert),
- power supply (measure voltage rails).

The service manual (on https://www.dev-docs.org/) also has a section on troubleshooting.
by czietz
Thu Apr 26, 2018 5:25 pm
Forum: Professionals
Topic: new TT owner ;)
Replies: 15
Views: 939

Re: new TT owner ;)

I have the Thunder/Storm set and the TOS chips that are attached, so: do I have all the recent patches? If that isn't documented on the Thunder&Storm wiki pages, you'll have to ask this question to the makers. I'm sorry; I don't know which patches (apart from support for booting from IDE) were ...
by czietz
Thu Apr 26, 2018 11:39 am
Forum: Professionals
Topic: new TT owner ;)
Replies: 15
Views: 939

Re: new TT owner ;)

Thanks but... where do you download these patches (eg. ramsize, winx, newlogo)? Most of them and many more are included in TOSPatch 3.06. Imho, TOSPatch is the most comprehensive collection of patches for different TOS versions: https://www.markusheiden.de/atari/tospatch.html. (Understanding German...
by czietz
Tue Apr 17, 2018 5:45 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

OK, then please check the other components involved in the Power-Good circuit, i.e. in the lower right-hand corner of the schematic. I.e. transistors etc. Does anything look damaged? Are the transistors getting their supply voltages?
by czietz
Mon Apr 16, 2018 8:20 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

Power Good is generated by the PSU. If I understand the circuit correctly, the delay for power good is mainly set by C23 and R29. Check that those components have the values specified in the schematics and that their solder joints are OK. R4 and R5 concern the supply voltage of the switching IC whil...
by czietz
Sun Apr 15, 2018 8:54 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

Powering up randomly is a strange behavior for a PSU, indeed. Search for cold (i.e. broken) solder joints. They might not be apparent at first glance -- look closely.
by czietz
Sun Apr 15, 2018 5:57 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

Oh, man, that sucks! Particularly considering that everything was OK with your PSU; the long startup delay being totally normal with the caps Exxos chose. I feel with you.
TT service manual: https://www.dev-docs.org/docs/htm/searc ... nd=C302483
by czietz
Sun Apr 15, 2018 4:03 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

PS: I thought this would be a good occasion to test the latest addition to my electronics lab: a differential probe that allows me to safely measure inside a mains powered switch-mode supply. On the screen shot you can see that it takes about 700 ms for the PSU in my TT to start. The blue trace show...
by czietz
Sun Apr 15, 2018 2:59 pm
Forum: Professionals
Topic: Atari TT power on delay
Replies: 14
Views: 1245

Re: Atari TT power on delay

There is definitively some noticeable delay with my two (recapped) TT/MSTE PSUs as well. It's hard to judge without a stop-watch, but I'd say a little less than one second until the power LED goes on. This can also be explained: For the switching controller to start, its supply voltage has to ramp u...

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