Search found 147 matches

by Kubik
Tue Sep 19, 2017 4:38 am
Forum: Hardware
Topic: Magafile Upgrade parts suggestions??
Replies: 2
Views: 123

Re: Magafile Upgrade parts suggestions??

The other way would be to use a SCSI drive in your Megafile. As I recall, SH204 used ACSI-to-SCSI adapter and then SCSI-to-MFM adapter and MFM drive. Those adapters appear on eBay now and then.
by Kubik
Tue Sep 12, 2017 10:04 am
Forum: Hardware
Topic: RETRO-BRITE...Best Process So Far
Replies: 9
Views: 553

Re: RETRO-BRITE...Best Process So Far

Although more expensive, I found the safest method is to immerse the whole machine in hydrogen peroxide. I buy 1 gallon of 40% concentrate for $40 and mix it 8:1 with water ending up with 5% solution. It never dries out this way hence safe, and takes about a day or two of slightly cloudy days (I fi...
by Kubik
Sat Jul 08, 2017 6:04 pm
Forum: Hardware
Topic: [Solved] Atari 1040stf ide board problems.
Replies: 10
Views: 887

Re: [Solved] Atari 1040stf ide board problems.

Wouldn't HCT work as well? When seeing people using LS, I feel so retro... :)
by Kubik
Tue Jun 20, 2017 1:32 pm
Forum: Hardware
Topic: 1040STFM Halted CPU
Replies: 30
Views: 2896

Re: 1040STFM Halted CPU

I still might have one spare PCB. It needs minor modification, but it works relatively well :) Send me a PM if you're interested. Hi Kubik, I PMd you. Hi again Kubik, Have you changed your mind re the PCB you mentioned? TeX38 I'm sorry, I have no clue what do you mean :) I have answered your PM bac...
by Kubik
Tue Jun 06, 2017 11:29 am
Forum: Hardware
Topic: 1040 STF 6 chip to 2 chip TOS 1.04 conversion
Replies: 29
Views: 2739

Re: 1040 STF 6 chip to 2 chip TOS 1.04 conversion

Sorry to hear that, but at least you had some fun :) I feel your pain, I am struggling with RTC on ST and it's the same mystery to me as the 2chip TOS is to you :)
by Kubik
Sun Jun 04, 2017 6:17 pm
Forum: Hardware
Topic: 1040 STF 6 chip to 2 chip TOS 1.04 conversion
Replies: 29
Views: 2739

Re: 1040 STF 6 chip to 2 chip TOS 1.04 conversion

Hmm, honestly, I am out of ideas. It's most likely something pretty basic, but without having the board at hand, I can't say what. If I was in this situation, I'd try a logic analyzer and see what's going on and try to guess what are the first few reads from those EPROMs. (I've just found out the $5...
by Kubik
Sun Jun 04, 2017 6:12 pm
Forum: Hardware
Topic: Solution to stripped plastic posts! (one that doesn't suck as much as epoxy+teflon)
Replies: 5
Views: 601

Re: Solution to stripped plastic posts! (one that doesn't suck as much as epoxy+teflon)

Yeah, I am positive it is because I am mixing it wrong. I have two kinds, and failed with both. The molding plastic is awesome. I used it to cover up my solder job on the TOS switcher on my 1040STe and the 030/060 switch on the Falcon. Worked great. Poor man's 3D printing? You'd better RTFM on thos...
by Kubik
Sun Jun 04, 2017 6:07 am
Forum: Hardware
Topic: Solution to stripped plastic posts! (one that doesn't suck as much as epoxy+teflon)
Replies: 5
Views: 601

Re: Solution to stripped plastic posts! (one that doesn't suck as much as epoxy+teflon)

Good hint, thanks! As for the epoxy problem - are you sure you're mixing it properly? Some epoxies use 1:1 ratio, but some don't. If you're sure you've got the ratio right, use a bit less of the hardener - it's difficult to guess the amount right if you're mixing just two tiny drops of it :) Gooey c...
by Kubik
Thu Jun 01, 2017 12:00 pm
Forum: Non Atari Platforms
Topic: ZX Spectrum reborn in a kickstarter
Replies: 14
Views: 3304

Re: ZX Spectrum reborn in a kickstarter

I'd guess implementing other cores should be possible, however, this isn't about having thousands of cores - that's what Mist (or ZX Uno) is for. This is a new ZX Spectrum, with modern design, modern technology, modern features, and yet backward compatible as much as possible, including HW compatibi...
by Kubik
Thu Jun 01, 2017 7:37 am
Forum: Non Atari Platforms
Topic: ZX Spectrum reborn in a kickstarter
Replies: 14
Views: 3304

Re: ZX Spectrum reborn in a kickstarter

farvardin wrote:very nice, but expensive as hell!

The price was supposed to be exactly the same as ZX Spectrum when released. Actually, due to inflation, it's much cheaper - those 175GPB in prices of 1982 would correspond to something like 500 GPB nowadays.
by Kubik
Sun May 28, 2017 7:19 pm
Forum: For sale / Wanted
Topic: WTB: Mega ST keyboard cable
Replies: 8
Views: 1144

Re: WTB: Mega ST keyboard cable

I believe it's straight 1:1 cable, nothing special, you could easily build it yourself.
by Kubik
Fri May 26, 2017 6:38 am
Forum: Hardware
Topic: 1040STFM Halted CPU
Replies: 30
Views: 2896

Re: 1040STFM Halted CPU

Glue has always the same main number. What you think is glue in your 520 is actually MMU :) I don't think SECAM has anything to do with it, you would still get lores picture, just B/W. It's more like a connector problem, monitor detection problem, or your monitor doesn't do 15kHz. EDIT: Now when I a...
by Kubik
Thu May 25, 2017 8:53 pm
Forum: Hardware
Topic: ST 520STFM dead - suspect psu?
Replies: 5
Views: 616

Re: ST 520STFM dead - suspect psu?

I believe 1.04 is the highest you can run on this, but 1.02 is good enough. There are also some patched TOSes, EmuTOS etc, but I'd stay with the ones you have, at least until you can confirm the thing works. If I am not mistaken, EPROMs are not pin-to-pin compatible with TOS ROM chips. The monitor c...
by Kubik
Thu May 25, 2017 9:44 am
Forum: Hardware
Topic: 1040 STF 6 chip to 2 chip TOS 1.04 conversion
Replies: 29
Views: 2739

Re: 1040 STF 6 chip to 2 chip TOS 1.04 conversion

My recommendations for tools are above :) I've realized one thing that wasn't explicitly said. If I am not mistaken, the address signals on EPROMs are 'shifted' by one - that means that A15 of EPROM is connected to A16 of CPU, A16 of EPROM is connected to A17 of CPU. That one pulse you're getting co...
by Kubik
Wed May 24, 2017 9:08 pm
Forum: Hardware
Topic: 1040 STF 6 chip to 2 chip TOS 1.04 conversion
Replies: 29
Views: 2739

Re: 1040 STF 6 chip to 2 chip TOS 1.04 conversion

As a first check, I'd verify the EPROMs are getting /CE signals, because at the moment it looks like the system doesn't start at all. It would be great if your probe was able to count the pulses as well, that way we could determine what's going on. I love my Superprobe, it helped me a lot many times...
by Kubik
Wed May 24, 2017 8:00 am
Forum: Hardware
Topic: 1040 STF 6 chip to 2 chip TOS 1.04 conversion
Replies: 29
Views: 2739

Re: 1040 STF 6 chip to 2 chip TOS 1.04 conversion

Does the floppy do the same sound when you just reset the computer? What kind of diagnostic tools do you have?
by Kubik
Tue May 23, 2017 7:49 pm
Forum: Hardware
Topic: RTC test failure
Replies: 2
Views: 398

Re: RTC test failure

Yep, I have added RTCPAL (or something similar to it). I can see the chip select signal working fine, and I can read an write registers. I didn't do any other test besides the diag cart, because it's just a bare 520ST mainboard sitting on my desk, no floppy and stuff. The goal is to have a small PCB...
by Kubik
Tue May 23, 2017 2:15 pm
Forum: News & Announcements
Topic: New production of STE 30pin simms.
Replies: 35
Views: 3391

Re: New production of STE 30pin simms.

Did you see any problems designing and testing those? I am basically about to do the same, but for 4MB SIMMs (for old MACs, SoundBlasters etc), and I wonder if there's something I should be aware of.
by Kubik
Tue May 23, 2017 1:16 pm
Forum: Hardware
Topic: STM PSU pricing poll
Replies: 13
Views: 1334

Re: STM PSU pricing poll

Yeah, I could go with a off the shelf PSU. But I'd rather build stuff myself and know its works properly. Even so, people could do that themselves anyway. I fully understand that, I am like that myself :) However, such a kit using off the shelf PSU might be interesting for different class of custom...
by Kubik
Tue May 23, 2017 11:18 am
Forum: Hardware
Topic: STM PSU pricing poll
Replies: 13
Views: 1334

Re: STM PSU pricing poll

One way to keep the price down would be to use standard PSU and just desing a case and cabling around it. If I paid something for Atari PSU, it would be for the look and feel, not the innards. Meanwell PSUs are pretty good and very reasonably priced - their 66W one (5V/12V) costs around twenty quids...
by Kubik
Tue May 23, 2017 8:33 am
Forum: Hardware
Topic: 1040STFM Halted CPU
Replies: 30
Views: 2896

Re: 1040STFM Halted CPU

TeX38 wrote:In fact, if anyone reading this subject has one hanging around unused I would love to hear from them.
I would be interested in just the bare board if available.

I still might have one spare PCB. It needs minor modification, but it works relatively well :) Send me a PM if you're interested.
by Kubik
Mon May 22, 2017 7:27 pm
Forum: Hardware
Topic: RTC test failure
Replies: 2
Views: 398

RTC test failure

Folks, does someone have working Mega and diag cart at hand? I have added the Mega RTC chip (Ricoh RP5C15) to my 520ST. I am reasonably sure it works, because I can see registers at addresses FFFC21 and above, I can see the second counter incrementing, and I can change values of most registers. Howe...
by Kubik
Mon May 22, 2017 8:56 am
Forum: Hardware
Topic: ST 520STFM dead - suspect psu?
Replies: 5
Views: 616

Re: ST 520STFM dead - suspect psu?

I think it actually needs 5V only if you don't need to boot from floppy. To check whether the board has survived the PSU failure is 5V sufficient, even a 5V wall wart should do (like one used for active USB hubs, providing 5V / 2A). That PSU failure was 95% caused by failed caps. You can try replaci...
by Kubik
Mon May 22, 2017 7:04 am
Forum: Hardware
Topic: 1040STFM Halted CPU
Replies: 30
Views: 2896

Re: 1040STFM Halted CPU

The first cycles after reset will be CPU reading content of ROM. You should see CPU reading addresses 0 - 7 and then jumping somewhere to area FC0000 - FEFFFF. In that case, CPU generates the addresses, while ROM provides the data. I'm not sure what's happening next, but I am guessing presence of ca...
by Kubik
Sun May 21, 2017 5:07 pm
Forum: Hardware
Topic: 1040STFM Halted CPU
Replies: 30
Views: 2896

Re: 1040STFM Halted CPU

If I am not mistaken, the RAM data signals go through LS244 bus drivers. You'd better check the D6 on both sides of the corresponding bus driver before spending time and effort on removing the SMD chips :)

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