Search found 422 matches

by czietz
Sun Sep 24, 2017 3:13 pm
Forum: Hardware
Topic: WIFI for all ataris over serial!
Replies: 73
Views: 7229

Re: WIFI for all ataris over serial!

I have just ordered another ESP8266-based module that has the required IOs for RTS/CTS. So I might do a firmware with hardware flow control in the future. It will be some weeks though until the module even arrives. Just a short update: This is not forgotten -- although I'm currently busy with anoth...
by czietz
Sun Sep 24, 2017 1:44 pm
Forum: Hardware
Topic: NEW USB Host Controller via ACSI
Replies: 505
Views: 70893

Re: NEW USB Host Controller via ACSI

Czietz : So you've also got a boot partition which is smaller than 32 MB? Also 16 MB or less like mine? And BigDOS doesn't make it inaccesible when you boot with it in the AUTO folder? Which TOS version are you using, and is this together with HDdriver (in case yes -which version)? Like I said. I h...
by czietz
Sun Sep 24, 2017 10:02 am
Forum: Hardware
Topic: NEW USB Host Controller via ACSI
Replies: 505
Views: 70893

Re: NEW USB Host Controller via ACSI

BigDOS only allows FAT16 partitions to be used, these are not TOS partitions. You need to create the type field as $06 to use them with BigDOS, but they can be up to 2GB. BigDOS also disables <32MB partitions, so make sure any partition is bigger than that. Well, it's certainly good that my BigDOS ...
by czietz
Sun Sep 24, 2017 8:09 am
Forum: Hardware
Topic: NEW USB Host Controller via ACSI
Replies: 505
Views: 70893

Re: NEW USB Host Controller via ACSI

Atari GEMDOS FAT implementation has some restrictions -- the most notable being that on TOS versions 1-3 a cluster must not be bigger than 16384 bytes. (Bad choice of a signed int16 to hold the cluster size.) Other limits are described in the following document, section 9.3: http://info-coach.fr/ata...
by czietz
Sat Sep 23, 2017 7:20 pm
Forum: Hardware
Topic: NEW USB Host Controller via ACSI
Replies: 505
Views: 70893

Re: NEW USB Host Controller via ACSI

I find that older (e.g. 1 GB) USB flash drives are usually partitioned and formatted as FAT16 and so when used together with BigDOS will work right out of the box, i.e. without re-partitioning with HDDRUTIL. Now that Alan has removed the Malloc calls, there also shouldn't be any random crashes with ...
by czietz
Sat Sep 23, 2017 10:47 am
Forum: Hardware
Topic: NEW USB Host Controller via ACSI
Replies: 505
Views: 70893

Re: NEW USB Host Controller via ACSI

Fortunately, the offending instruction is 0x1686 or MOVE.B D6,(A3), a rare instruction that occurs only once in the Unicorn drivers, more precisely in USB.PRG. So I guess this is the location of the crash. At this location we have ... [...] move.w #$48,-(sp) ; Malloc [...] However, it is not normal...
by czietz
Fri Sep 22, 2017 3:28 pm
Forum: Hardware
Topic: MegaSTe hardware problems -help locate it please!
Replies: 73
Views: 4568

Re: MegaSTe hardware problems -help locate it please!

I think you're right about "ALT" meaning alternative filters as this doesn't seem to be a critical valued part. According to the list there are 5 options, but the ZJSR5101-102 isn't mentioned. How did you figure out that one? I have a STe service manual (probably downloaded from dev-docs)...
by czietz
Fri Sep 22, 2017 6:17 am
Forum: Hardware
Topic: MegaSTe hardware problems -help locate it please!
Replies: 73
Views: 4568

Re: MegaSTe hardware problems -help locate it please!

How do you find equivalents for components like this? Is it a matter of knowing your stuff, understanding datasheets and comparing, or are there dedicated websites/databases for this very thing? In this case I knew beforehand that Murata makes EMI filters so I went to their website to see if they s...
by czietz
Thu Sep 21, 2017 8:20 pm
Forum: Hardware
Topic: MegaSTe hardware problems -help locate it please!
Replies: 73
Views: 4568

Re: MegaSTe hardware problems -help locate it please!

Murata still make comparable EMI filters, part no. DSS1NB32A102.
Maybe you'll be able to find a local electronics distributor that will sell you small quantities at a reasonable price.
by czietz
Tue Sep 19, 2017 8:13 pm
Forum: Hardware
Topic: MegaSTe hardware problems -help locate it please!
Replies: 73
Views: 4568

Re: MegaSTe hardware problems -help locate it please!

Are they all the same? The schematics say nothing about their values. The STE (not MegaSTE) service manual mentions them as "noise filters" and gives several possible suppliers. Luckily, for the TDK part number ZJSR5101-102 a datasheet can still be found: http://pdf1.alldatasheet.com/data...
by czietz
Tue Sep 19, 2017 5:51 am
Forum: Hardware
Topic: MegaSTe hardware problems -help locate it please!
Replies: 73
Views: 4568

Re: MegaSTe hardware problems -help locate it please!

As you've noticed L305 /L306 are only supposed to have two actual connections. However, components with only two pins are prone to wobble back and forth so sometimes coils / inductors / transformers have extra legs which are not connected to any part of the coil winding. Their job is just to provid...
by czietz
Tue Sep 12, 2017 5:31 pm
Forum: Hardware
Topic: RETRO-BRITE...Best Process So Far
Replies: 9
Views: 545

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

You can't buy 40% hydrogen peroxide in most parts of the world, the highest concentration available (at least without some kind of permit) is 12%. Note that those big bottles with the number "40" on it usually are "40 volume" not "40%" hydrogen peroxide. 40 volume = 12%.
by czietz
Sun Sep 10, 2017 1:09 pm
Forum: Professionals
Topic: What is this graphics card?
Replies: 35
Views: 2420

Re: What is this graphics card?

Imagine is just an older name for the Nova graphic cards.
by czietz
Sat Sep 09, 2017 1:04 pm
Forum: Hardware
Topic: ELCO high density floppy module - anyone had any experience with this?
Replies: 32
Views: 4565

Re: ELCO high density floppy module - anyone had any experience with this?

As for why this was done in this seemingly strange way (why not let the drive detect the density?), I can only speculate: As far as I know, 5.25" floppies had no notches or holes to indicated HD. So when IBM added HD floppy drive support to the AT, the computer had to tell the drive which densi...
by czietz
Sat Sep 09, 2017 11:13 am
Forum: Hardware
Topic: ELCO high density floppy module - anyone had any experience with this?
Replies: 32
Views: 4565

Re: ELCO high density floppy module - anyone had any experience with this?

So on normal STs (ST, STF, STFM, (Mega ST?) and STE ) pin 2 on the floppy drive is an input signal, while on the Mega STe, TT and Falcon it's an output signal? No, it's the other way around, just as Frank wrote. On the MegaSTe, the TT, the Falcon (and on the IBM PC as well) pin2 on the floppy drive...
by czietz
Fri Sep 08, 2017 8:52 pm
Forum: Hardware
Topic: NETUSBee problem on TT
Replies: 7
Views: 273

Re: NETUSBee problem on TT

How would this be a network configuration error if the test program even fails to read the chip ID from the network chip? "Passed 0/100000" means that it actually failed every single time.
by czietz
Wed Aug 30, 2017 2:06 pm
Forum: Hardware
Topic: GAMECART, a hidden register in the STE
Replies: 24
Views: 1646

Re: GAMECART, a hidden register in the STE

I also noticed that this register is mentioned in TT MCU Functional Description, with a setting called "game mode", so it should be present in the TT as well BTW: In the meantime it has been confirmed that said register indeed exists in the TT and that it behaves just like in the STE. Not...
by czietz
Mon Aug 28, 2017 10:24 am
Forum: Hardware
Topic: Please Help (Fried Pins) I think i am slowly killing my STE
Replies: 53
Views: 1600

Re: Please Help (Fried Pins) I think i am slowly killing my STE

One thing to check for -- since you're not using galvanic isolation with e.g. optocouplers or relays -- is ground potential differences. Do you measure a voltage between your car track's ground and the STE's ground? In circuit 2, do you measure a voltage across the 150 ohms resistor, indicating that...
by czietz
Thu Aug 24, 2017 1:30 pm
Forum: Professionals
Topic: The Falcon's confusing history
Replies: 60
Views: 5611

Re: The Falcon's confusing history

mikro wrote:For instance the STPLUS covered in the source has IDE, colour capabilities similar to TT and yet it's not TT.


Could you please point me to the file (and line of code) where you found this? I remember this differently.
by czietz
Thu Aug 24, 2017 12:58 pm
Forum: Professionals
Topic: The Falcon's confusing history
Replies: 60
Views: 5611

Re: The Falcon's confusing history

Let me expand on this: ⋅  The _MCH cookie 0x00010001 was meant for the never released STPAD. ⋅  In internal Atari documents, the term STPLUS is sometimes used as a synonym for everything better than an ST, e.g. STe, MegaSTe. ⋅  There was however an ST e-PLUS -- unreleas...
by czietz
Wed Aug 23, 2017 6:59 pm
Forum: Hardware
Topic: WIFI for all ataris over serial!
Replies: 73
Views: 7229

Re: WIFI for all ataris over serial!

Thanks for the feedback. I shall add a note to the description on my website. Usually ESP-01 modules come pre-programmed with some firmware, e.g. the default AT command firmware, so flashing the esp_init_data_default.bin is not necessary before flashing the SLIP router firmware. But it seems your mo...
by czietz
Wed Aug 23, 2017 11:27 am
Forum: Hardware
Topic: WIFI for all ataris over serial!
Replies: 73
Views: 7229

Re: WIFI for all ataris over serial!

This repetitive, seemingly binary data could mean that the module is crashing and thus constantly rebooting. The ESP8266 will output its boot messages at the slightly unusual baudrate of 74880 bit/s. I don't know if the Falcon can be set to this, but if you connect the module to your PC again and us...
by czietz
Wed Aug 23, 2017 8:17 am
Forum: Hardware
Topic: WIFI for all ataris over serial!
Replies: 73
Views: 7229

Re: WIFI for all ataris over serial!

Some ideas: ⋅  Double check that the serial level shifter (MAX....) is wired correctly. (Or did you program the ESP via the same level shifter? Then it should be OK.) ⋅  As stated, the firmware will default to 19200 bit/s. Did you set your Falcon's serial port accordingly? PS: 19...
by czietz
Mon Aug 21, 2017 2:32 pm
Forum: Hardware
Topic: 520ST External Floppy only
Replies: 36
Views: 1647

Re: 520ST External Floppy only

Did you check if the side select signal (pin 32) is connected to something else? Then you may have to cut that trace. However -- since I have no first hand experience -- I'm still hoping someone who actually modified that version of the SF354 will come forward.
by czietz
Sat Aug 19, 2017 7:48 pm
Forum: Hardware
Topic: 520ST External Floppy only
Replies: 36
Views: 1647

Re: 520ST External Floppy only

Thank you! I must confess that I don't know the version of the SF354 with the additional circuit that you have. Probably the side select signal is intercepted by the microcontroller on there and it is not passed to the drive -- or in your case the Gotek. Maybe it is as easy as connecting that signal...

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