Search found 150 matches

by tzok
Sat Sep 07, 2019 10:03 am
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 188
Views: 44866

Re: STe - Bad DMA Chip

Have anyone read this: We received trouble reports from a few STe's used in combination with a hard drive. The problem that arose was the mutilation of data, directories or the presence of faulty sectors during the work. These effects result from the fact that some brands of SIMM's can influence the...
by tzok
Thu Sep 05, 2019 10:15 am
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1286

UltraSatan clears SD card on Atari power off

Like in the topic, whenever I turn off my STe and there is a SD card in the UltraSatan slot, the card is blank. Activity LED turns on on UltraSatan for a few seconds immediately after powering off the Atari, and I know that card is clear at this moment. Afterwards some cards have just 0x00, others h...
by tzok
Wed Sep 04, 2019 7:48 am
Forum: Hardware
Topic: Netusbee by Lotharek, plugin orientation?
Replies: 7
Views: 749

Re: Netusbee by Lotharek, plugin orientation?

When ST sits on a table you really can't plug it in any other way... it also has rubber feet on the bottom.
by tzok
Wed Aug 28, 2019 1:54 pm
Forum: Hardware
Topic: NetUSBee USB drivers download
Replies: 89
Views: 18664

Re: NetUSBee USB drivers download

I use BIGDOS to access bigger flash drives, it has to be loaded before netusbee drivers. I don't think usbtool is able initialize mouse, if it was not recognized during boot. I guess the problem is the voltage on USB port of the netusbee.
by tzok
Wed Aug 28, 2019 1:43 pm
Forum: Hardware
Topic: Frustrating Display Issue 520ST
Replies: 2
Views: 412

Re: Frustrating Display Issue 520ST

My STfm sometimes starts normal, sometimes like this... but I can't help you more.
by tzok
Wed Aug 21, 2019 3:21 pm
Forum: Hardware
Topic: Non-working Mouse/Joy buttons on 520STF keyboard
Replies: 5
Views: 667

Re: Non-working Mouse/Joy buttons on 520STF keyboard

Most USB mouse adapters ignore the fact, that in the Atari ST the right mouse button is hardwired with the joystick 1 fire button. Becouse of this, both the fire button, and mouse buttons signals must be of open collector type. There are pull-up resistors on these lines. None of these lines can have...
by tzok
Mon Aug 19, 2019 9:32 am
Forum: Other emulators & tools
Topic: Gotek Vs. HD 1.44 images
Replies: 3
Views: 1981

Re: Gotek Vs. HD 1.44 images

You can create a special HFE images for DSDD drives, up to 3,42MB using a HxC Floppy Emulator Software.
by tzok
Sat Aug 17, 2019 3:17 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 188
Views: 44866

Re: STe - Bad DMA Chip

This demo was working fine on my STe with HC CPU. I've got a slightly older M/B revision (CA4003290), with 2 small ICs under SIMM slots, and a 3rd IC mounted as a "backpack" on one of the existing.
by tzok
Mon Aug 05, 2019 6:07 pm
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 1658

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

siriushardware wrote:I wonder if there are some variants of ST (where the Hsync and Vsync may come directly from TTL-level IC outputs) where the Hsync and Vsync outputs may not be able to drive loads as low as 75R.
Actually these serial resistors are present only in STe, in ST/f/fm H/VSync are driven directly.
by tzok
Sun Aug 04, 2019 4:20 pm
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 1658

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

In STe the HSync & VSync also have a 33R series resistor. Whats more, the diode introduces further voltage drop out. It should be Shottky diode to ensure minimal voltage drop. 1N4148 is not ideal (won't work with my STe & Sony TV).
by tzok
Sat Aug 03, 2019 10:33 am
Forum: Hardware
Topic: PSU restoring; Recapping all my Atari PSUs
Replies: 9
Views: 1291

Re: PSU restoring; 12v rail too low!

However, considering that the 12 V rail isn't used by much in the ST (older floppy drives, serial port, possibly modulator), I wouldn't worry too much. Nope, STf/fm/e use 12V solely for the FDD motor drive (and even not all units, newer units with Sony FDD don't use it at all). It is only present (...
by tzok
Sat Aug 03, 2019 10:26 am
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 2199

Re: 1040STfm boot failure -> white screen/stripes [solved]

On some TV sets it won't work, whatever you'd done... you may try to use voltage divider and use signal from pin 8 (12V) instead of rectifying the VSync, but it has very low output current.
by tzok
Tue Jul 30, 2019 1:43 pm
Forum: Hardware
Topic: 520 ST+ anyone know what this mod is?
Replies: 4
Views: 921

Re: 520 ST+ anyone know what this mod is?

On the 1st photo there is an battery backed-up RTC. The blue thing is a Ni-Cd battery, probably needing a replacement, then there is an original TOS EPROM (1 of 6), some generic logic chips, a GAL, and a RTC 58321A (by Seiko). On the remaining photos there is a factory installed 512kB RAM expansion ...
by tzok
Mon Jul 22, 2019 5:43 am
Forum: Hardware
Topic: Atari STFM dead
Replies: 3
Views: 630

Re: Atari STFM dead

12V is only for floppy, STf itself will run fine just on 5V.
by tzok
Mon Jul 15, 2019 9:55 am
Forum: Hardware
Topic: ST TOS ROMs - what is the speed of stock ROMs
Replies: 16
Views: 2320

Re: ST TOS ROMs - what is the speed of stock ROMs

Ok, so on stock ST, I'm "completely safe" using 200ns EPROMs. Thank you!
by tzok
Fri Jul 12, 2019 11:53 am
Forum: Hardware
Topic: Loading multiple images from GoTek FlashFloppy help please
Replies: 4
Views: 1067

Re: Loading multiple images from GoTek FlashFloppy help please

You may fill all the 999 slots with images (no need to boot to the first selected image right away), and then switch them by buttons on the Gotek drive. There is no other way to exit the image loader than reset. Most games are self booting disks, so it would be pointless anyway. You may attach a dis...
by tzok
Fri Jul 05, 2019 6:26 pm
Forum: Hardware
Topic: Loading multiple images from GoTek FlashFloppy help please
Replies: 4
Views: 1067

Re: Loading multiple images from GoTek FlashFloppy help please

You can use up to 999 slots in HxC Manager, you boot to HxC Manager, assign images to slots, and reboot at first image, then you may switch between these slots at any time using Up/Down buttons on the Gotek drive.
by tzok
Wed Jul 03, 2019 6:35 pm
Forum: Hardware
Topic: IKBD-to-USB?
Replies: 48
Views: 6871

Re: IKBD-to-USB?

TOS 2.xx additionally initializes the ST real time clock from IKBD clock, so there is additional query after the reset. Same with TOS 1.06/1.62 and STE_FIX.PRG AutoLoaded and older TOSes and CONTROL.ACC loaded. Having this board in your ST, you may easily add a real time clock functionality. Please ...
by tzok
Thu Jun 27, 2019 6:42 pm
Forum: Hardware
Topic: ST TOS ROMs - what is the speed of stock ROMs
Replies: 16
Views: 2320

ST TOS ROMs - what is the speed of stock ROMs

Does anyone knows how fast are stock Mask ROMs used in ST? 1 clock cycle in 8MHz ST is about 125ns, so ROMs should be 120ns or faster, but I have used 6x27C256-20 and 2x27C1000-20 EPROMs (in two different STs), both 200ns, which seem to work. So is there a Wait State when accessing ROMs?
by tzok
Thu Jun 27, 2019 7:25 am
Forum: Applications
Topic: .App extension < How to use?
Replies: 12
Views: 4702

Re: .App extension < How to use?

Isn't .APP just a regular GEM Application? Same as .PRG, but for TOS 2.x?

UPDATE:
...yes - it is an alias of PRG, here's the proof from a "stock" newdesk.inf:
#G 03 FF 000 *.APP@ @ @
#G 03 FF 000 *.PRG@ @ @
by tzok
Fri Jun 07, 2019 8:55 am
Forum: Hardware
Topic: Converting ST mouse to USB?
Replies: 4
Views: 1122

Re: Converting ST mouse to USB?

Forget about DigitalRead(), it is far too slow for encoder. Before you start coding you have to understand how the mouse works... you distinguish directions on a base of the phase shift between +X/-X pulses. Of course these are "digital" (square wave) signals. Buttons shouldn't be problem,...
by tzok
Thu May 30, 2019 4:40 pm
Forum: Hardware
Topic: How can I split a ROM file?
Replies: 3
Views: 1405

Re: How can I split a ROM file?

I've made a Windows PC utility for manipulation on ROM images. I've called it a "CartMan". Here it is (with the source in C#):
https://github.com/TzOk83/CartMan
by tzok
Wed May 08, 2019 5:31 pm
Forum: Hardware
Topic: Drive swap on STe without cutting pins/tracks
Replies: 25
Views: 5017

Re: Drive swap on STe without cutting pins/tracks

> This still does not prevent the internal drive from receiving the D0sel when I want to use the external drive as D0sel Of course not, but when the internal drive is set do D1 (by its jumpers) it doesn't care about D0SEL signal. I also use GOTEK as internal drive. DnSEL signal for drive is only a D...
by tzok
Tue May 07, 2019 8:00 pm
Forum: Hardware
Topic: Drive swap on STe without cutting pins/tracks
Replies: 25
Views: 5017

Re: Drive swap on STe without cutting pins/tracks

If the Gotek is installed as internal drive, and there is no external drive configured as drive 0, it has to be set at ID0. Also please notice the location of pin1 on Gotek. Everything is explained in my first post in this topic, please read it carefully. Gotek is no different than a regular FDD. Th...
by tzok
Fri May 03, 2019 6:25 pm
Forum: Hardware
Topic: Drive swap on STe without cutting pins/tracks
Replies: 25
Views: 5017

Re: Drive swap on STe without cutting pins/tracks

The internal drive gets both D0 and D1, I assume thats so you can copy from Floppy A to Floppy B by swapping disks.. No, disk swapping in single drive machines is done completely by software, DS1 is never active there. According to the Shugart standard there are 4 drive select lines routed to all d...

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