Search found 86 matches

by tzok
Wed Sep 05, 2018 9:33 am
Forum: Hardware
Topic: STE boot grey desktop now changing to green - grey
Replies: 6
Views: 878

Re: STE boot grey desktop now changing to green - grey

Your STe is old and the video signal timing is not stable enough for your modern TV. Thus your PAL decoder in TV goes out-of-sync and TV switches to monochrome mode.
by tzok
Mon Sep 03, 2018 2:40 pm
Forum: Applications
Topic: IKBD RTC clock sync
Replies: 2
Views: 1272

IKBD RTC clock sync

TOS 2.06 synchronizes XBIOS clock with IKBD after each reset, so when you set the clock once in Control Panel, it is still set after reboot, until you won't power off the computer. However in TOS 1.xx it doesn't work. Only on STe with TOS 1.06 and 1.62 you may use STE_FIX.PRG in auto folder to do th...
by tzok
Mon Sep 03, 2018 1:33 pm
Forum: Applications
Topic: Y2K date fix for 2017?
Replies: 12
Views: 4801

Re: Y2K date fix for 2017?

I've discovered some interesting facts about the IKBD clock while working on my pass-through IKBD clock replacement. First of all - IKBD uses a proper BCD (de)coding routines, and thus ignores any half-bytes higher than 9. It may be used to set a time only, without altering a date or vice versa - yo...
by tzok
Sun Sep 02, 2018 4:03 pm
Forum: Hardware
Topic: SF314 models
Replies: 4
Views: 643

Re: SF314 models

I have never seen a belt-driven DS floppy... there were 3 types of SF-314, but much more internal disk drive types. The oldest model had a square eject button, like most PC floppies have, the further model had a "slanted" (rhombus) type wide eject button (like in early STf), and the last o...
by tzok
Sat Aug 11, 2018 8:33 pm
Forum: Hardware
Topic: Atari Mega STe 2 floppy drive Gotek + SMD-340
Replies: 8
Views: 1040

Re: Atari Mega STe 2 floppy drive Gotek + SMD-340

Twisted cable is meant only for PC FDD, as there are two separate MOTOR_ON (MOTEA and MOTEB) signals and two DRIVE_SELECT (DRVSA and DRVSB). So, with twisted cable, both drives are set as DS1, and the twist changes one to DS0. On Atari or plain Shugart there is only one MOTOR_ON shared by all drives...
by tzok
Sat Aug 11, 2018 7:39 pm
Forum: Hardware
Topic: Noob hardware questions
Replies: 22
Views: 2590

Re: Noob hardware questions

To be completely precise Gotek has an ability to emulate a Hard Disk (up to 32MB), but it can't boot from it (so also no AUTO folder), and it locks both floppy drives while using this mode. It also uses the floppy interface to transfer data, so the speed isn't its strong point (it is faster than reg...
by tzok
Fri Aug 10, 2018 6:02 pm
Forum: Hardware
Topic: Self-restarting STf with noisy video
Replies: 1
Views: 391

Re: Self-restarting STf with noisy video

Quick update as a self response: - it doesn't any more self-reboots, but it wasn't its only issue. The reason for restarts, probably was a bad contact/bent pin in MMU socket. - The HIGH mode is still noisy and very prone to Vcc fluctuations and noise (changing Vcc by 0.05V shifts the screen left or ...
by tzok
Fri Aug 10, 2018 9:23 am
Forum: HxC Floppy Emulator
Topic: HxC External floppy cable, works as A and B
Replies: 40
Views: 21915

Re: HxC External floppy cable, works as A and B

On most STf and all STe there are jumpers on board to route the DS0 and DS1 signals to appropriate pins of external FDD connector. You mas use them, together with a DSx jumpers on the internal FDD.

I've described it here: viewtopic.php?f=15&t=32863
by tzok
Fri Aug 10, 2018 8:50 am
Forum: Hardware
Topic: Self-restarting STf with noisy video
Replies: 1
Views: 391

Self-restarting STf with noisy video

Iv'e bought an 1040STf for parts, but finally I've decided to try to repair it. This is an early 1040STf with a RED leds and TOS 1.0 GB. Initially it was starting out-of-sync on ST-mono monitor (actually VGA with adapter). I've removed all the chips from their sockets, cleaned them with contact clea...
by tzok
Sat Jul 21, 2018 10:35 pm
Forum: Professionals
Topic: - My "New" Atari TT and Upgrades -
Replies: 69
Views: 13838

Re: - My "New" Atari TT and Upgrades -

The terminating resistors are a standard SIP resistor packs type 4308R-104-221/331 (BOURNS).
by tzok
Mon Jun 18, 2018 7:16 pm
Forum: Hardware
Topic: Atari 520STFM joystick port fault
Replies: 7
Views: 1931

Re: Atari 520STFM joystick port fault

Typical issue for the STf/e keyboards. Resoldering ports should do the job. Just use good flux, and leaded solder.
by tzok
Tue Jun 12, 2018 5:41 pm
Forum: Hardware
Topic: Recapping an ST board - is it worth?
Replies: 10
Views: 3041

Re: Recapping an ST board - is it worth?

I've actually checked not only the capacity of de-soldered caps, but also ESR and leakage current. For the tested units, they were all well in specs. Actually their ESR was better than some brand new generic Chinese LowESR 105*C rated equivalents.
by tzok
Sun Jun 10, 2018 10:19 am
Forum: Hardware
Topic: 6 chip TOS
Replies: 11
Views: 2687

Re: 6 chip TOS

The L/H mix has to do with word notation in variuos CPU... MC68000 is a big endian CPU, and thus the byte order is swapped (more significant byte first). This is only a byte order in the word, bits in bytes are in usual order for either architecture. So when preparing a Lo part of the TOS image you ...
by tzok
Sat Jun 09, 2018 8:53 am
Forum: Hardware
Topic: Recapping an ST board - is it worth?
Replies: 10
Views: 3041

Recapping an ST board - is it worth?

Have you ever found an faulty electrolytic capacitor on the ST board? I haven't - either on the board, nor on the PSU. According to my experience these WANG'S CAPs were high quality, and all still, after 30 years, are up to their specs.

What is your experience in this matter?
by tzok
Sat May 05, 2018 7:44 pm
Forum: Hardware
Topic: SF314 PSU dead - repair or replace?
Replies: 2
Views: 1179

Re: SF314 PSU dead - repair or replace?

I wouldn't throw out the PSU as they are pretty rare now. It is definitely repairable, only challenge is to open the case without much damage. Of course you can use any 5/12 volt DC adapter eg. from 3,5" USB HDD case. I'd also buy a new DIN plug instead of cutting and re-using original one (to ...
by tzok
Tue Apr 24, 2018 8:36 pm
Forum: Applications
Topic: Unknown TOS
Replies: 12
Views: 6627

Re: Unknown TOS

Recently I had a 520ST with this TOS... it would be great to make a collection of such custom TOSes.
by tzok
Thu Apr 19, 2018 12:15 pm
Forum: Hardware
Topic: Atari ST floppy drives and their limitations
Replies: 6
Views: 3136

Re: Atari ST floppy drives and their limitations

So far I've checked the following:
EPSON SMD-380: 84 tracks,
CHINON FB-354AA: 84 tracks,
NEWTRONICS D357: 84 tracks,
SONY MP-F11W-U0: 82 tracks.

Is there any list of FDDs used in the ST computers?
by tzok
Sun Apr 01, 2018 4:37 pm
Forum: Hardware
Topic: Atari 520 ST not reorganize floppy drive
Replies: 7
Views: 2391

Re: Atari 520 ST not reorganize floppy drive

There were a lot of DE TOS 520STs in Germany and in Poland and they were working... so it is not the reason. Does the floppy motor star when you try to access the A:? Is the FDD LED lit?
by tzok
Tue Mar 27, 2018 9:50 pm
Forum: Hardware
Topic: GOTEK in SF314 floppy drive?
Replies: 6
Views: 2194

Re: GOTEK in SF314 floppy drive?

But with SF-354 you have to get rid of the original PCB, or at least re-route some signals on it. Anyways on SF-314 the original ribbon and power cables are also too short.
by tzok
Tue Mar 27, 2018 9:47 pm
Forum: Hardware
Topic: SF314 repair
Replies: 2
Views: 1275

Re: SF314 repair

Floppy should work without these.
by tzok
Thu Mar 15, 2018 5:28 pm
Forum: Hardware
Topic: GOTEK in SF314 floppy drive?
Replies: 6
Views: 2194

Re: GOTEK in SF314 floppy drive?

The slot in SF314 is enough for Gotek, you don't need to cut anything. You have to use spacers to mount the Gotek, because the original FDD (at least in version with "slanted"/wide eject button) is 1,5x higher than Gotek. It would fit like so: https://obrazki.elektroda.pl/9780746400_152113...
by tzok
Thu Mar 08, 2018 7:48 pm
Forum: Hardware
Topic: Atari ST floppy drives and their limitations
Replies: 6
Views: 3136

Re: Atari ST floppy drives and their limitations

Yes, but have anyone tested floppy drives used in various Atari ST, for how many tracks they support? After all, I think that each Epson SMD-380 will do 84 tracks.
by tzok
Mon Mar 05, 2018 9:23 pm
Forum: Hardware
Topic: Atari ST floppy drives and their limitations
Replies: 6
Views: 3136

Atari ST floppy drives and their limitations

I've recently bought an SONY MP-F11W-U0 floppy disk drive in an unknown condition for a good price (~12€). It looked almost brand new, but had difficulties in reading and writing disks, especially 11 sector/track. I have cleaned it, and replaced two electrolytic capacitors: on +5V rail (47uF/6.3V) a...
by tzok
Sat Mar 03, 2018 10:01 pm
Forum: Hardware
Topic: Drive swap on STe without cutting pins/tracks
Replies: 3
Views: 1506

Re: Drive swap on STe without cutting pins/tracks

Same option is available in the STf - the jumper is marked W2, and the positions are: 2-3 = DS1->PIN5, 1-2 = DS0->PIN5.

P.S.
Currently my Gotek/HxC looks like this:
Image
by tzok
Sat Mar 03, 2018 9:55 pm
Forum: Hardware
Topic: 2 floppy drive at once ?
Replies: 13
Views: 2843

Re: 2 floppy drive at once ?

I hate the idea of cutting a good ST case. I'm not against modding, but it should be invisible and reversible. The DS1 signal in STf is also available internally, on the W2 jumper block. I'd accept replacing the fixed FDD cable with a goldpin header and a regular FDD ribbon cable (1:1), but every ST...

Go to advanced search