Search found 148 matches

by tzok
Sun Sep 29, 2019 9:06 am
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

Which software you are talking about?
by tzok
Fri Sep 27, 2019 9:09 pm
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

There is a quite a long topic about my investigation and a hardware clock:
https://www.exxoshost.co.uk/forum/viewt ... f=10&t=544

...and I was wrong, the limit is 2059 (year "F9" in pseudo-BCD, so 1900 + 159), not 2027 (1900 + 127, because it is 1980 + 127).
by tzok
Fri Sep 27, 2019 7:45 am
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

neanderthal wrote:aint the file year in Gemdos same as standard Dos(and other systems) 1980 as year 0..And then 7bit +offset from that.
From what I remember in GEMDOS - yes (0 = 1980), but in XBIOS - not (0 = 1900).
by tzok
Thu Sep 26, 2019 11:45 am
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 188
Views: 43313

Re: STe - Bad DMA Chip

On my HC STe We Were @ works ok, however it displays some garbage on the left border in the full screen distorter, same with {closure}: https://obrazki.elektroda.pl/8226079300_1569498203_thumb.jpg On the other hand, the Atari ST 32768 Colour Showdown seems to work just fine: https://obrazki.elektrod...
by tzok
Thu Sep 26, 2019 9:16 am
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

DeskCart! probably not, because DeskCart! is not using IKBD, it is a cartridge, and uses a different protocol. I've made my own IKBD filter/injector device using Arduino Nano to intercept IKBD date/time calls and substitute them by own generated ones. So my Atari thinks it is "talking" wit...
by tzok
Thu Sep 26, 2019 9:11 am
Forum: Hardware
Topic: External hard drive with ICD software only boots on reset
Replies: 6
Views: 318

Re: External hard drive with ICD software only boots on reset

Actually the Atari bulletin was recommending to change a capacitor and resistor in the reset circuit of the Megafile, but here is the FIX for you:
https://www.exxoshost.co.uk/forum/viewt ... =17&t=2175
by tzok
Wed Sep 25, 2019 5:47 pm
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

The hint is, that in this 2-digit year formally is BCD, but in reality each digit can be HEX ;) so B9 is a valid year 119 (11 * 10 + 9 * 1), and the internal conversion formula would produce 1900 + 119 = 2019. The old Atari control panel (control.acc) is aware of this, and if you type in year "...
by tzok
Wed Sep 25, 2019 10:25 am
Forum: Hardware
Topic: Having problems with an external floppy drive
Replies: 1
Views: 1052

Re: Having problems with an external floppy drive

You should swap just the Drive ID line and not any other. It is the Shugart interface, not PC FDD.
by tzok
Wed Sep 25, 2019 10:24 am
Forum: Hardware
Topic: Help Forget Me Clock
Replies: 24
Views: 2626

Re: Help Forget Me Clock

I may only mention that TOS is Y2K compatible to some extent... it will accept 2000's until 2027. Even through XBIOS and/or IKBD serial link (serial injector). Only the IKBD firmware is completely not Y2K aware. There are also some patches that roll the year forward by 30 years or that modify the wa...
by tzok
Wed Sep 25, 2019 8:58 am
Forum: Hardware
Topic: External hard drive with ICD software only boots on reset
Replies: 6
Views: 318

Re: External hard drive with ICD software only boots on reset

Is this ST or STe? STe had some issue with the Power On Reset. You were supposed to change some capacitor on the motherboard to fix this problem. If you really have the STe I will look for more details.
by tzok
Mon Sep 23, 2019 5:02 pm
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

siriushardware wrote:I assume you meant SN74LS245NC :)
Your assumption was correct ;) I have corrected that.
by tzok
Mon Sep 23, 2019 1:41 pm
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 188
Views: 43313

Re: STe - Bad DMA Chip

Yes, I was referring exactly to this bulletin - capacitor between CPU pins 2 and 4 has no sense, original Atari bulletin mentions pins 13 and 16, and these do have sense.
by tzok
Sun Sep 22, 2019 8:17 pm
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

My STe stopped destroying FAT on floppies long time ago, after replacing CPU with a HC version and Mask ROMs with Flash. Original buffers were GD74LS244 (Goldstar) and 74LS245N (Signetics). I have replaced them with HD74LS244P (Hitachi) and SN74LS245NC (Texas Instruments). Both removed ICs test OK o...
by tzok
Fri Sep 20, 2019 9:09 am
Forum: Hardware
Topic: STE repair
Replies: 22
Views: 940

Re: STE repair

Jumpers are needed because ~OE, A15 and A16 on ROMs have different locations depending on used chips (Mask ROM/27C1000/27C010). ~OE is hard wired to GND, and two most significant address lines are connected respectively to the Atari A16 and A17 address bus lines (as Atari address bus starts at A1, w...
by tzok
Thu Sep 19, 2019 9:09 pm
Forum: Hardware
Topic: STE repair
Replies: 22
Views: 940

Re: STE repair

Bikerbob wrote:Thanks but what do these points refer to?
To the Address Bus lines A16 & A17 on MC68000.
by tzok
Thu Sep 19, 2019 2:00 pm
Forum: Hardware
Topic: STE repair
Replies: 22
Views: 940

Re: STE repair

Your "e-pads" are configuration jumpers. They could be read at some I/O address. I think only one of them has any use of all, and is used to inform TOS 2.x that the machine is equipped with a HD floppy.
by tzok
Sun Sep 15, 2019 9:58 am
Forum: Hardware
Topic: Overheating chip on Atari STE plugged into socket U405--is it normal?
Replies: 10
Views: 979

Re: Overheating chip on Atari STE plugged into socket U405--is it normal?

Oh yes, I missed that. Pin 4 is mono detection and is left floating. As for pull-ups I believe it is a design flaw, and despite of chip version being used, there should be a pull-up resistors on both monitor input pins (3 & 4). It is not recommended to leave input pins floating. BTW this is a ge...
by tzok
Sat Sep 14, 2019 7:10 pm
Forum: Hardware
Topic: Overheating chip on Atari STE plugged into socket U405--is it normal?
Replies: 10
Views: 979

Re: Overheating chip on Atari STE plugged into socket U405--is it normal?

It is better to fit there a 74F254. Mono detection already has a 4k7 pull-up (R472).
by tzok
Fri Sep 13, 2019 12:02 pm
Forum: Hardware
Topic: Diode choice
Replies: 3
Views: 351

Re: Diode choice

Try with BAT42 or BAT43, these are true Shottky diodes, while all your propositions are small signal switching silicon epitaxial planar diodes. https://www.vishay.com/docs/85660/bat42.pdf https://www.vishay.com/docs/81857/1n4148.pdf https://www.vishay.com/docs/85523/1n4151.pdf https://www.vishay.com...
by tzok
Fri Sep 13, 2019 11:43 am
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

The ultimate solution of the problem was replacing the ACSI bus buffers (U302 & U307).

Strangely on the old buffers there were no problem with the Megafile 60 nor with the ACSI-CF adapter (both ACSI #0).
by tzok
Sun Sep 08, 2019 3:33 pm
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

Card works just fine after reformatting. What is even more interesting - I've changed ACSI ID of USatan from 0, 1 to 1, 2 and the card is no longer erased. On ACSI 0, keeping reset button pressed during powering off also helps. Don't know if it is normal, but I can't boot to TOS 2.06 without a card ...
by tzok
Sun Sep 08, 2019 10:15 am
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

After replacing MC68000 with MC68HC000 I no longer experience any "bad DMA" symptoms. This issue doesn't seem to be directly connected with a "bad DMA". The card is cleared not corrupted, and only at Atari power-off, never on reset or read/write access.
by tzok
Sat Sep 07, 2019 9:15 pm
Forum: Hardware
Topic: UltraSatan clears SD card on Atari power off
Replies: 13
Views: 1097

Re: UltraSatan clears SD card on Atari power off

If I could get a "good DMA" I'd certainly replaced it. But as the card doesn't get corrupted, but completely deleted it doesn't seem to be DMA problem. It only happens after powering off the Atari, never on reset. I've tried both CMOS (HC) and NMOS CPUs, I've added 4k7 pull-ups to the DMA ...
by tzok
Sat Sep 07, 2019 10:03 am
Forum: Hardware
Topic: STe - Bad DMA Chip
Replies: 188
Views: 43313

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: 1097

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...

Go to advanced search