Search found 153 matches

by tzok
Sun Oct 13, 2019 9:42 am
Forum: HARDWARE ISSUES
Topic: PSU capacitor leakage
Replies: 6
Views: 818

Re: PSU capacitor leakage

Electrolytic capacitors seem to be ok, this is definitely not a leak, this is a glue, that holds them in place. Source of a smoke was this 0,1uF X2 film (MPF) capacitor on the primary side.
by tzok
Fri Oct 11, 2019 9:26 pm
Forum: HARDWARE ISSUES
Topic: Atari still crashing after power supply recap.
Replies: 47
Views: 4946

Re: Atari still crashing after power supply recap.

As I can see, this is a 120VAC (USA) PSU, so 200V cap is just fine.
by tzok
Tue Oct 08, 2019 11:18 am
Forum: CHAT FORUM
Topic: ST314 drive replacement.
Replies: 19
Views: 1132

Re: ST314 drive replacement.

Motor ON is common for all floppies, and regardless which one is selected, motor starts in all, this is normal behavior. In the standard SF314, the DS1 line from Atari STf is connected to the DS0 pin in the drive, so the drive itself has to be set for DRIVE0. In short ST, there are both lines presen...
by tzok
Sun Oct 06, 2019 3:56 pm
Forum: CHAT FORUM
Topic: ST314 drive replacement.
Replies: 19
Views: 1132

Re: ST314 drive replacement.

...but it is apparently wrong (or at least incomplete) ;)

Instead of trying to fine a working pinout, just use DIN pinout and a multimeter to create a signal map for this 14 pin Chinon connector.
by tzok
Sun Oct 06, 2019 3:46 pm
Forum: CHAT FORUM
Topic: ST314 drive replacement.
Replies: 19
Views: 1132

Re: ST314 drive replacement.

I meant - use the DIN connector pinout to map the wires in Chinnon connector to the appropriate signals, and then rewire them for a Shugart connector. Remember about the differences between PC Floppy and the Shugart standard (namely Motor ON and Drive Select lines). 1 - n.c. 2 - n.c. 3 - GND 4 - Hea...
by tzok
Sun Oct 06, 2019 3:36 pm
Forum: CHAT FORUM
Topic: ST314 drive replacement.
Replies: 19
Views: 1132

Re: ST314 drive replacement.

Just use the Atari 14-pin drive pinout and map these pins accordingly. You may also check if pin 3 is ground, then it is likely to be 1:1 to Atari FDD DIN connector pinout. https://obrazki.elektroda.pl/1407143800_1570372883_thumb.jpg 1 - Read Data 2 - Side Select 3 - GND 4 - Index 5 - Drive Select 0...
by tzok
Sat Oct 05, 2019 1:07 pm
Forum: ROM UPGRADES
Topic: 2.06 tos doesnt' fit
Replies: 11
Views: 1139

Re: 2.06 tos doesnt' fit

All 1Mb EPROMs are too long, but that is not a problem, you'll easily find a wire wrap method to put them in. For 2 EPROMs you need just 47LS11, but to have TOS 2.06 (or 1.62) you need some additional address decoding logic (a GAL or a bunch of TTLs). If you want to reverse from 2 ROM to 6 ROM you j...
by tzok
Fri Sep 27, 2019 10:44 pm
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 11434

Re: no-software internal RTC

Update.
I was apparently wrong with 2027 as being the last possible to set date. It is 7 bytes in TOS, but 7 bytes from 1980, not from 1900. So the limit is F9 for pseudo-BCD year, which gives 2059. I have verified it in practice.
by tzok
Fri Sep 20, 2019 8:40 pm
Forum: HARDWARE ISSUES
Topic: Damage done to my STE
Replies: 50
Views: 4330

Re: Damage done to my STE

HxC is older than FF, I I find it more compatible. It is also a paid software, but if you have a HxC bootloader, you can (and should) update to the current version. FF emulates HxC, and uses it's manager (autoboot.hfe), so it is not different from it in usage. Only difference is HxC uses binary conf...
by tzok
Mon Sep 02, 2019 7:32 pm
Forum: CHAT FORUM
Topic: Spare STe board.
Replies: 5
Views: 761

Re: Spare STe board.

Atari keyboard in fact is a stand alone microcomputer which communicates with Atari over the serial link. The communication protocol is documented, as well as the source code (ASM) for the keyboard microcontroller are available. My IKBD RTC module intercepts the communication between ST and IKBD, an...

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