Timeline for Charging 1S 850 mah battery at low current, 4.2 volts max, potential issues
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Mar 28, 2020 at 19:33 | comment | added | rcgldr | The 6301 treats year "00" (2000) as a leap year so no date issues there. It wraps from yy|mm|dd hh:mm:ss of 79|12|31 23:59:59 to 80|01|01 00:00:00 and from 99|12|31 23:59:59 to 00|01|01 00:00:00, so no year issue on midnight wrap to 00:00:00. | |
| Mar 28, 2020 at 19:22 | comment | added | rcgldr | I'm afraid to pull it out, it's a 35 year old system. I'll have to look around to see if I have a tool that can safely pull it out so the pins don't get bent on removal or insertion. Link to zip of date and time program (and source code), that you can put in boot floppy AUTO folder JDTTM.ZIP, or rename or copy JDTTM.PRG to JDTTM.TOS to run directly. This uses BIOS calls to write directly to 6301, and corrects for BIOS error for get / set keyboard time. It works for all years: 1980 to 2079. (6301 stores year as 2 BCD digits in a byte). | |
| Mar 28, 2020 at 19:07 | comment | added | Bruce Abbott | That's the image I found! (should have looked the url and then I would have known it was yours). Any chance of seeing the bottom of the board? | |
| Mar 28, 2020 at 19:06 | comment | added | rcgldr | Link to the circuit diagram for a battery backup circuit. It's somewhat different than the "time-saver" circuit board. | |
| Mar 28, 2020 at 18:56 | comment | added | rcgldr | Image of the board time-saver. Red and black wires to go battery pack. The 40 pin 6301 is removed from the 40 pin keyboard socket and the circuit board plugs into the 40 pin keyboard socket, and the 6301 is plugged into a 40 pin socket on the circuit board. At AtariAge forums, someone posted their own circuit, but it is different than the board shown. The key issue is using diodes to prevent battery power going beyond circuit board to rest of keyboard. I got the Atari ST with the circuit board and 1MB ram upgrade as part of dev kit in 1985. | |
| Mar 28, 2020 at 17:19 | comment | added | Bruce Abbott | Running the 6301 24/7 won't hurt it. Having the 3 cell NiMH charged to 4.5V shouldn't be an issue either. I wish I could be more specific but I know very little about your board. Do you know where I can find a schematic, pictures, or any other information about it? If I ever get an ST myself I might want to reproduce it. | |
| Mar 28, 2020 at 15:50 | comment | added | rcgldr | Thanks for the info. I was looking for pros and cons of using the LiPo instead of NiMH, since this came up in an Atari forum. One concern is that a 3 x AA NiMH can temporarily be charged to 4.5 volts, but should drop down to 4.2 volts after a few days (maybe just one). As for myself, I'm more concerned about running the 6301 clock (also keyboard) chip 24/7, so other than testing, I leave the battery disconnected. This just means I have to enter date and time once per power up. | |
| Mar 28, 2020 at 8:46 | vote | accept | rcgldr | ||
| Mar 28, 2020 at 5:52 | history | answered | Bruce Abbott | CC BY-SA 4.0 |
