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Sprinter Version 2016s, Replica 
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Joined: 06 Jan 2022 13:04
Posts: 17
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Hello Sprinter friends,
I still have problems with the CMOS RAM DS12887. Every now and then the CMOS RAM loses the BIOS settings. I tested different types. DS 12887, DS 12887A, DS 12887+, DS 12C887. I built another Sprinter. Again, the same phenomenon?
Anyone have a tip?
Regards


13 Mar 2022 11:17
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Joined: 09 Jan 2003 00:22
Posts: 20330
Location: Silicon Valley
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Yes, sometimes it's reset itself on my Sp2000 - not know why yet
Good thing time is staying
But shift coordinates of the screen are needed to be setup again from time to time

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13 Mar 2022 12:32
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Joined: 06 Jan 2022 13:04
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Shaos, thanks for replay.
I tested a Bechmarq bq32887 CMOS. This one has never forgotten its contents!
I got the DS12887+ new from CN. With 3 pieces the battery was already empty. So here too conversion to external battery.


13 Mar 2022 13:21
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Joined: 06 Jan 2022 13:04
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I have a hint about the problem of data loss in CMOS RAM. Data loss does not occur if Fex Navigator (FN) is exited before power off.
The FN constantly accesses the CMOS (signal play on AS, DS, R/W).
When the FN is terminated, no access to the CMOS can be seen.
The signal play in connection with switching off must probably trigger an erasure process in the RAM.
The problem can also be aggravated by the chip select being permanently on GND.
Does it make sense to change the circuit diagram here?


15 Mar 2022 13:38
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Interesting

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18 Mar 2022 22:14
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Hello Sprinter Fans,
who can help me. I'm looking for the circuit diagram and the PCB assembly for the Sprinter 2022s.
Regards


12 Sep 2022 12:51
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Joined: 06 Jan 2022 13:04
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Here is a picture of my Sprinter 2022s.
Who has a circuit diagram and an assembly plan for this PCB?
Many thanks to all Sprinter fans.
regards
Matthias


Attachment:
File comment: Sprinter 2022s
IMG_7974.jpg
IMG_7974.jpg [ 216.12 KiB | Viewed 164 times ]


13 Sep 2022 12:58
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It looks like update of Sp2021sp board (with 3 ISA slots) - not sure what was added in Sp2022s, but I think it should be minor changes

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13 Sep 2022 23:03
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