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286 RAM parity error

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First post, by Old PC Hunter

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I just bought 4x1 MB 3 chip 60 ns 30 pin SIMM's for my 286 PC. I can't get them to work properly, however. When I turn on the PC with the RAM installed, I get the errors shown in the pictures below. There are no memory configuration jumpers on the mainboard or memory config settings in BIOS. When I power it on with this memory, it dosent let me access setup due to the POST check not finishing. I have tried switching banks and only putting in 2 sticks at a time in both bank 1 and 0. All the RAM is counted and recognized. The sticks that came out of here before were 2x256k 3 chip SIMM modules plus 2x64k 3 chip SIMM modules. If anyone has a possible solution to my problem, please let me know here.

Thanks

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Set up retro boxes:
DOS:286 10 MHZ/ET4000AX1MB/270 MB HDD/4 MB RAM/Adlib/80287 XL
W98:P2 450/Radeon 7000 64 MB/23 GB HDD/SB 16 clone/384 MB RAM
XP:ATHLON X2 6000+/2 GB RAM/Radeon X1900XTX/2x120 GB SSD/1x160 GB and 1x250 GB 7.2k HDD's/ECS A740 GM-M/SB X-Fi

Reply 1 of 5, by Horun

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Put the original ram back in and check the BIOS for a mem parity setting and disable then try the new ram again. In my experience have had bad luck with any 3 chip 30pin simm above 256k in size on any 286 or slower/older 386. The 9 chip 1Mb and 4Mb seem to always work fine though.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 2 of 5, by Old PC Hunter

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There is no parity setting in the BIOS. I already checked.

Set up retro boxes:
DOS:286 10 MHZ/ET4000AX1MB/270 MB HDD/4 MB RAM/Adlib/80287 XL
W98:P2 450/Radeon 7000 64 MB/23 GB HDD/SB 16 clone/384 MB RAM
XP:ATHLON X2 6000+/2 GB RAM/Radeon X1900XTX/2x120 GB SSD/1x160 GB and 1x250 GB 7.2k HDD's/ECS A740 GM-M/SB X-Fi

Reply 4 of 5, by Old PC Hunter

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There is no jumper for parity. Aren't 3 chip SIMMs and 9 chip SIMMs parity?

Set up retro boxes:
DOS:286 10 MHZ/ET4000AX1MB/270 MB HDD/4 MB RAM/Adlib/80287 XL
W98:P2 450/Radeon 7000 64 MB/23 GB HDD/SB 16 clone/384 MB RAM
XP:ATHLON X2 6000+/2 GB RAM/Radeon X1900XTX/2x120 GB SSD/1x160 GB and 1x250 GB 7.2k HDD's/ECS A740 GM-M/SB X-Fi

Reply 5 of 5, by maxtherabbit

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Old PC Hunter wrote:

There is no jumper for parity. Aren't 3 chip SIMMs and 9 chip SIMMs parity?

yes, but 3 chip SIMMs usually do not work with 286 and early 386sx motherboards because of the different refresh timing requirements

you probably need to use 9 chip SIMMs

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