According to any user, Maximum RAM is available to 736KB on IBM PC 5150 motherboard.
SW2 should be set as follows.
(BIOS should be 10/27/82)
1 - OFF / 2 - ON / 3 - OFF / 4 - ON / 5 - OFF
This SW2 setting can't be found on this URL
http://www.minuszerodegrees.net/5150/ram/5150_ram_64_256_SW2.jpg
I use MicroRAM (1MB)
https://www.ebay.com/itm/MicroRAM-640K-UMB-RAM-8-bit-ISA/333218465129
SW2 should be set as follows.
(BIOS should be 10/27/82)
1 - OFF / 2 - ON / 3 - OFF / 4 - ON / 5 - OFF
This SW2 setting can't be found on this URL
http://www.minuszerodegrees.net/5150/ram/5150_ram_64_256_SW2.jpg
I use MicroRAM (1MB)
https://www.ebay.com/itm/MicroRAM-640K-UMB-RAM-8-bit-ISA/333218465129
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