what does memtest86+ serial console mean
Two options.
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memtest86+; used for boxes that have a screen attached
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memtest86+ serial console 115200; used for headless boxes that have a serial terminal/console attached; the 115,200 is the speed (115,200 bps) or the fastest old serial connections (think RS232; well before USB) could reliably achieve before needing to modulate-demodulate signal etc