rorypoole
Veteran Member
I want to replace the 8250 UART in my IBM XT with a 16550A but the original 8250 UART had several bugs so the original IBM BIOS includes code to work around these flaws, but this made the BIOS dependent on the flaws being present so subsequent parts like the 8250A, 16450 or the faster 16550A 16550D could not be used in to upgrade the original 8250 in the IBM PC or IBM PC/XT.
So any information on the BIOS pach used in the IBM XT would be very usefull to me.
So any information on the BIOS pach used in the IBM XT would be very usefull to me.
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