dongfeng
Veteran Member
I have noticed that one of my XT's takes longer to boot than the other. The actual counting of the memory is noticeably slower.
The fastest XT has 640kB on the motherboard and the second (Jan 86) BIOS.
The slower one also has the 256-640 motherboard, but the total memory is only 256kB (four banks of 64kB chips). The rest is on an expansion card. For some reason this system has the first XT BIOS.
The memory in both of the XT's is rated at 15ns.
Why is this? Is it due to the second machine having the expansion card? But the memory counting is still the same speed even with the expansion card removed.
It doesn't bother me, but I am quite curious to know why! I could understand if the machines had different speeds of memory, but they don't.
Both the motherboards were made in 1986.
Could it be the earlier BIOS is slower?
The fastest XT has 640kB on the motherboard and the second (Jan 86) BIOS.
The slower one also has the 256-640 motherboard, but the total memory is only 256kB (four banks of 64kB chips). The rest is on an expansion card. For some reason this system has the first XT BIOS.
The memory in both of the XT's is rated at 15ns.
Why is this? Is it due to the second machine having the expansion card? But the memory counting is still the same speed even with the expansion card removed.
It doesn't bother me, but I am quite curious to know why! I could understand if the machines had different speeds of memory, but they don't.
Both the motherboards were made in 1986.
Could it be the earlier BIOS is slower?