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+--- Thread: Question re 0x40-0x4F CF controller range (/thread-1080.html)
Question re 0x40-0x4F CF controller range - Graham72 - 31-08-2026
Hi, sorry to intrude in this area, hardware is not my thing.
Hoping somebidy can explain for a compact flash edition the correct listing of FDC / CF control address lines.
Some references 0x40 , others 0x44.
A full listing would be appreciated. Thanks g
RE: Question re 0x40-0x4F CF controller range - MbeeTech - 31-08-2026
On the regular 128k coreboard A2 is not decoded for the FDC chip select, and the chip select covers an 8 address range (0x40 to 0x47), so the ports at 0x44->0x47 are also available at 0x40 -> 0x43.
The side select port is at 0x48 which selects the drive number, side & density. Reads to 0x48 are required to test the DRQ/INT status from the FDC.
As to the CF configuration, I have no idea what ports it uses.
RE: Question re 0x40-0x4F CF controller range - greybeard - 31-08-2026
If you mean the 8 bit compact flash interface to the bee then the cf8/ide interface is addressed at ports starting at 0x60 upto 0x67.
[edit]
FDC wasn't touched or moved, all of the existing port mappings are unchanged from stock microbee as per Ewan's post above
RE: Question re 0x40-0x4F CF controller range - Graham72 - 01-09-2026
thamk you both. g