A lot of programs don't work, and I want to figure out why.

[ChaosLord]

The IDE in A1200/A4000 can only transfer chunks of under 64k  kinda like C64.

[psxphill]

The IDE in A1200/A4000 can only transfer chunks of under 64k kinda like C64.

It's PIO so the IDE controller can cope with any size, the problem is the drive. Some can only do 128k and some can only do 64k. SCSI drives don't seem to suffer from the problem.

[Zac67]

SCSI drives have had a decent Inquiry mechanism from the very beginning...

[danbeaver]

I dunno, I have an A4000T that has never cared what the max transfer was on any CF media, nor SD for as long as I have owned it. It runs OS 3.9 and 4.1.6 without issue. Go figure.

[ChaosLord]

@DanBeaver
Does "Doesn't care" include setting your maxtransfer above 128K?



All these years I thought there was a 64K limit!

Everyone always says when you get read/write errs to set ur maxtransfer to a little less than 64K and *poof* bobsyeruncle!

[Zac67]

As psxphill correctly pointed out, the 128K limit is due to a bug (=bad/unclear specification) on many drives. There may be other limits - some SCSI HBAs have 64K DMA limits in hardware.