RE: 1541IDE and 1541IDE-S
Date: 2007-12-05 15:02:39

Hallo Jesper, ATT, Al,

> I suspect he used some crazy windows-webeditor.

Nope. I use wordpad as editor and the blame is all on me. If you have a
look at the sources then you see cause of the problems. The source will
show you here which should have
been here.

I will upload an improved version of the page this evening.

Sorry for any inconvenience.


> I have read your post saying that you were using "256 bytes of 512
> of each harddisk sector". Didn't you say this?

But what is the problem? Maybe this will clear things: an harddisk
sector contains 512 bytes. Using an 8 bits interface means that one can
only access 256 of these 512 bytes. Writing $00, $01 .... $FF to a
sector with my interface and reading the same sector using a PC will
give $FF, $00, $FF, $01, $FF, $02 ..... $FF, $FE, $FF, $FF.

> How are you going to map this to several harddisk sectors, then?

There is a register to tell the harddisk how may sectors you want to
access in one go. So writing 8192 bytes = 32 sectors in a row is no
problem. But you MUST complete the process. If there are only 8000 bytes
on a 1541 track, you must add the missing 192 bytes. When not writing
all 512 bytes to the disk for a sector, you run the risk that the sector
is not written from the buffer to the actual disk.

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