Question about CD-Rom support in WinUAE

Zed · 07 February 2010, 22:17

Hi!
I have made a Workbench 3.1 installation and also got the CD-Rom working in the emulated Amiga. Many thanks to Thomas for his great guide I found at this adress: http://thomas-rapp.homepage.t-online.de/uaescsi.html

I have a question about this. In the guide at 2.8 it says this:

Quote:

scroll down to the MaxTransfer line. Change the value to 0xfc00.

When I opend the CD0 using the command:

Code:

ed devs:dosdrivers/CD0

I couldn't find the line. I have added it in CD0 like this:

Code:

MaxTransfer = 0xfc00

Now, I can't see any different if the line exists in CD0 or not. I can read Amiga CD:s without any problem so far nomatter if this line is in the configuration or not.

My question is, what is this parameter used for? I assume it has something to do with the transfer of data between the CD and the Harddrive.

Kind Regards
Zed

thomas · 08 February 2010, 08:52

MaxTransfer defines how many bytes may be read by one command to the device. If it is too high you'll get read errors or corrupted files.

People who tried to install OS 3.9 know what I mean, because the installer always sets MaxTransfer = 0x1000000 which sooner or later results in "volume AmigaOS3.9 has a read/write error".

Zed · 08 February 2010, 18:13

Thank you Thomas for the information.
I have another question about this. What happends if the parameter MaxTransfer is missing in the configuration of CD0. Will it have a default value that is to high?

Kind Regards
Zed

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08 February 2010, 08:52	#2
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 6,985	MaxTransfer defines how many bytes may be read by one command to the device. If it is too high you'll get read errors or corrupted files. People who tried to install OS 3.9 know what I mean, because the installer always sets MaxTransfer = 0x1000000 which sooner or later results in "volume AmigaOS3.9 has a read/write error".

08 February 2010, 18:13	#3
Zed Registered User Join Date: Jan 2010 Location: Sweden Posts: 27	Thank you Thomas for the information. I have another question about this. What happends if the parameter MaxTransfer is missing in the configuration of CD0. Will it have a default value that is to high? Kind Regards Zed

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