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- Working report
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- To: Craig
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- From: Jian
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- Subject: Jobs I have done during the last two weeks
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- Date: Mar 10, 93
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- 1. Traced the reason why that AHDI DRIVER can't read or write to the IBM OEM
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- 0663E15 drive, and found out the area that may cause the problem is: when
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- the DMA controler after read and sent the data through the ACSI bus, then
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- it will do some hand shake with the hard disk, and told the hard disk the
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- comment block sending is finished, somehow the IBM hard disk respects more
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- hand shake byte than the current ACSI comments provide to the DMA controler
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- So the hard disk just sit there and waits for the some more byte to hand
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- shake. When next time, the DMA controler try to do the read or write comment
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- to the drive, it will fail. So I discussed this problem with John Hoenig,
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- and hope he can help me to find out what kind of hand shake for this kind of
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- drive need in order to do a completely read or write comment. Then I can
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- change some low level hand shake code between the DMA controler and the
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- drive.
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- 2. Evaluated a Maxtor P1-17S hard disk drive for the Falcon SCSI-2 drive, and
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- fixed a HDX 5.01 bug which can't partition a logic drive over 256MB. And
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- found out the AHDI, HDX, and Falcon SCSI-2 drive are work fine for the
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- Maxtor P1-17S hard disk drive. But in about 5MB sectors after 1GB, the read
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- and write comment just can do it successfully, so when HDX does the markbad,
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- HDX just treats it as the bad sector, but because it too much, so the HDX
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- fail. It may be the bad sectors, or it may be the same problem as the hand
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- shake for such IBM OME dirve. Now I don't give more time for this dirve
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- unless I find out those hand shake problem. But I found a way to make that
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- drive can be worked for the Falcom SCSI-2, when do the format, skip the mark
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- bad sectors, and partition some kind of scheme to avoid the those sectors
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- inside the partition header, then every thing will work fine.
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- 4. Learn how to use the tool to check the change between the new version and
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- the old one. Now, I check in all the source files for the AHDI, and in
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- the future if any change to the AHDI, I can use the tool to chack what
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- kind of changes that have done. I'll do this to the HDX and PIXVDI too.
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- 3. Set up a system for the PIXVDI so that I can build the SCREEN.PRG and
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- SMSCREEN.PRG.
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