how does fat16 work ?

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By Leo

Paragon (1236)

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12-05-2010, 23:10

thanks for the info !
by the way my interface is very close to beer it use 8255 and 32kb rom and 74ls139 chips, 4 pins of the 8255 are used to drive the spi interface of the mmc/sd card.
the other lines of the 8255 are used to drive other spi devices.

By Leo

Paragon (1236)

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13-05-2010, 11:51

question :
does DOSSCAN perfroms write and read operations ? or only read ?

By Retrofan

Paragon (1339)

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13-05-2010, 16:00

Hi, Leo. You can look up souce code for BEER IDE ROM, the latest release supports both FAT16 and large disks. However I use different hack for DSKIO - when sector number in DE is FFFF, the actual sector number is stored in system memory area (32 bit value). This is a bit slower but 100% compatible with DOS read/write sector calls

Had to modify FAT reading/writing, sector/cluster mapping, DPB calculation and file read-write routines (Note that while DOS1 caches one sector during file io, DOS2 has a multitude of buffers, so you have to store long sector numbers somewhere)

I wish FAT32 was as easy to implement but alas, there is no space in FCB for 32-bit cluster number, and i want to retain DOS1 compatability Hi, are you able to support fat16 on the Novaxis SCSI interface from Gouda as well since you have experience in this? Smile This interface doesn't have fat16 support right now... Crying

By msxegor

Master (183)

msxegor의 아바타

13-05-2010, 21:21

Most probably yes, but i know nothing about the device.
If documentation is provided, i see no big problems.

By Retrofan

Paragon (1339)

Retrofan의 아바타

14-05-2010, 17:44

Most probably yes, but i know nothing about the device.
If documentation is provided, i see no big problems.

Hi Egor, maybe this documentation is useful? See chapter 6 www.msxarchive.nl/pub/msx/mirrors/msx2.com/kiwi/hardware/pdf/Gouda/Novscsi.pdf It would be great if you can enable fat16 on this one as well... :)

By msxegor

Master (183)

msxegor의 아바타

15-05-2010, 08:03

Thanks

By Leo

Paragon (1236)

Leo의 아바타

15-05-2010, 09:22

sorry for asking but i cant find the sources of the rom beer 202 ide awith fat 16 , i found hddrom19.rom which is binary or sources for partitionning prog but not the of the rom itself i know i had them many years ago but it was v1.6 or 1.3 , dont remember it was on 2003 maybe.

By Retrofan

Paragon (1339)

Retrofan의 아바타

15-05-2010, 14:21

Thanks You're welcome! Hope you can enable fat16 one this interface as well...

By Manuel

Ascended (19273)

Manuel의 아바타

15-05-2010, 14:22

Yeah, that would be cool! I'm a long-term Novaxis user Smile

By Retrofan

Paragon (1339)

Retrofan의 아바타

17-05-2010, 18:32

Thanks Hi Egor! This documentation is sufficient for you?

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