Author
| HD disks on MSX computers
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ViktorH
msx friend
Posts: 11 |  Posted: July 28 2007, 19:11 |
Hi!
I recently bought a Philips VG 8235 with a PC diskdrive. It seems that I am able to use HD disks on the MSX computer (holes not covered). Is that supposed to work?
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CrazyBoss
msx freak
Posts: 144 | Posted: July 28 2007, 19:36 |
maybe its a 720kb drive
or maybe the diskdrive dont see the diffirence between HD and DD
For sure it will not format the disk with 1.44mb 
Back in the old days, Henrik Gilvad played with the thinking to make a 1.44 on his MSX.
But he said the diskcontroller can handle it, and also maybe to few memory or cpu speed to handle it.
I dont know. The diskrom have to be modified to read/write 1.44 disks. Its not possible just to change the drive
-CB-
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manuel
msx guru
Posts: 3449 | Posted: July 28 2007, 19:36 |
You can only format them as 720kB DD disks.
If not, you have something special and unique |
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Sd-Snatcher
msx freak
Posts: 250 | Posted: July 28 2007, 19:42 |
Covering the hole is needed by the PC to read HD flopies formated in 720K disk, not by the msx itself, the HD drive on the pc is who need it.
The only way to use 1.4 flopies on MSX is to use an LS120 unit with an IDE controller (or SCSI if exist)
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Prodatron
msx master
Posts: 1109 | Posted: July 28 2007, 21:07 |
The FDCs of the MSX are not clocked in the way, that would make reading HD discs possible.
Maybe you can modify your disc rom + writing fast enough routines, so that the Z80 can read the double speeded data stream of a HD disc, but your FDC would still fail.
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ViktorH
msx friend
Posts: 11 | Posted: July 28 2007, 21:14 |
Thanks for the quick replys!
The HD disks could only be read after I formatted them on the MSX. However, I thought that I couldnīt even format HD disks on the MSX-computer without covering the holes.
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manuel
msx guru
Posts: 3449 | Posted: July 28 2007, 23:16 |
It depends on the disk drive.
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CrazyBoss
msx freak
Posts: 144 | Posted: July 30 2007, 08:52 |
if the diskdrive in your msx is a true dd (720kb) you dont need to cover hd hole on the disk.
or if its a 1,44 drive maybe its modified so it dont detect the hole maybe the switch are removed or something
anyway if you dont cover the hd hole you cant read the disk in a pc (with a 1,44drive)
-claus-
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