Is it possible to add SpeccyDOS disk images handling to next version of HxC software?
File extension .SDD, it is raw store of sectors, side 0 stored first.
Sector size 256 bytes.
Boot sector started with "TRKY2" string for identify. (00h-04h bytes)
0Dh bit 0: =0 MFM, =1 FM
0EH bit 6-0: number of tracks, bit 7=0 single sided, =1 double sided
0FH sectors per track
Zozosoft wrote:Is it possible to add SpeccyDOS disk images handling to next version of HxC software?
File extension .SDD, it is raw store of sectors, side 0 stored first.
Sector size 256 bytes.
Boot sector started with "TRKY2" string for identify. (00h-04h bytes)
0Dh bit 0: =0 MFM, =1 FM
0EH bit 6-0: number of tracks, bit 7=0 single sided, =1 double sided
0FH sectors per track
With double density (MFM) format no problem. But with single density (FM) I found some confusion:
The WD1772 documentation say: in single density mode using FM encoding and 125Kbits/sec.
Firstly I created empy HFE with FM and 125000 bitrate. But not working! During the formating the LCD display shows WESR after the track numbers.
Both FM and IBM MFM mode tried.
But if I use 250000 bitrate then working! Both FM or IBM FM.
The (non working) 125000 FM images are about 1MB as expected, but the (working) 250000 FM images are about 2MB, same as MFM images.
When convert back the HFE images to RAW sector images, then the sizes are correct. I saved little Basic program to the images, and found these correctly in the RAW images.
Zozosoft wrote:Now I tested the formating with the beta fw.
With double density (MFM) format no problem. But with single density (FM) I found some confusion:
The WD1772 documentation say: in single density mode using FM encoding and 125Kbits/sec.
Firstly I created empy HFE with FM and 125000 bitrate. But not working! During the formating the LCD display shows WESR after the track numbers.
Both FM and IBM MFM mode tried.
But if I use 250000 bitrate then working! Both FM or IBM FM.
The (non working) 125000 FM images are about 1MB as expected, but the (working) 250000 FM images are about 2MB, same as MFM images.
When convert back the HFE images to RAW sector images, then the sizes are correct. I saved little Basic program to the images, and found these correctly in the RAW images.
Not a surprise : Data rate of 125 Kbits/s in FM = 125 Kbits/s of data bits + 125 Kbits/s of clock bits -> 250kpulses/s on the disk.
Don't forget that the HxC is working at the physical/"magnetic" level. This is a true floppy emulator .
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