Toshiba HX-F101 external floppy disk drive problem.

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By sd_snatcher

Prophet (3505)

sd_snatcher's picture

13-04-2019, 16:07

According to this page (translator needed), the Japanese HX-101 was 2DD, while the export model HX-101PE was 1DD only.

Curiously enough, he also mentions that the Sony HBD-50 was an OEM version of the Toshiba HX-100 (the model that came before the HX-101).

By Hokuspokus

Expert (95)

Hokuspokus's picture

13-04-2019, 18:51

zeilemaker54 wrote:

For those that are interested in the diskdriver code of the HX-F101, the raw version is here:

What exactly does this serve? With this, can you update the ROM of the floppy disk to be 2DD ?.

By Hokuspokus

Expert (95)

Hokuspokus's picture

13-04-2019, 18:51

zeilemaker54 wrote:

For those that are interested in the diskdriver code of the HX-F101, the raw version is here:

What exactly does this serve? With this, can you update the ROM of the floppy disk to be 2DD ?.

By zeilemaker54

Champion (341)

zeilemaker54's picture

13-04-2019, 20:20

Hokuspokus wrote:
zeilemaker54 wrote:

For those that are interested in the diskdriver code of the HX-F101, the raw version is here:

What exactly does this serve? With this, can you update the ROM of the floppy disk to be 2DD ?.

It purpose is mainly to study the code (and how the hardware is used).
I can not deduct from the driver code if the controller hardware has support for selecting the side of the disk (as required for a 2DD FDD), and if so which register and bit to use. If you have this knowledge and you are a skilled assembly developer, you could create a ROM supporting 2DD.

In my msxsyssrc project are multiple diskdrivers which are WD1793 based (with 2DD support) and could be used as a starting point.

By rderooy

Paladin (686)

rderooy's picture

13-04-2019, 21:37

sd_snatcher wrote:

According to this page (translator needed), the Japanese HX-101 was 2DD, while the export model HX-101PE was 1DD only.

Curiously enough, he also mentions that the Sony HBD-50 was an OEM version of the Toshiba HX-100 (the model that came before the HX-101).

That is indeed curious, because Sony invented the 3.5" FDD format, so it seems strange that Toshiba made the drive for Sony instead of the other way around.

By msxholder

Champion (399)

msxholder's picture

13-04-2019, 22:25

That is not strange it the world upside down.
Spectravideo also uses another memory adres register even so hitachi and mitsubishi.
Sony ,Philips and Yamaha are the same.
The FD03 is the godfather of the Philips disk interface the 8230 ,8235 and 8245 etc.
And the maker (bron) comes of a Knitting Company !!
It has as only interface the call verify.

By zeilemaker54

Champion (341)

zeilemaker54's picture

14-04-2019, 00:03

msxholder wrote:

The FD03 is the godfather of the Philips disk interface the 8230 ,8235 and 8245 etc.
And the maker (bron) comes of a Knitting Company !!
It has as only interface the call verify.

I always thought that the JVC HC-F303 was the mother of all philips and sony fdc designs

By rderooy

Paladin (686)

rderooy's picture

14-04-2019, 00:24

So, assuming that Toshiba made the actual unit. How come that the Sony HBD-50 regularly shows up for sale on Yahoo Japan, and we have plenty of pictures of it, and it is supported by openmsx and such. While from the HX-F100, all we have are a few pictures out of old magazines.

By msxholder

Champion (399)

msxholder's picture

14-04-2019, 10:38

The drives of the VY0010 internal vg8230 and some victor hc 90 have an internal 13 pin connector no´ Disk change/Ready´.
If needed i can provide a picture of diskdrives including HX-F100 and surprise HWD-80.

By Hokuspokus

Expert (95)

Hokuspokus's picture

14-04-2019, 14:26

zeilemaker54 wrote:

Quick analysis:
HX-F101 has a WD1793 compatible controller at 07FF0H
FDD busy led at 07FF4H (b2) w ?
Drive select at 07FF5H (b0) r/w ?
Disk change at 07FF6H (b0) r/w ?
DRQ/IRQ at 7FF7H (b7,b6) r
Only media with mediabyte 0F8H and 0FAH are readable by diskdriver
drive is single sided

Curiously, the chip that carries the Toshiba HX-F101 floppy disk drive is the WD2793A ... I do not understand anything. And according to you, it's compatible with floppy drives that carry the chip WD1793!!!

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