Missing toshiba HX-F101 cartridge, reverse engineering schematics for it?

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By popolon_

Master (152)

popolon_'s picture

07-03-2021, 16:53

Now I tried to boot SVI728 and Sony Hitbit-75P with this cartridge only (no cable connected to external unit). The boot hangs in both machines in start screen:
IMG 20210307 174906967

I used 27C256 rom filled with original disk rom copied twice. pin A14 is connected to +5V via 10K ohm resistor.

By popolon_

Master (152)

popolon_'s picture

07-03-2021, 17:02

It seems in toshiba HX34, when disconnecting FDD cable, the machine does not boot (hangs after MSX2 logo, screen turns blue). So I have to test with the external unit.

By popolon_

Master (152)

popolon_'s picture

07-03-2021, 19:49

Yes, with drive unit also connected, the floppy now seems to work with this cartridge design.
IMG_20210307_203402946.jpg
IMG_20210307_203510842.jpg
IMG_20210307_203325597.jpg

Now the problem is where to get the 34 pin round cable? Or would 18 pins be enough?

By st1mpy

Paladin (709)

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07-03-2021, 20:26

Wow nice it works!
Round floppy cable, there are loads on ebay, with a choice of different colours.

By popolon_

Master (152)

popolon_'s picture

07-03-2021, 20:47

But are those ebay cables one to one mapping, or those 10,12,14,16 pins swapped? As i need cable that is not swapped.

By st1mpy

Paladin (709)

st1mpy's picture

07-03-2021, 21:32

The cable that is for 2 drives, one of them is a straight connection.

By popolon_

Master (152)

popolon_'s picture

08-03-2021, 20:37

I think i will try to make the cable from scsi cable.

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