WTB: Sony HB-F700 fast disk ROM

By triskalguilo

Resident (40)

triskalguilo's picture

14-02-2017, 16:59

Having recently received my HB-F700D, I'm thrilled to say that it's a fine machine, except of course disk access is painfully slow.

I've heard that there's a second revision of the disk ROM that speeds it up considerably. Anyone got one that they'd be willing to sell to me? Smile Must be able to ship to United States postal code 65804, with tracking and insurance.

I realize I could probably burn a ROM chip myself, but I'm lacking three critical components: ROM chips, a ROM burner, and the ROM data itself -- so, basically, everything, heh Big smile

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By hamlet

Champion (494)

hamlet's picture

14-02-2017, 22:02

Besides you need some soldering skills to swap the roms, I wouldn´t do it.
I would have done it back in the 80s for sure, maybe also in the 90s. But nowadays, just lean back, relax and enjoy the waiting time.

Give yourself a rest.

If you need more speed, buy a real super sonic top of the edge computer.
With a fastloader.

Congrats to finally receive your Sony. It is still one of my favourite MSX machines.

By luppie

Paladin (748)

luppie's picture

14-02-2017, 22:05

I have 2 of the missing components. I've got EPROM's and I have a Burner. If someone can send me the Fast Diskrom as a binary file, I can burn it for you at the cost of the EPROM (€ 2,-) + Shipping (no additional costs)

By triskalguilo

Resident (40)

triskalguilo's picture

21-02-2017, 20:57

luppie wrote:

I have 2 of the missing components. I've got EPROM's and I have a Burner. If someone can send me the Fast Diskrom as a binary file, I can burn it for you at the cost of the EPROM (€ 2,-) + Shipping (no additional costs)

I may take you up on that, luppie Smile

I've managed to locate some disk ROM files (don't ask me how, heh heh Smile ), and I need to know if they're the fast ones or not.

Can anyone confirm that the SHA1 hash of IC6 (the "ext" portion, plus the fast "disk" portion, together) has a hash of FAC61408008410441605733B323D2877FFB8AC7D? Alternatively, if just the fast "disk" portion has a hash of 12F2CC79B3D09723840BAE774BE48C0D721EC1C6?

(There's some evidence that the fast "disk" portion has a hash of 7dcd434d9a244e23afd212d3fea4c3bf3fe2a300, but I haven't been able to find that one.)

By RetroTechie

Paragon (1406)

RetroTechie's picture

22-02-2017, 11:58

triskalguilo wrote:

Alternatively, if just the fast "disk" portion has a hash of 12F2CC79B3D09723840BAE774BE48C0D721EC1C6?

Can confirm... That diskROM formats its floppies with "SNYJX205" in the bootsector. Is a decent speed diskROM (on par with Philips NMS825x/8280 machines) which afaik came factory in a number of HB-F700's. Should work as-is in the HB-F700D. Smile2

For burning into a 27C256: 1st half is the MSX2 subROM, 2nd half is the diskROM.

By hamlet

Champion (494)

hamlet's picture

22-02-2017, 12:22

You guys ruined my ambition to keep virgin MSX computers conserved for the future!

By luppie

Paladin (748)

luppie's picture

22-02-2017, 23:10

I've got a Fast DiskROM with your name on it LOL!

Please contact me at to arange the shipment.

Credits to msx4ever for supplying the dumped ROM-file.

It's also available on my website : https://www.msxinfo.net/downloads/?did=230

By Meits

Prophet (4080)

Meits's picture

22-02-2017, 22:58

Be sure while placing it not to trust the info printed on the mainboard. Some have basic and diskrom info swapped.

By triskalguilo

Resident (40)

triskalguilo's picture

24-02-2017, 01:10

RetroTechie wrote:

Can confirm... That diskROM formats its floppies with "SNYJX205" in the bootsector. Is a decent speed diskROM (on par with Philips NMS825x/8280 machines) which afaik came factory in a number of HB-F700's. Should work as-is in the HB-F700D. Smile2

For burning into a 27C256: 1st half is the MSX2 subROM, 2nd half is the diskROM.

Thanks for confirming! Smile

hamlet wrote:

You guys ruined my ambition to keep virgin MSX computers conserved for the future!

Heh heh, sorry hamlet Big smile I sympathize, actually, because I do like the idea of keeping my hardware as stock/pure/original as possible... So, I haven't entirely decided whether I want to replace the ROM or not... but, since RetroTechie said that some HB-F700's came from the factory with this ROM, then I look at this as more of a repair, instead of an upgrade or enhancement. I think of it like the audio-related changes that I did to my Philips NMS 8250 -- replacing the incorrect resistors with capacitors, flipping the one capacitor, etc -- bugs in the original design, that were fixed in later units.

luppie wrote:

I've got a Fast DiskROM with your name on it Big smile

Holy crap, now that's service! Big smile I will be contacting you shortly Smile

Meits wrote:

Be sure while placing it not to trust the info printed on the mainboard. Some have basic and diskrom info swapped.

Yep, I remember reading this in a few other places as well, so I'll keep that in mind. I've seen some pictures of the ROMs clearly labeled, and in the correct locations on a real motherboard -- so I'll use those pictures as a reference, and ignore the info printed on the motherboard.

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