Broken HBI-V1

Door Takamichi

Master (253)

afbeelding van Takamichi

06-06-2019, 13:59

Many years ago I acquired a Sony HBI-V1 digitizer but never booted it. I thought about selling it so I booted it, selected "LOAD DIGITIZING SOFT" then a message prompting me to insert a cartridge shows up and returns to initial screen.
I then tried the "Digitizing in interlace (256×424) mode" BASIC program from https://www.msx.org/wiki/Sony_HBI-V1 then the result was "Device I/O error in 30". Obviously the cartridge isn't working.

When I ran GETROM.BIN there was a rom in slot 1-0 so the cartridge itself probably isn't 100% dead. The sucked 16KB rom is here but the rom size must be 32KB therefore probably it's corrupt.

Can anyone guess the cause, and is there anyone who still wants this cartridge even in this state?

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Van gdx

Prophet (3037)

afbeelding van gdx

06-06-2019, 15:37

I think your MSX must be NTSC. If that is the case, check the solder joints and redo the dry joints. clean the contacts and check the PCB. Change chemical capacitors.

Van Takamichi

Master (253)

afbeelding van Takamichi

06-06-2019, 16:34

I took the photos of the PCB inside. There is no obvious deterioration but something must be wrong. I'm not a hardware expert so I probably will give this stuff away to brighter person.
Yes it's an unmodified NTSC ver. I tried to run with an A1-GT. Edit: Photo link was wrong, corrected.

Van Jipe

Paragon (1366)

afbeelding van Jipe

06-06-2019, 16:37

have you connect a video signal in RCA input ?

Van Alexey

Guardian (2385)

afbeelding van Alexey

06-06-2019, 17:03

The photos are too small and blurry to see the details.

Van Takamichi

Master (253)

afbeelding van Takamichi

06-06-2019, 17:53

Jipe wrote:

have you connect a video signal in RCA input ?

No I didn't connect anything so I retried with a VHS player connected... yes the digitizer is working! I didn't know HBI-V1 doesn't work without input signal. Thank you for the input Smile

Van RetroTechie

Paragon (1563)

afbeelding van RetroTechie

07-06-2019, 00:56

You might want to replace the EPROM with one where a known good dump of the cartridge ROM was 'freshly' burned in. Original EPROM was 'burned' almost 30 years ago, after so long you should expect that random bits will start flipping (probably from 0 to 1). If they haven't already. Question

Even if you'd dump the current EPROM, and verify its contents to be 100% okay, you could still have lots of bits flipping in say 1..3 years from now, possibly turning the cartridge in a brick. You want to wait for that?

Doesn't necessarily have to be a 'new' EPROM btw. You could take the old one, find an EPROM eraser, and re-write the chip. What counts is the 'recording' being fresh.

Van Takamichi

Master (253)

afbeelding van Takamichi

07-06-2019, 05:50

Alexey wrote:

The photos are too small and blurry to see the details.

If you push the link with (+) icon you'll get the bigger picture. Quick links; here and here
And long time thanks for translating Czech for MG2, I still appreciate it.

Van Takamichi

Master (253)

afbeelding van Takamichi

07-06-2019, 05:53

Yes the board indeed has an EPROM but I will leave the matter to future owner. I am sure this board was seldom powered for 30 years but that fact doesn't increase/shorten EPROM life.