So here's another blurry navigation-picture for the other side of the PCB. The interesting thing here is that they've got the keyboard on a separate PCB.
Notices by Foone🏳️⚧️ (foone@digipres.club), page 3
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:30 UTC Foone🏳️⚧️
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:26 UTC Foone🏳️⚧️
The last interesting thing about the top of the PCB is that there's another speaker, labeled SP1.
There's two stereo speakers as well, so I suspect this is just used for PC Speaker, and was easier than merging the audio in with those other speakers -
Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:24 UTC Foone🏳️⚧️
It's a 60 pin connector. 8-bit ISA is 62 pins, 16-bit ISA is 98 pins.
So if they just merged some grounds, 60-pins is totally doable.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:22 UTC Foone🏳️⚧️
Games included:
Doom, Wolf3d, XianJian QiXia Zhuan (aka Chinese Paladin), Tyrian, Raptor: Call of the Shadows, and Uncharted Waters: New Horizons
Daikoukai Jidai II -
Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:22 UTC Foone🏳️⚧️
Storage is on a 2 gigabyte CF card. It's got Dos 7.1, Windows 95, and a few games pre-installed on it, plus a driver for the CH375 USB storage chip
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:18 UTC Foone🏳️⚧️
So over by the USB port, we've got a CH375B.
This is an 8-bit IO chip for USB, specifically for storage.
(it's also an 8051-based core! there's always an 8051) -
Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:15 UTC Foone🏳️⚧️
There's three 74HC139s, which are dual 2-to-4 line decoders.
This maybe is used for wiring up one of the expansion ports to the ISA bus?
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:14 UTC Foone🏳️⚧️
A YAC512-M. This is a DAC used by the OPL3 to create the analog output of the audio chip.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:12 UTC Foone🏳️⚧️
A PAM8403 three-watt class-D stereo audio amplifier.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:10 UTC Foone🏳️⚧️
Assorted power regulation/charging circuitry that I'm not going to go into.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:09 UTC Foone🏳️⚧️
though I do want to show off this amazing bodge job.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:07 UTC Foone🏳️⚧️
So the keyboard PCB is also the display converter PCB. It stars a Realtek RTD2660, which is a standard video controller. It takes in analog video and drives LVDS displays with it. It's an all-in-one chip that's used on a bunch of cheap monitors, and it's also an 8051!
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:05 UTC Foone🏳️⚧️
Next to it we've got a P25Q40H half-megabyte serial flash chip. This is presumably used to store configuration info for the RTD2660.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:03 UTC Foone🏳️⚧️
The other chip on the keyboard/video board is an HM82C42. I can't find any info on this specific version, but it's almost certainly an Intel MCS-48 acting as a PS/2 keyboard controller.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:10:01 UTC Foone🏳️⚧️
The keyboard is a rubber membrane onto the PCB, like a remote control. It's functional but feels pretty crap.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:09:58 UTC Foone🏳️⚧️
that large connector on the side is called "ISA" on the PCB.
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Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:09:55 UTC Foone🏳️⚧️
The other connector is 12 pins:
This one is PS/2 and VGA. An adapter is included with the device. -
Foone🏳️⚧️ (foone@digipres.club)'s status on Saturday, 03-Jun-2023 01:09:47 UTC Foone🏳️⚧️
there's also the SBVGM audio player, which includes "Funky Stars" and the whole soundtrack of PlanetX3
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Foone🏳️⚧️ (foone@digipres.club)'s status on Monday, 15-May-2023 15:47:10 UTC Foone🏳️⚧️
@forelioned @dosnostalgic I heard about it. It's a scam but sadly I don't have the money to find out exactly what kind of scam it is at the moment
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Foone🏳️⚧️ (foone@digipres.club)'s status on Thursday, 04-May-2023 00:39:26 UTC Foone🏳️⚧️
TIL Jazz Jackrabbit cheats at background parallax by using palette remapping: