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Watara Supervision

A 1992 handheld: a 65C02 at 4 MHz, a 160 × 160 screen, and a TV Link accessory that plugs it into a television.

Nothing on this board is replaceable

The Supervision's chips are buried under epoxy (glob top, dies mounted straight onto the board) — there is no package to desolder, not even for the processor.

The 65C02 core is an ordinary part and still manufactured, but that is of no help here: it is not in a package. A logic fault on this machine is not repairable at component level.

The Watara Supervision (1992), a direct Game Boy competitor.
The Watara Supervision (1992), a direct Game Boy competitor. Photo: Evan-Amos, Public domain, via Wikimedia Commons.
Inside the Supervision: a single board, an STN screen and the speaker.
Inside the Supervision: a single board, an STN screen and the speaker. Photo: m.c.j. de Jong (mahjongg), Public domain, via Wikimedia Commons.

Identification

Field Value
Manufacturer Watara
Year 1992 ("before Christmas 1992")
CPU W65C02 @ 4 MHz
Sound machine-specific device @ 4 MHz — 2 tonal + 1 noise channel + stereo audio DMA
Screen 160 × 160 LCD, 4 greys, 61 × 61 mm, 61 Hz
Media cartridge
Power 4 × AA or a 6 V adapter
2-player link DE-9 connector
Construction glob-top chips — ⚠️ nothing replaceable

Expected clocks — measurement table ✅

Component Frequency Scope
W65C02 4 MHz base model
Sound device 4 MHz same

The TV Link variants do NOT run at 4 MHz

This is the measurement trap on this machine.

Variant CPU clock Refresh
Supervision (base, 1992) 4 MHz 61 Hz
PAL colour TV Link (1993) 4.43 MHz 50 Hz
NTSC colour TV Link (1993) 3.56 MHz ⚠️ 60 Hz

The PAL row follows the television standard: 4.43 MHz is the PAL subcarrier.

The NTSC row, however, does not — the NTSC subcarrier is 3.579545 MHz, nearly 20 kHz away from the driver's value. That is most likely why its author marked it with a question mark.

⚠️ Important caveat: the MAME driver marks the NTSC value with a bare "?". It is therefore unverified — do not condemn a crystal on that basis alone.

An official accessory allowed play on a television, the picture switching to four colours instead of the handheld's greyscale. The MAME driver knows several variants — TV Link PAL, plus the "TV Link Colored" models in PAL and NTSC.

The full-colour version never existed

A full-colour TV Link was in the works but was cancelled: the console had failed to find its audience. There is no point hunting for one.

Common faults

Symptom Likely cause Lead
No power battery contacts, or the power socket 4 × AA or a 6 V adapter
Blurred / ghosting image ⚠️ may be the original screen See below
Clock "wrong" on a TV Link nothing — the frequency depends on the model See the variants table
No sound on headphones stereo audio DMA channel The speaker is mono: test both
Cartridge not recognised connector contacts Isopropyl, never an abrasive
Dead 2-player link the DE-9 connector or its cable An external, accessible failure point

The blurry screen is a factory defect, not a fault

The machine is known for a poor-quality screen, prone to blurring, to the point that following the action was difficult. That is how it left the factory: replacing the panel will not sharpen the picture.

Procedure — a dead console, step by step ✅

What this adds

Ordered for a console, not for an arcade board: what kills these is almost never the CPU. It is, in real order, the power supply, the capacitors, the drive or the cartridge slot, and only then the logic. → PCB diagnosis

1. The power supply. Two cases, depending on the machine. External brick: ⚠️ read the marking on the machine, next to the socket, and check the adapter against it — voltage and polarity. A centre-negative machine fed centre-positive loses its fuse, sometimes its regulator; do not trust a third-party label or a generic tip. Internal supply (the machine plugs straight into the wall): mains is inside the shell. Unplug, wait, and confirm the large capacitors are discharged before touching the board. Either way, measure under load: a failing supply holds its voltage until it is asked for current.

1b. Battery and its contacts. On this machine, before anything else: corroded battery contacts, or a cell that reads fine off-load and collapses under it, give exactly the symptoms of a dead machine.

2. The fuse. Many of these machines have one right behind the socket — it is the part designed to die. Test it in continuity, out of circuit. A fuse that blows again is a short, not a fuse problem.

3. Capacitors. On most machines of this age this is the default suspect rather than a last resort — leaking SMD electrolytics eat the tracks underneath before they give any other sign. ⚠️ Not all of them are like that: some carry very few and are not recapped on principle. Read what this page says about it before reaching for the iron. → Recap

4. The cartridge connector. Cartridge contacts with isopropyl alcohol, never an abrasive eraser: it takes the gold plating off and the problem comes back worse. On the machine side, inspect the slot pins — splayed, bent or oxidised — and check continuity between slot and board.

5. The screen. Lines, a dead half, a picture that fades: it is almost always the ribbon and its solder joints, not the panel. Reseat before you order anything. If this machine has a TV output — not all of them do — test that too: it tells the screen apart from what feeds it.

6. Still nothing. Now, and only now, the logic: rails on the board, reset, clock, bus. → PCB diagnosis

Repair (technician)

  • ⚠️ Do not expect to swap a chip: everything is under epoxy (see the box at the top of this page). The only genuinely repairable points are external: batteries and their contacts, the power socket, the cartridge connector, the DE-9 connector, the screen.
  • Check the model before measuring: a PAL TV Link at 4.43 MHz and an NTSC one at ~3.56 MHz are within spec, not drifting.
  • The battery compartment first, as on any handheld of this age.

→ Methods: PCB diagnosis · Recap

Modernisation & mods

  • ⚠️ Do not host ROMs — method only.

Photos / assets

(To take: the board and its epoxy blobs — the most useful illustration this page could have — the battery compartment, the DE-9 connector, and above all a TV Link accessory if you ever meet one: it is this console's rare part.)

Sources & attribution

Text (synthesis; sources listed for attribution):

  • MAME — src/mame/svision/svision.cpp (GPL-2.0+, driver by Peter Trauner): the W65C02 at 4 MHz and the sound device at 4 MHz; the 160 × 160 LCD at 61 Hz; and the variants with their own clocks — Super Vision (1992), PAL colour TV Link (1993) at 4,430,000 Hz / 50 Hz, NTSC colour TV Link (1993) at 3,560,000 Hz / 60 Hz, the latter value being followed by a "?" in the driver and therefore unverified, plus a TV Link PAL entry — https://github.com/mamedev/mame/blob/master/src/mame/svision/svision.cpp

  • Wikipedia — Watara Supervision (CC-BY-SA): the release "before Christmas 1992"; the 65C02 running at 4 MHz (agreeing with MAME); the "160 × 160 pixels, 4 greys LCD" measuring 61 × 61 mm; power from "4 × AA batteries or 6V AC/DC adapter"; sound as "2 Tonal and 1 Noise Channel plus additional audio DMA stereo output channel" with built-in speaker and headphone jack; the TV Link accessory, games then displaying "in four colors", and the cancelled full-colour TV Link; the two-player link on a DE-9 connector; and the "poor quality screen which was prone to blurring" — https://en.wikipedia.org/wiki/Watara_Supervision

  • Wikipedia — Gamate (CC-BY-SA): this is the article documenting the Supervision's glob-top construction — "Unlike other Taiwanese or Hong Kong Game Boy competitors, such as the Watara Supervision, Hartung Game Master and the Mega Duck, the Gamate's internal hardware contains no epoxy covered chips" — https://en.wikipedia.org/wiki/Gamate

Image:

Review & corrections

How this space is used

Spotted a wrong value, an outdated procedure, a chip reference that does not match your board? Say so here, with what you observed (model, board revision, serial number, measurement). Every report is cross-checked against a source before anything changes — an unverifiable correction is published as “reported by …, not cross-checked” rather than silently applied.

Reading is open to everyone; posting requires signing in with Discord. Reports from the wiki's declared reviewers are handled first; anyone else's are read too, but go through a human before anything is changed.