Neznámy 4-bitový microcontroller

[MilanBA]

Vedel by, prosím, niekto poradiť, aký 4-bitový microcontroller je na schematických obrázkoch v prílohách?
Rád by som vedel výrobcu a označenie, úplne ideálny by bol datasheet.

Sú to čipy zo starých handheld LCD hier (80. roky minulého storočia) od rôznych výrobcov, ale som veľmi silno presvedčený, že je za tým vždy jeden a ten istý microcontroller.
Na prvý pohľad sa to z obrázkov nemusí zdať, pretože MCU/čip môže byť na doske upevnený v rôznych polohách, ale pin layout je na všetkých typoch zhodný.

Stručná charakteristika:
- 4-bitový MCU s LCD driverom
- minimálne 60 pinov, z toho
* 36 segmentových pinov (#1-11, 35-52, 53-60)
* 4 COM piny (#31-34)
* max. 8 I/O pinov (#12-15, 16-19)
- napätie: 3V (2x 1,5V)
- frekvencia kryštálu: 32 768 Hz

Určite to nie sú tieto:
SHARP SM5A / SM510 / SM511
NEC uPD7501 / uPD7502 / uPD7503
HITACHI HD43380 / HD43381
SMOS Systems SMC1112

 

[MilanBA]

Skúsim sa pripomenúť s touto mojou stále neuzavretou vecou...
Možno sa medzitým niekto dozvedel niečo, čo ma posunie ďalej.
Vopred ďakujem za čokoľvek, čo naznačí aspoň smer, ktorým sa v pátraní po neznámom mikrokontroléri uberať.

 

[Rami6711]

Ja by som začal tu:

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Je tam celý zoznam. Bude to mravčenia práca, ale to tak občas býva.

 

[seanriddle]

Could someone please advise which 4-bit microcontroller is in the schematic images in the attachments?
I would like to know the manufacturer and designation, a datasheet would be ideal.

They are chips from old handheld LCD games (1980s) from different manufacturers, but I strongly believe that it is always the same microcontroller behind it.
At first glance, it may not seem like it from the pictures, because the MCU/chip can be fixed in different positions on the board, but the pin layout is the same on all types.

Brief characteristics:
- 4-bit MCU with LCD driver
- at least 60 pins, of which
* 36 segment pins (#1-11, 35-52, 53-60)
* 4 COM pins (#31-34)
* max. 8 I/O pins (#12-15, 16-19)
- voltage: 3V (2x 1.5V)
- crystal frequency: 32,768 Hz

It's definitely not these:
SHARP SM5A / SM510 / SM511
NEC uPD7501 / uPD7502 / uPD7503
HITACHI HD43380 / HD43381
SMOS Systems SMC1112

I have come across a couple of these. One marked Gakken 6814 in Lansay Football, and another marked GOLF (in Japanese) 6906 in Bandai Challenge Golf. I do not know anything about them, but I did decap 6814 and posted pics here:

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[MilanBA]

I have come across a couple of these. One marked Gakken 6814 in Lansay Football, and another marked GOLF (in Japanese) 6906 in Bandai Challenge Golf. I do not know anything about them, but I did decap 6814 and posted pics here:

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Hi Sean, welcome to this forum. It's an honor to meet you here.
Thank you very for your contribution. I will take a look at the picture.
It's a pity there is no information about these microcontrollers as I think they were used quite often in vintage LCD games.
(I've also sent you a private message.)

 

[seanriddle]

Hi Sean, welcome to this forum. It's an honor to meet you here.
Thank you very much for your contribution. I will take a look at the picture.
It's a pity there is no information about these microcontrollers as I think they were used quite often in vintage LCD games.
(I've also sent you a private message.)

Since the pinout is so similar to Sharp SM5, I was hoping it was a clone with slightly rearranged pins. I'm not very good at reverse engineering from die shots, but I don't think it is- the ROM appears to be 10 bits wide.