Changes between Version 1 and Version 2 of vtech/cqfd-scientus


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Timestamp:
Apr 29, 2021, 9:00:06 AM (3 years ago)
Author:
pulkomandy
Comment:

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  • vtech/cqfd-scientus

    v1 v2  
    55This machine is likely based on the same z80 chipset as many other VTech laptops. Interestingly it has an AM27C040 UVPROM, meaning the machine was produced in relatively small quantities so a custom mask ROM was not appropriate.
    66
    7 It uses the same soundchip as the IQ unlimited laptop (https://alexandre.botzung.fr/fr/vtech-i-q-laptop), VTECH part number 27-05992-0-0. It appears to be based on TI MSP50C3x microcontroller.
     7It uses the same soundchip as the IQ unlimited laptop (https://alexandre.botzung.fr/fr/vtech-i-q-laptop), VTECH part number 27-05992-0-0. It appears to be based on TI MSP50C3x microcontroller (https://www.ti.com/lit/ug/spsu006c/spsu006c.pdf?ts=1617221600403) based on TI markings on the chip, and matching pinout.
    88
    99The display is a mixed text/graphics one. It is based on a 14 x 4 characters matrix, but some characters have a 1px border around them, and some don't. This allows to display graphics in the central area, and text on the sides.