Gradiente Expert Plus
This page was last modified 09:07, 13 April 2019 by Rderooy. Based on work by Mars2000you and Gdx and others.

Contents

Description

Computer

The Expert Plus was the third MSX1 computer released by Gradiente. Compared to Expert GPC-1, a RESET button has been added, RGB and Bus expansion connectors have been removed. Main RAM changed from slot 2 to expanded slot 3.0.

Brand Gradiente
Type Expert Plus
Year 1989
Region Brazil
Original price
RAM 64kB in slot 3-0
VRAM 16kB
Media MSX cartridges
Video Toshiba T6950, Texas Instruments TMS9918 compatible (Integrated in MSX-Engine T7937A)
Audio Toshiba T7766A, General Instrument AY-3-8910 compatible (Integrated in MSX-Engine T7937A)
Chipset Toshiba T7937A
Extras built-in speaker with volume control, reset button, firmware: demo called "Ligue-se ao Expert"

Firmware

This computer comes with a built-in firmware that is a modified version of the demo cartridge provided with the Expert XP-800 and the Expert GPC-1 machines.

It starts with a menu including two options (MSX-BASIC and Applications). The Applications submenu has 5 options (Drawing, Music, Consumption, Receipts, Back to BASIC).

Pictures

Gradient Expert Plus
Gradient Expert Plus - back
Gradient Expert Plus with manual
Gradient Expert Plus PCB
Gradient Expert Plus - box

Specifications

The Gradiente Expert Plus is a MSX1. The Z80A, the VDP and the PSG are integrated in MSX-Engine T7937A.

The integrated VDP is the Toshiba T6950, which does not support some undocumented features of the Texas Instruments TMS9918, TMS9928 and TMS9929 VDP's.

The RAM is in slot 3-0, what has been source of trouble for some programs written for the two first Gradiente computers.

Slot Map

Slot 0 Slot 1 Slot 2 Slot 3-0 Slot 3-1 Slot 3-2 Slot 3-3
Page C000h~FFFFh Cartridge
Slot 1
Cartridge
Slot 2
64kB
RAM
Page 8000h~BFFFh Firmware
Page 4000h~7FFFh Main-ROM
Page 0000h~3FFFh

Connections

Links