Groups comparison

IBM PCjr platform - 1982 to 1990
A budget PC by IBM, scaled down & added a cartridge bus. Games on cart or disk. Designed to be 'home friendly' & 'game friendly'. Quickly discontinued

Tandy 1000 platform - 1982 to 1991
Tandy was highly "MS-DOS compatible" but an imperfect match to changing IBM specs over time. Many companies made 'Tandy 1000' editions of DOS games.

Tandy Graphics Adapter - 1982 to 2018
Improvement on IBM's Color Graphics Adapter that supported 16 colours at 320x200 resolution, introduced in 1984.

Tandy SPU (Tandy 3-voice) - 1982 to 2018
Uses one of on board sound systems unique to the Tandy 1000 series (IBM-PCjr compatible). Or PCjr sound.

Tandy Video II (Tandy ETGA;Tandy Mode-E) - 1986 to 2018
Adds 4-bit color and 16-bit palette to Tandy graphics and includes 640x200x16 color (256 palette)

Tandy DAC - 1989 to 1997
Late model Tandy MS-DOS compatible PCs added 8-bit Digital-to-Analog Converter hardware & protocols for HQ music & sound at 48kHz & emulation of other SPUs