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Title: Hotbit  
Author: World Heritage Encyclopedia
Language: English
Subject: Gradiente Expert, MSX
Publisher: World Heritage Encyclopedia


Type home computer
Release date November, 1985
Discontinued 1988
Operating system MSX BASIC, MSX-DOS, CP/M
CPU Zilog Z80A @ 3.58 MHz
Memory 64 KB–512 KB (max.)

The Hotbit HB-8000 was a MSX1 home computer developed and sold by the Brazilian subsidiary of Japanese corporation Sharp through its EPCOM home computer division, in mid-1980s. The MSX machines were very popular in Brazil at the time, and they virtually killed all the other competing 8 bit microcomputers in the Brazilian market.[1]

Versions 1-1.2

The Hotbit had three versions: 1.0 and 1.1 with gray and white case and 1.2, with a black case and a ROM slightly modified to solve an ASCII table compatibility issue with the other popular Brazilian MSX, the Gradiente Expert.

Technical specifications

CPU Zilog Z80A @ 3.58 MHz
VRAM 16 KB (TMS9928NL)
Keyboard mechanic, 73 keys (with 4 cursor keys), reset key
Display text: 40×24 rows; graphics: 256×192 pixels, 16 colours, 32 sprites
Sound General Instrument AY-3-8910 (PSG), 3 voices, white noise
Ports 2 joystick connectors, TV out, sound out, tape recorder connector, parallel port, 2 cartridge slots
Storage tape recorder (1200/2400 bps) or one or two external 5¼" disk drive (360 KB)


Serial interface for external Modem HB-3000.
  • HB-100: joystick
  • HB-2400: tape recorder
  • HB-3000 or HB-3001: external modem
  • HB-3600: Dual disk drive controller and power supply. Sold in a bundle with one HB-6000 drive
  • HB-4000: 80 columns card with the V9938 VDP inside
  • HB-4100: 64KB RAM expansion
  • HB-6000: 5¼" disk drive (slim height), 360 KB


  1. ^ Hotbit at

External links

  • (Portuguese)-Sharp Hotbit
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