MSX 1
National CF-1200
msx_cf1200

National CF-1200

The National CF-1200 is manufactured by the Matsushita Denki corporation for the Japanese market. National was up until then the brand name that Panasonic used to produce computers for the international market, but the CF-1200 was meant for the internal Japanese market.

The CF-1200 resembles the CF-2700 but only has half the memory. With 16kB RAM it meets the minimum requirement for the MSX standard, but it is not much to work with.

The MSX Computer Standard

MSX was announced by Microsoft and the ASCII Corporation on June 16th 1983. It was marketed by Kasuhiko Nishi, who was Vice-President at Microsoft and a director at the ASCII Corporation. MSX was an attempt to create a hardware and software standard among various home computers, similar to what VHS had accomplished for the Home Video market.

The MSX Standard defines specifications for:
  • CPU and Memory
  • Video Output hardware
  • Audio hardware
  • Cassette and Disk drives
  • Keyboard, mouse and joysticks
  • Expansion and I/O ports

MSX was a standardized home computer platform announced on June 16th, 1983 as a joint effort between Microsoft and Japan’s ASCII Corporation. It was marketed by Kasuhiko Nishi, who was Vice-President at Microsoft and a director at the ASCII Corporation, with the goal of creating a unified hardware and software standard across multiple manufacturers. At the time, the home computer market was highly fragmented, with each company offering its own incompatible systems. The MSX standard addressed this by providing a common architecture that companies like Sony, Panasonic, Philips, Toshiba, and Yamaha could all build upon, ensuring that software and peripherals would run consistently across machines. At its core, the MSX used the popular Zilog Z80 processor, featured cartridge slots for games and applications, and supported both cassette tape and disk drives, making it versatile for both gaming and productivity.

The MSX Standard defines specifications for:

  • CPU and Memory
  • Video Output hardware
  • Audio hardware
  • Cassette and Disk drives
  • Keyboard, mouse and joysticks
  • Expansion and I/O ports

The MSX line saw several evolutions, including MSX2, MSX2+, and MSX Turbo R, each improving graphics, sound, and performance to keep pace with the growing demands of the market. While it never achieved major success in the United States, the MSX was a significant force in Japan, much of Europe, and South America, where it became a beloved platform for gaming, programming, and creative applications. Iconic game developers such as Konami and Hudson Soft produced influential titles on the MSX, helping to shape the future of video games. Today, the MSX is remembered as one of the most ambitious attempts to create a universal home computer standard, and it holds a cherished place in the history of 1980s computing.

MSX hardware ports

Cassette Interface

The MSX Standard calls for all MSX computers to have a standard data-cassette port. This port transports the audio-in/out signals to and from the datarecorder and the computer has a relay-switch on board to turn the recorder on and off.

MSX Cartridge

The MSX Cartridge system uses a 50-pin flat-edge connector to connect to the systems expansion bus. The cartridge slot maps into one of the main- or sub-slots.

MSX Joystick Port

The MSX Joystick connector is backwards compatible with the Atari 2600. It is a so called DB9 style connector and has the same pin-out as the original Atari connector, with the addition of an extra button. This port is also used in analog mode on the MSX to read a mouse, a light-pen or an analog joystick. The MSX Standard called for 2 joystick ports (Joystick A, and B).

Printer Port

The MSX uses a 14-pin Centronics port for connecting a printer. The printer port was not part of the mandatory MSX standard, but the standard strongly recommended manufacturers to implement a printer port.

Other Ports

Other mandatory ports on the MSX computer included a Composite Video or an RF output port for video. Many manufacturers also included an Audio port, a scart port on european models, the JP21 Scart variant for Japanese MSX computers, or an RGB port for better video connection to a monitor

TMS9918 Series Video Display Processor (99n8, 99n9, 91n8, 91n9)

The TMS9918 is a series of video display controllers (VDC) manufactured in 1979 by Texas Instruments, also refered to as 'Video Display Processor' (VDP). The TMS9918 and its variants were used in the ColecoVision, CreatiVision, Memotech MTX, MSX, NABU Personal Computer, SG-1000/SC-3000, Spectravideo SV-318, Spectravideo SV-328, Sord M5, Tatung Einstein, Texas Instruments TI-99/4, Casio PV-2000, Coleco Adam, Hanimex Pencil II, and Tomy Tutor.

Key Features:

  • 256x192 pattern based color pixels per screen
  • 16 different colors
  • 8-bit memory mapped CPU interface
  • No need for DMA, CPU can access VRAM
  • 32 single color Sprites per screen (4 per scanline)

Variants:

  • TMS9918A - 60Hz output, NTSC video
  • TMS9928A - 60Hz output, YPbPr video
  • TMS9929A - 50Hz output, YPbPr video
  • TMS9118 - Different RAM than TMS9918A, otherwise identical
  • TMS9128 - Different RAM than TMS9928A, otherwise identical
  • TMS9129 - Different RAM than TMS9929A, otherwise identical

Sound - The AY-3-8910 PSG

The AY-3-8910 is a 3-voice Programmable Sound Generator, or PSG. It was designed by General Instruments in 1978 for use with their own 8-bit PIC1650 and their 16-bit CP1610 computers.

The PSG is widely used in many arcade cabinets, pinball machines, and many micro-computers. Here is a list of some of the major brands of computer that used the AY-3-8910:

  • Intellivision
  • Vectrex
  • Amstrad CPC range
  • Oric-1
  • Color Genie
  • Elektor TV Games Computer
  • All MSX-1 and MSX-2 computers
  • ZX Spectrum home computers

General Instrument spun of MicroChip Technology in 1987 and the chip was sold under the MicroChip brand, and licensed to Yamaha as the YM2149F which the Atari ST range of computers use. Functionally the PSG is very similar to the Texas Instruments SN76489.

Variants:

  • AY-3-8910
    Comes with 2 general purpose 8-bit parallel I/O ports, used for Keyboard and Joystick in for instance MSX.
  • AY-3-8912
    Same chip, but in a 28-pin package. Parallel port B is not connected to save cost and space.
  • AY-3-8913
    Same chip, but in a 24-pin package. Both parallel ports are not connected.
  • AY-3-8914
    The AY-3-8914 has the same pinout and is in the same 40-pin package as the AY-3-8910, except the control registers on the chip are shuffled around, and the 'expected input' on the A9 pin may be different. It was used in Mattel's Intellivision console and Aquarius computer.
  • AY-3-8930
    Backwards compatible but BC2 pin is ignored
  • YM2149F
    Yamaha Produced chip, same pin-out as the AY-3-8910, but pin 26 could halve the master clock. Can be used to replace the AY-3-8910 if pin 26 is left disconnected.
  • YM3439-D
    CMOS version of the Y2149 in 40-pin DIP
  • YM3439-F
    CMOS version of the Y2149 in 44-pin QFP
  • YMZ294
    Variant of the YM3249 in an 18-pin package. Parallel ports not connected, and all sound channels mixed on 1 port.
  • T7766A
    Toshiba variant of the AY-3-8910, fully compatible. Used in some MSX models.
  • Winbond WF19054, JFC95101, and File KC89C72: Fully compatible versions of the AY-3-8910 produced for slot machines.

CPU - The Zilog Z80

The Z80 quickly became popular in the personal computer market, with many early personal computers, such as the TRS-80 and Sinclair ZX80, using the Z80 as their central processing unit (CPU). It was also widely used in home computers, such as the MSX range, SORD, and the Amstrad CPC, as well as in many arcade games. Additionally, it was also used in other applications such as industrial control systems, and embedded systems. The Z80 was widely used until the mid-1980s, when it was gradually replaced by newer microprocessors such as the Intel 80286 and the Motorola 68000.

The Z80 microprocessor was developed by Zilog, a company founded by Federico Faggin in 1974. The Z80 was released in July 1976, as a successor to the Intel 8080. It was designed to be fully compatible with the 8080, but also included new features such as an improved instruction set, more powerful interrupts, and a more sophisticated memory management system.

Originally the Z80 was intended for use in embedded systems, just as the 8080 CPU. But the combination of compatibility, superior performance to other CPUs of the era, and the affordability led to a widespread use in arcade video game systems, and later in home computers such as the Osborne 1, TRS-80, ColecoVision, ZX Spectrum, MSX, Sega's Master System and many more. The Z-80 ran the original Pac-Man arcade cabinet. The Z-80 was used even in the Game Gear (1990s), and the TI-81 and succeeding graphic calculators.

The Z-80 remained in production until June of 2024, 48 years after its original release. Zilog replaced the processor with its successor the eZ80, an 8-bit microprocessor that features expanded memory addressing up to 16 megabytes, and running up to 50MHz, comparable to a Z80 clocked at 150MHz.

Technical Details
Released 1985
Country Japan
Brand Matsushita Denki
Type MSX 1
Name National CF-1200
CPU Class Z80
CPU Zilog Z80A @3.58MHz
Memory RAM: 16kB
VRAM: 16kB
Sound Chip General Instruments AY-3-8910 Programmable Sound Generator
Sound 3 wave channels + white noise
Display Chip TMS9129 VDP Compatible
Display 40x24 text
32x24 16 color text, pattern based
256x192 16 color, 2 color per 8 pix.
Best Text 40x24
Best Color 16 colors (2 per 8 pixels)
Graphics 256x192 in 16 colors
Sprites 1 color, 16x16, 4/scanline, 32 total
System OS MSX 1 BIOS / MSX BASIC
Storage External Tape, ROM cartridges
Original Price ¥43,800
Related Systems 💾
MSX 1
MSX 2
MSX 1
MSX 2
MSX 2+
MSX Turbo-R
External Links 🌐
msx.org wiki on the National CF-1200
Link to the MSX wiki page for the National CF-1200 MSX computer
MSX Resource Center
MSX Resource Center dedicated to MSX. It has an extensive archive of MSX news, an active MSX forum, lots of information in their MSX wiki and a large section of free MSX software.
OpenMSX Wiki Page
OpenMSX Wiki - The free MSX emulator
OpenMSX Home Page
OpenMSX Home page - for FAQs and downloads of the latest version.
MSX
MSX Wiki Pages
Virtual MSX
MSXVR is a computer that is hardware and software compatible with MSX computers, implemented in FPGA.
Computer Fandom
Computer fandom website for MSX
MSX Games World
MSX Games World, the forever growing MSX Game database. A lot of games are directly playable online.
MSX Blog
MSX Blog is a spanish blog dedicated to everything MSX.
MSX Village
MSX Village is a French language site dedicated to the MSX platform.
MSX Computers
MSX Instagram Page
MSX Home Computers
MSX Facebook Group
WikiPedia: The TMS9918 Video Processor
Wikipedia page about the TMS9918 Video Display Controller (VDC) used in many computers such as MSX, ColecoVision, Nabu, Sord, TI-99 and more
WikiPedia: General Instrument AY-3-8910
Wikipage on the General Instruments AY-3-8910 PSG
Z80 CPU
Wikipedia page on the very popular Z80 8-bit CPU used in many computers of the 1980's era.