Sanyo PHC 70 FD MSX with Floppy
MSX2+ and beyond
The MSX2+ was an advanced iteration of the MSX2 home computer standard, first introduced in 1988, predominantly in Japan. Building on its predecessor, the MSX2+ boasted enhanced graphical capabilities that made it popular among gaming enthusiasts and hobbyist programmers. It featured upgraded video processing with support for three new screen modes, providing smoother animations and more vibrant color depth with up to 19,268 colors. The inclusion of improved sound through the built-in FM sound chip enabled richer audio experiences for games and multimedia applications. Although the MSX2+ did not achieve widespread global adoption like other home computers of the era, it remained a beloved and influential platform within Japan and parts of Europe, setting the stage for the even more powerful MSX Turbo R that followed.
MSX Cassette Pin Layout
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 Connector
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 Connector
Programmable Sound Generator (AY-3-8910 compatible 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 -
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.
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.
CPU View - Zilog Z80 Family
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.
The Z80 quickly became popular in the personal computer
VRAM: 128kB Sound Chip General Instruments AY-3-8910 Programmable Sound Generator Sound 3 wave channels + white noise Display Chip Yamaha V9938 VDP Display All MSX-1 modes
256x212 16 color
512x212 4 color
512x212 2 color
256x212 256 color Best Text 80x24 Best Color 256 simultaneous, or 16 out of 512 colors Graphics 512x424 interlaced Sprites 16 colors out of 512, 16x16, 8/scanline, 64 total System OS MSX 2 BIOS / MSX 2 BASIC Storage External Tape, ROM cartridges