Contents |
Description
The computer YIS-303 is a bridled CX5. This model was sold without any module, the printer port and half of the RAM are missing. The color is also different.
It was aimed at the Japanese market and features a simple Japanese keyboard with 70 keys. The power supply is internal.
Official price: ¥49,800
| Brand | Yamaha |
| Type | YIS-303 |
| Year | 1983-11 |
| RAM | 16kB (in slot 0) |
| VRAM | 16kB |
| Media | MSX cartridges, side slot modules |
| Video | Texas Instruments TMS9918A |
| Audio | PSG (YM2149) |
| Chipset | Yamaha YM5214 |
| Extras |
Pictures
Specifications
The YIS-303 supports all Yamaha modules, but not the module HC-A602S from Victor. The Video processor is not a TMS9928A.
To use the expansion bus as second cartridge slot, you need the Yamaha Single Cartridge Adapter CA-01.
The printer port is missing but we can add it by soldering a connector and the four chips near the cartridge connector on PCB. We can also add 16KB by soldering 4416 x2 and two 74LS244 instead the straps in the chip locations near at right.
Slot Map
| Slot 0 | Slot 1 | Slot 2 | Slot 3 | ||||
|---|---|---|---|---|---|---|---|
| Bank C000h~FFFFh | RAM | Cartridge Slot | Expansion Bus | Module Slot | |||
| Bank 8000h~BFFFh | |||||||
| Bank 4000h~7FFFh | Main-ROM | ||||||
| Bank 0000h~3FFFh |
Connections
- DIN 41524 Monitor output
- Tape recorder connector
- 2 general connectors (joysticks, mouse, paddle controllers, ...)
- 1 cartridge slot
- 1 module slot (left side, 60 pin connector without signals need for superimpose)
- 1 expansion bus slot (back side, 2nd cartridge slot via CA-01 adapter)
External links
- http://www.cx5m.net/
- Yamaha YIS-503/303 flyer (Japanese)
- Blog post about the YIS-303 and 503 (Korean)