| Video RAM | 1MB VRAM on main system board |
| Shadow RAM | Automatic shadowing of system and VGA |
| BIOS ROM into RAM; shadow RAM |
| address control selectable through SETUP |
| Cache | 8KB of internal cache (built into the |
| microprocessor); cache testing and address |
| control selectable through SETUP |
| Virtual cache | Epson proprietary VirtualCache feature |
| automatically creates a “virtual cache” |
| buffer the size of maximum system |
| memory |
| Math | On 4DX2/50 and 4DX2/66 systems, math |
| coprocessor | coprocessor built into the microprocessor |
| Clock/ | |
| calendar | RAM on main system board; separate |
| battery backup |
Controllers
| Video | Chips and Technologies Wingine VGA |
| controller on main system board; provides |
| resolutions up to 1024 x 768 |
| Diskette | Controller on main system board supports |
| up to two diskette drives or one diskette |
| drive and one tape drive |
| Hard disk | Interface on main system board supports |
| up to two IDE hard disk drives with |
|
A - 2 Specifications