to16

Thomson TO16 recreation

How to recreate a stripped-down version of the Thomson TO16 PC on a cheap FPGA ?

TO16 PCM specifications

• Date : 1986-87
• CPU : Intel 8088 or AMD P8088-1 @4.77MHz/9.54MHz
• OS : MS-DOS 3.21
• RAM : 512kB expandable to 768kB
• VIDEO : Plantronics Colorplus => CGA with more colors/resolutions
• VRAM : 32kB
• ROM : 64kB (bios)
• Modem : 2400 bauds

FPGA design

• CPU : CPU86 core @5MHz
• RAM : use 8MB SDRAM @100MHz as ~1MB SSRAM : 00000-9FFFF, A8000-FBFFF
• VRAM : use 32kB (0x8000) blockram : A0000-A7FFF
• ROM : use remaining ~16kB (0x4000) blockram as BIOS : FC000-FFFFF