necwab

necwab - NEC Window Accelerator Board(WAB) test on OpenBSD/luna88k

This is my experimental program to use NEC and other 3rd-party-made WABs (for PC-9801 series) on OpenBSD/luna88k.

Target WABs

• PC-9801-96 "Windows Accelerator Board B3", Cirrus Logic GD-5428, 1MB VRAM
• PC-9801-85 "Windows Accelerator Board B", S3 928, 1MB VRAM
• MELCO WGN-A2, Cirrus Logic GD-5434, 2MB VRAM
• MELCO WSN-A2F, Cirrus Logic GD-5434, 2MB VRAM (and sound functions)

Current status

PC-9801-96

1024x768(8bpp), 800x600(8bpp and 16bpp), and 640x480(8bpp and 16bpp) modes are working with this program.

Note: Although the GD-5428 itself has linear addressing feature, this board seems not support linear addressing. So here I have to use "paging" addressing (base and offset) scheme on 1MB VRAM:-(

PC-9801-85

Not working yet, just tweaking...

MELCO WGN-A2

Both 1280x1024(8bpp) and 1024x768(16bpp) modes are working as well as other modes supported on PC-9801-96.

MELCO WSN-A2F

Both 1280x1024(8bpp) and 1024x768(16bpp) modes are working as well as other modes supported on PC-9801-96.

References

• "True Color VGA Family CL-GD542X Technical Reference Manual", Cirrus Logic.
• "Alpine(tm) VGA Family CL-GD543X/'4X Technical Reference Manual", Cirrus Logic.
• GD5428/5430/5440を使う http://darudarudan.syuriken.jp/kai/pc9821.htm#GD54xx
• VGAグラフィックドライバー VGAについて http://softwaretechnique.jp/OS_Development/Driver/GF/VGA/vga01.html
• PC-9821シリーズのCL-GD5428,5430,5440を使う方法 http://www.webtech.co.jp/amiware/lzh/nec_clgd.txt
• UNDOCUMENTED 9801/9821 Vol.2 - メモリ・I/Oポート編 ウィンドウアクセラレータボード http://www.webtech.co.jp/company/doc/undocumented_mem/io_wab.txt

Special Thanks

• @oshimyja: donated his PC-9801-96 WAB