| NEC PC-9801 Series 5.25in. disk |  D'ark Gaiden | 1993 | Himeya Soft., Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | D'BaBOS | 1993 | Himeya Soft., Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | D-Again - The 4th Unit 5 | 1990 | Data West, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | D.C.S - Disk Comic Series 18 | 199? | Asica Soft |
| NEC PC-9801 Series 5.25in. disk | D.O. Best Characters 18 | 199? | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Doki Doki Disk Vol.1 | 1991 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Doki Doki Disk Vol.7 | 1994 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Doki Doki Disk Vol.8 | 1995 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Doki Doki Disk Vol.9 | 1995 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Kaizokuban 18 | 1993 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. - Dream Program System 18 | 1989 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG - Dream Program System SG 18 | 1990 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG 2 - Dream Program System SG Data 2 | 199? | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG 2 - Dream Program System SG Set 2 18 | 1991 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG 3 - Dream Program System SG Set 3 18 | 1991 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.Wars | 1989 | Soft Plan Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Dai 3 Teikoku | 1988 | Soft Plan Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Dai-2-Ji Super Majokko Taisen | 1995 | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Dai4 no Unit - The 4th Unit | 1988 | Data West, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | DaiDassou Model GA-112 | 1985 | Carry Lab. Japan |
| NEC PC-9801 Series 5.25in. disk | Daidou Tsume Shougi | 1989 | Shoudai Sangyou Japan |
| NEC PC-9801 Series 5.25in. disk | Daifugo Gakuen | 199? | Unknown Japan |
| NEC PC-9801 Series 5.25in. disk | Daigekichin - Nichibei Kaitei no Taiketsu | 1991 | Quota Japan |
| NEC PC-9801 Series 5.25in. disk | Daijuutai | 1993 | Japan Road Association |
| NEC PC-9801 Series 5.25in. disk | Daikairei - Dai Nihon Teikoku Kaigun no Kiseki | 1988 | Artdink Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikairei - Make Kit Scenario D-E | 1990 | Artdink Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikairei - Make Kit Scenario F-G | 1990 | Artdink Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikairei - Nankai no Shitou | 1989 | Artdink Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikairei - Nankai no Shitou: Philippines Oki Kaisen + Java Tou Kessen | 1990 | Artdink Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikaisen Solomon 1942-1943 | 1995 | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikoukai Jidai II Model KN10401010 | 1993 | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikoukai Jidai Model KN10040020 | 1990 | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Daikoukai Jidai Model KN10071010 | 1990 | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku - Map Collection 98 Senyou-ban | 198? | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku - Power Up Set | 198? | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku II | 1987 | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku II - Data Collection | 198? | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku II - Editor Set | 1987 | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku II - Map Collection | 198? | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku II Special | 1988 | SystemSoft Corp. Japan |
