This version of DoubleDOS comes from the PCjs Software Archive and likely patched as well (e.g.,
to disable copy protection), since the date for DOUBLEDO.EXE is almost a year newer than the rest of the files.
It also seems to be very DOS version-sensitive. It crashes on PC DOS 2.00 but appears to work OK on PC DOS 2.10, so that’s what we boot with here. A directory listing of the 160Kb diskette is provided below.
[PCjs Machine "ibm5160-doubledos"]
Waiting for machine "ibm5160-doubledos" to load....
Volume in drive A has no label
Directory of A:\
IBMBIO COM* 1920
IBMDOS COM* 6400
COMMAND COM 17792 10-20-83 12:00p
READ_ME 1ST 4992 4-16-84 3:14p
DOUBLEDO EXE 38912 2-28-85 9:13p
DOUBLED2 PGM 23552 4-16-84 3:36p
SWITCH EXE 1408 4-16-84 3:22p
SWITCH ASM 1534 4-16-84 3:40p
123DRIVE BAT 675 4-16-84 2:43p
DBLDMONO DRV 798 4-05-84 2:58p
DBLDCOLO DRV 5363 4-05-84 2:58p
DBLDHERC DRV 5330 3-31-84 2:20p
DBLDB&W DRV 5363 3-31-84 2:56p
DBLDCPQ DRV 798 3-31-84 4:47p
DBLDANSI SYS 1698 4-05-84 2:59p
PRNAME8 VER 36 4-16-84 3:37p
DOUBLED1 EXE 11264 1-01-80 12:14a
17 file(s) 127835 bytes
25088 bytes free