Can I add another diskette drive to a PCjr?
Yes, there are several options. • The PCjr diskette drive controller can be modified to trick it into supporting two disk drives. It requires some soldering work and a software patch to a boot diskette to “convince” DOS that two floppy drives are available. This technique has the interesting side effect of making both floppy disks spin, even when only one of them is being accessed. However, the price is right and this was a relatively common modification. Once the modification was done the drive cable would be replaced and a second drive would be attached. The second drive has to sit outside of the system, usually in its own enclosure complete with a separate power supply. (The separate power supply is needed because the PCjr barely has enough power inside it for its own uses.) The software patch applied to the DOS boot diskette is crude – it just bumps the count of drives on the system. BIOS only looks for one drive, so BIOS doesn’t tell DOS if more than one drive is available. This c
Yes, there are several options. • The PCjr diskette drive controller can be modified to trick it into supporting two disk drives. It requires some soldering work and a software patch to a boot diskette to “convince” DOS that two floppy drives are available. This technique has the interesting side effect of making both floppy disks spin, even when only one of them is being accessed. However, the price is right and this was a relatively common modification. Once the modification was done the drive cable would be replaced and a second drive would be attached. The second drive has to sit outside of the system, usually in its own enclosure complete with a separate power supply. (The separate power supply is needed because the PCjr barely has enough power inside it for its own uses.) The software patch applied to the DOS boot diskette is crude – it just bumps the count of drives on the system. BIOS only looks for one drive, so BIOS doesn’t tell DOS if more than one drive is available. This c
