BLUE CHIP 128 MODEL BCD/128 DISK DRIVE aka AMTECH 6-18-2012.
BLUE CHIP 128 MODEL BCD/128 DISK DRIVE aka AMTECH FCC ID E2550FFD-168 latest updates and/or corrections 6-18-2012 This drive is a clone of the Commodore 1571 and uses the same CBM DOS ROM V3.0 code in its 27256 socketed EPROM. It therefore has the same "1541 disk read slow access" bug. The CBM upgrade V3.1 and JiffyDOS for the 1571 will work in this drive. The mechanism is labeled "Asia Commercial Co. Ltd. FD-108". It features a direct drive motor (no belt) and a dual head like a 1571 so it can write to both sides of a disk in 1571 mode. This drive and the Blue Chip 1541 clones are powered by a transformer-only external power pack which outputs two voltages: 16VAC at 0.8A and 9VAC at 1.5A. Rectifiers, filters and regulators are all inside the drive. If I didn't have a power pack, the transformer out of a 1541 would work to supply those voltages. The four pin power connector is unique and would be hard to find, so some type of replacement connector would have to be fabricated. Here is the pinout: 9VAC -----O O----- 9VAC 16VAC -----0 O----- 16VAC The four dipswitches on the rear of the drive select the device number: __________________ | | | 4 3 2 1 | |__________________| 8 = ON ON ON ON 9 = ON ON OFF OFF 10 = OFF OFF ON ON 11 = OFF OFF OFF OFF Use a toothpick or small tool to set the switches. Never use a pencil as the conductive lead can break off and get inside the drive causing a short.