BA11-C Mounting Box

The BA11 is the first of a series of hex system unit backplane mounting boxes for the H960 series of 19"-wide racks produced by DEC. Although they were intended to be rack-mounted, they were available in table-top configuration as well.

The H960 racks provided 63" of vertical mounting space, divided into units of 10-1/2", which were further subdividable into a pair of 5-1/4" spaces. The 10-1/2" tall BA11 mounting box was designed for these spaces.

BA11's come in both 'basic box' and 'expansion box' models; the former contains the KA11 processor, and has a programmer's console front panel, and the latter is used to hold extra core main memory systems (each in their own custom system unit) and other devices, and has a blank front panel.

The BA11 came with the H720 Power Supply. The supply was mounted transversely at the rear of the box.

The system units were also mounted transversely, but because the cooling fans were mounted along the side of the box, it could not hold extended-length hex-height cards; only shorter (lower) modules, such as the M920 UNIBUS Jumper, could be placed in the A-row connectors.

The BA11's dimensions were 10-1/2" high, 19" wide, and 23" deep; the H720 was 8" high, 16-1/2" wide, and 6" deep, and weighed 30 lbs.