3020

3020 is the STC magtape controller.

Introduction
What does it do?

Switches and indicators
Indicators, from top of the card Device number thumbwheel switch Other positions are unused.
 * Error - red LED - indicating an error
 * RFT - green LED - ready for transfer
 * RDYS - green LED - ready status from formatter - selected drive is ready
 * HDENS - yellow LED - high density 6250 BPI (CGR)
 * DMAIN - yellow LED - DMA input - read from magtape
 * DMAOUT - yellow LED - DMA output - write to magtape
 * 2 - Magtape system 1, device no. 520, Ident 3
 * 3 - Magtape system 2, device no. 530, Ident 7

Connectors
The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.

I/O Devices on the card
none?