3020

3020 is the STC magtape controller.

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Introduction

What does it do?

Switches and indicators

Indicators, from top of the card

• 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

Device number thumbwheel switch

• 2 - Magtape system 1, device no. 520, Ident 3
• 3 - Magtape system 2, device no. 530, Ident 7

Other positions are unused.

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?

ECO

Here is a list of known ECO's (Engineering Change Order) for this card.

• ECO 100-771 - Wrong data is written to tape due to short pulse BUDAT-1

Reference

• Norsk Data Document ND–06.015.02 ND-100 FUNCTIONAL DESCRIPTION
• Norsk Data Document ND–30.008.3 EN ND-100 Hardware Maintenance