1.4.1.5 - Norsk Data hardware - ND-100

Description

• The SMD disc controller is split over two cards, control and data. This card is handling all the data transports to/from memory.
• Using 16 pieces of SRAM chips, 4096 x 1 bits x 16 pieces (total 8 KB).
• Print: C   ECO: BE
• Print: H   ECO: BE
• Print: M   ECO: BE
• Print: P   ECO: BE
• Print: R   ECO: BE
• PCB size 367 x 280 mm, 4 layers
• Release date xx. xxx. xxxx

Chipset

• 300012 PROM microprogram
  • 01200B
• AM2942 - Programmable counter/timer/DMA address generator x 3 pieces
• AM25LS2521 - Eight-bit equal-to comparator x 2 pieces
• AM25LS2569 - Four-bit up/down counters x 9 pieces
• D2147 or
  HM6147 or
  SY2147 or
  TMS2147 - SRAM x 16 pieces

LEDs

• LD3 (red) - Error
• LD2 (yellow) - On cylinder
• LD1 (yellow) - Start

Straps

• None

Switches

• TH1 (J9) - Device number (missing entries are illegal):
  

  No.	Device name	Device no.	Ident.	Log. dev. no.
  4	Big disk system 3	540B	2B	565B
  5	Big disk system 4	550B	6B	566B
  8	Big disk system 1	1540B	17B	1100B
  9	Big disk system 2	1550B	20B	1207B

Connectors

• (A) Control lines
• (B) Data lines
• (C) Standard ND-100 system bus