NORD-1 boards

This is an incomplete compilation of known boards used in the NORD-1 series of computers.

Card cages in a NORD-1.

There is a lot of different boards used in the NORD-1 computer. Most are numbered with a three digit code starting at 101 and at least going up to 504. The NORD-1 was one of the first computers to be constructed of integrated circuits instead of transistors. Almost all of the boards are built with the 74-series IC:s.

Table of NORD-1 Boards

Board	Drawing	Name	Notes
90N00	2B01	Data Inverter
90N04
90X08
90N40	2B01	Register Enabling
101	2A01	Bus memory
102	2A02	Register I
103	2A03	Arithmetic
106	2A06	Interrupt Register
108	2A08	Register II
109	2A09	Register control
110	2A10	Panel buffer
113		I Card reader contr. (duplex)
115	2A15	Arithmetic control
119		Unknown
120/II	2A20/II	I/O control
122	2A22	Assembler
123	2A23	Cycle counter
124	2A24	Counter control
125	2A25	Shift counter
126	2A26	Shift control
127	2A27	Control flip-flops
128	2A28	Protection check
130	2A30	Addressing control
131	2A31	Addressing control
132	2A32	Interrupt control
133	2A33	Bit instruction
134	2A34	Floating control
135	2A35	Floating control
136	2A36	Floating control
137	2A37	Floating control
140	2A40	Lamp register
141	2A41	Protection
145
146	2A46	Register transfer
150	2A50	Register
151	2A51	Time counter
157	2A57	Teletype control
158/II	2A58/II	Memory buffer
159	2A59	Memory OR
160		Simplex control
160/II	2A60	Simplex control
163/II	2A63	I/O output and clock
164	2A64	Reader buffer
165	2A65	I/O Input
166	2A66	I/O Output
168	2A68	Channel interface
169	2A69	Cambridge control
170	2A70	Duplex buffer
179	2A79	Punch buffer
180/III		Device instructions
181/II		Cartridge disc 7/8 register
182		Data channel register
183/II		Data channel counters
184	2A84	I/O Output
185	2A85	Line driver/receiver
186	2A86	I/O data board
187	2A87	I/O Input
188	2A88	Paging buffer
189	2A89	Interface buffer/cable
190	2A90	Cable card
191	2A91	I/O expander
194	2A94	Memory buffer driver
195		Duplex Start-stop buffer
196		GH 1101-J control
301		Reader buffer
302		Centronics interface
305		Memory control
309		Cartridge disc transmit
310		Cartridge disc receiver
311		Cartridge timing
312		Cartridge sequence
313/II		Cartridge control
503	1A03/II	Data ch. driver
504	1A04/II	Cable card Bus receiver
512		Unknown
7316		Expander

References and sources

• HARDWARE MANUAL NORD 1