Table:
Acorn Microcomputer

Upper board, featuring keypad and LED display.

Developer	Acorn Computers
Type	8-bit semi-professional
Release date	March 1979; 45 years ago (1979-03)[1]
Introductory price	£65 (kit), £75 (assembled)[2]
CPU	6502 @ 1MHz
Memory	1.125K
Storage	CUTS cassette tape interface
Display	LED
Graphics	-
Sound	-
Input	25-key keypad
Controller input	-
Connectivity	INS8154 RAMIO Expansion chip (optional), CUTS cassette tape interface, socket for optional additional ROM/EPROM
Power	7.5V+ from external PSU through onboard 5V regulator
Dimensions	160 x 100mm two stacked boards
Successor	Acorn System 2, Acorn Atom

Different merged cells often exist in a table and they can be represented by the JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}. In this JSON item, '(X1, Y1)' and '(X2, Y2)' are the (row_id, column_id) coordinates for the top-left and bottom-right cells in the merged region, respectively. Please examine the provided table image, identify all merged cells, and return their details using the above-mentioned format. Remember, the numbering for both rows and columns starts at 1.

This table does not contain any merged cells.