# HG changeset patch # User Paul Boddie # Date 1484682642 -3600 # Node ID 0a0835dce5c0c810b18c9599954466f1b9d8cdbd # Parent b6cce10eaada37679f6e4d242b7d4e331eadf605 Added PCB dimension details and board outline workflow. diff -r b6cce10eaada -r 0a0835dce5c0 CartridgePCB/README.txt --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CartridgePCB/README.txt Tue Jan 17 20:50:42 2017 +0100 @@ -0,0 +1,79 @@ +Files +----- + +The cartridge_board_measurements.svg file was converted to the form defined by +cartridge_board.svg by removing dimension details, setting stroke widths to 0 +for all objects, converting shapes to paths, performing a union operation on +the main board shape with the rectangles providing material for the edge +connector curvature (see below), then using the difference operation to remove +all cutout shapes. This should leave a single path object defining the board +minus the cutouts. + +The cartridge_board_rear.svg file takes the board shape, flips it +horizontally, and converts all curves to lines by adding more points (three +times appears sufficient) and then using the curve-to-line operation. This +file is then exported to DXF (version 14) and produces the +cartridge_board_rear.dxf file. + +Importing the cartridge_board_rear.dxf file into KiCad with the connectors +aligned to a 0.127mm grid, the offsets 60.445mm (3in - 15.755mm) and 127mm +(5in) can be used. The DXF file is suitable for designs where the rear of the +board is the focus, typically because that is the side on which components +will be mounted. + +PCB Measurements +---------------- + +The cartridge_board_measurements.svg file summarises the details below. + +ROM cartridge board width is 84.85mm, height is 62.5mm. + +Mounting holes are at 4.975mm and 79.875mm horizontally with small holes +having a radius of 1.6mm and large holes having a radius of 3.75mm. Small +holes appear at 5.875mm and 45.875mm from the top of the board (56.625mm and +16.625mm from the bottom). Large holes appear at 36.875mm from the top of the +board (25.625mm from the bottom). + +Two mounting slots of 2.2mm width are centred on 14.825mm and 70.025mm +horizontally. The front left (rear right) slot starts at 23.475mm from the top +of the board (39.025mm from the bottom) and ends at 35.575mm (26.925mm), then +being extended by a circular cutout of 1.1mm radius. The front right (rear +left) slot starts at the same vertical location but ends at 33.075mm +(29.425mm), being extended by the 1.1mm radius cutout. Thus, it is 2.5mm +shorter. + +Edge Connector Pads +------------------- + +Edge connector width is 56.5mm, height is 11.85mm. + +The edge connector on the Advanced Computer Products cartridges (and +presumably the Acorn ones) curves into the lower edge of the main board area. +This curvature has a 1.1mm radius. + +AppNote-014.pdf indicates that "Cartridges plug into a 44 way gold plated edge +connector arranged on each side of a 0.05 inch slot as 22 ways of 0.05" x 0.5" +on 0.1" centres." + +Note that 2.54mm = 0.1in. Thus, "0.1" centres" indicates a spacing of 2.54mm. +The connectors are therefore 1.27mm x 12.7mm. The slot is 1.27mm (0.05in) +wide, presumably requiring such a board thickness. + + 1.58mm margins from the edges to the centre of the first connector + + 2.54mm between the centres of each connector + + 22 connectors gives... + + (22 - 1) * 2.54mm + 2 * 1.58mm = 56.5mm + +The edge connector has an offset of 14.175mm from the left edge of the board. + + (84.85mm - 56.5mm) / 2 = 14.175mm + +The first connector has an offset of 15.755mm from the left edge of the board. + + 14.175mm + 1.58mm = 15.755mm + +The base of the connectors has an offset of 62.5mm from the top of the board, +being the base of the board. diff -r b6cce10eaada -r 0a0835dce5c0 CartridgePCB/cartridge_board.svg --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/CartridgePCB/cartridge_board.svg Tue Jan 17 20:50:42 2017 +0100 @@ -0,0 +1,183 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + image/svg+xml + + + + + + + + + diff -r b6cce10eaada -r 0a0835dce5c0 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