The IBM Prototype Card is 106.7 millimeters (4.2 inches) high by 335.3 millimeters (13.2 inches) long and plugs into an expansion unit or system unit expansion slot. All system control signals and voltage requirements are provided through a 2- by 31-position card-edge tab.
The card contains a voltage bus (+5 Vdc) and ground bus (0 Vdc). Each bus borders the card, with the voltage bus on the back (pin side) and the ground bus on the front (component side). A system interface design is provided on the Prototype Card.
The Prototype Card can also accomodate a D-shell connector if it is needed. The connector size can range from a 9- to a 37-position connector.
The following is a block diagram of the IBM Prototype Card.
The Prototype Card has two layers screened onto it (one on the front and one on the back). It also has 3,909 plated through-holes that are 10.1 millimeters (0.040 inch) in size and have a 1.52-millimeter (0.060-inch) pad, which is on a 2.54-millimeter (0.10-inch) grid. There are 37 plated through-holes that are 1.22 millimeter (0.048 inch) in size. These holes are at the rear or the card (viewed as if installed in the machine). These 37 holes are used for a 9- to 37-position D-shell connector. The card also has 5 holes that are 3.18 millimeters (0.125 inch) in size. One hole is located just above the two rows of D-shell connector holes, and the other four are located in the corners of the board (one in each corner).
The component side has two ground bus, 1.27 millimeter (0.05 inch) wide, screened onto it, and card-edge tabs that are labeled A1 through A31.
The component side also has a silk screen printed on it that is used as a component guide for the I/O interface.
The pin side has a +5-Vdc bus, 1.27 millimeter (0.05 inch) wide, screened onto it, and card-edge tabs that are labeled B1 through B31.
Each card-edge tab is connected to a plated though-hole by a 0.3-millimeter (0.012-inch) land. There are three ground tabs connected to the ground bus by three 0.3-millimeter (0.012-inch) lands. Also, there are two +5-Vdc tabs connected to the voltage bus by two 0.3-millimeter (0.012-inch) lands.
For additional interfacing information, refer to "I/O Channel Description" and "I/O Channel Diagram" in your Technical Reference system manual. If the recommended interface logic is used, the following list of TTL-type numbers will help you select the necessary components.
| U1 | 74LS245 | Octal Bus Transceiver |
| U2, U5 | 74LS244 | Octal Buffers Line Driver/Line Receivers |
| U4 | 74LS04 | Hex Inverters |
| U3 | 74LS08 | Quadruple 2 - input Positive - AND Gate |
| U6 | 74LS02 | Quadruple 2 - Input Positive - NOR Gate |
| U7 | 74LS21 | Dual 4 - Input Positive - AND Gate |
| C1 | 10.0 uF Tantalum Capacitor | |
| C2, C3, C4 | 0.047 uF Ceramic Capacitor |
System Loading and Power Limitations
Because of the number of options that may be installed in the system, the I/O bus loading should be limited to one Schottky TTL load. If the interface circuity on the card is used, the this requirement is met.
Refer to the power supply information in your Technical Reference system manual for the power limitations to be observed.
If a connector is required for the card function, you should purchase one of the recommendes Amp connectors listed in the following table, or its equivalent.
| 9-pin D-shell (Male) | 205865-1 |
| 9-pin D-shell (Female) | 205866-1 |
| 15-pin D-shell (Male) | 205867-1 |
| 15-pin D-shell (Female) | 205868-1 |
| 25-pin D-shell (Male) | 205857-1 |
| 25-pin D-shell (Female) | 205858-1 |
| 37-pin D-shell (Male) | 205859-1 |
| 37-pin D-shell (Female) | 205860-1 |
The following example shows hoe a 15-pin, D-shell, female connector is attached to a prototype card.
(Click on image to enlarge)
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Cette page a été retranscrite par Nicolas Marchildon