PC87310 datasheet(40/52 Pages) NSC

Part #	PC87310

Description	PC87310 (SuperI/OTM) Dual UART with Floppy Disk Controller and Parallel Port

PDF	52 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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40 / 52 page

40 Functional Description (Continued)

47 GAME PORT

471 PC87310 Interface to the AT Game Port

To interface with the game port all that is required is the

logic shown in

Figure 8 and the qualification of the read and

write signals Since the PC87310 provides the game port

chip select (GPEN pin 18) the game read and game write

signals can be easily qualified by gating GPEN with IOR and

IOW A typical game port circuit is shown below (The game

port is implemented by using a 74LS244 buffer NE558

Quad Timer and some resistors and capacitors)

472 PC87310 Interface to the XT Game Port

This interface is essentially the same as for the AT except

that the game port read and write signals are qualified on

the PC87310 These qualified read and write signals are

provided from the PC87310 via the GRD and GWR signals

directly This eliminates the need for 2 OR gates in the ex-

ternal game port logic

TLC10591 – 19

FIGURE 8 AT Game Port

PC87310 Datasheet(PDF) 40 Page - National Semiconductor (TI)