Accessing Files Programmer's Guide (32650-90885)

62 Chapter2

Creating A File

Specifying Record Size

Figure 2-5. Record Placement for ASCII Files

Rather than specify your own record size, you can accept the default record size for the

device that you are using. Default record sizes are listed in Table 2-5. on page 62 Note that

subsystem defaults may be different from MPE defaults; for example, the Editor default

may be 72 or 80 bytes (depending on text format) while the MPE standard default is the

record size conﬁgured for the device.

Table 2-5. Standard Default Record Sizes

DEVICE RECORD SIZE (BYTES)

Disk 256

Magnetic Tape Unit 256

Terminals (most cases) 80

Line Printer 132

Plotter 510

Programmable Controller 256

Synchronous Single-Line Controller 256