DWP 220 (260-1278) Print Wheels Faxback Doc. # 4468 When setting up the DWP-220, always be sure you pick a level, sturdy location with plenty of room for easy paper flow. PRINT WHEEL CARTRIDGE INSTALLATION/REMOVAL The DWP-220 package includes a Courier 10 print wheel which you will need to install before printing. Radio Shack carries a number of different print wheel cartridges for printing different font styles. These include: * US ASC Courier 10 (10 pitch) (26-1230) * US ASC Letter Gothic 12 (12 pitch) (26-1231) * US ASC Venezia P.S. (Proportional Space) (26-1232) TO INSTALL THE PRINT WHEEL CARTRIDGE: Remove the ribbon cartridge if installed. 1. Pull the front carrier lever toward you. 2. Hold the front, left portion of the print wheel cartridge with your thumb and forefinger and insert it into the cartridge holder on the front carrier. 3. Push the front carrier lever back towards the platen. TO REMOVE THE PRINT WHEEL CARTRIDGE: 1. Pull the front carrier lever toward you. 2. Grasp the left front portion of the print wheel between your thumb and forefinger and lift it up. EXTERNAL PROGRAM MODE On some print wheels, you'll need to externally control the following: * Spacing between Proportionally Spaced characters. * Amount of ribbon feed. * Printing impression level. The print wheels that require external programming will be labeled REQUIRE SPECIAL PROGRAMMING on the packaging material. Each print wheel cartridge package will contain external programming code information. To enter the External Program Mode, send a CHR$(27);CHR$(24). Then send a two-byte code for each character or symbol. * The first byte is the ASCII code for the character. * The second byte contains the data specifying the printing format (i.e., printing impression level, ribbon feed, and pitch). IMPORTANT NOTE! This must be done for each character during the External Program Mode or an error will occur. Table 6 describes printing impression levels, Table 7 shows Ribbon Feed, and Table 8 details spacing between Proportionally Spaced characters. Note that these tables list binary values. You'll need to combine the binary values and then convert the binary values (using the Base Conversion Chart in your Tandy Computer Owner's or Reference manual) to a decimal value. Then send that decimal value to the Printer with CHR$( ). For example, the letter T requires 1/10" spacing, normal ribbon feed and printing impression level 4. Looking at Table 8, you'll see the 1/10" spacing is binary 0110. Table 7 shows you that normal ribbon feed is binary 1 and Table 6 shows that printing impression level 4 is binary 100. Adding these values together produces a binary value or 01101100 (0110 + 1 + 100 = 01101100). By referring to you Base Conversion Chart in a Tandy Computer owner's or reference manual, you'll see that binary 01101100 is equal to decimal 108. Therefore, if you send a CHR$(84);CHR$(108) from BASIC to the DWP-220, the letter T will be printed. To exit the External Program Mode, send CHR$(27);CHR$(25) from BASIC. ┌────┬───┬───┬───┬───┬───┬───┬───┐ │ D8 │D7 │D6 │D5 │D4 │D3 │D2 │D1 │ ├────┴───┴───┴───┼───┼───┴───┴───┤ │ PS UNIT set │RF │ │ ┌────>│ (Available in │set│Hammer set │<────┐ │ │ PS mode only) │ │ │ │ │ └────────────────┴───┴───────────┘ │ │ /\ │ TABLE 8. v │ TABLE 6. v ──────────────────────────────────┐ │┌─────────────────────────┬───┬───┬─── UNIT AMOUNT (A/60") D8 D7 D6 D5 │ ││ HAMMER IMPRESSION LEVEL │D3 │D2 │D1 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 0 (print without 0 0 0 0 │ ││ 0 │0 │0 │0 Carriage Movement) │ ││ │ │ │ ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 1 0 0 0 1 │ ││ 1 │0 │0 │1 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 2 0 0 1 0 │ ││ 2 │0 │1 │0 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 3 0 0 1 1 │ ││ 3 │0 │1 │1 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 4 0 1 0 0 │ ││ 4 │1 │0 │0 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 5 0 1 0 1 │ ││ 5 │1 │0 │1 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 6 0 1 1 0 │ ││ 6 │1 │1 │0 ──────────────────────────────────┤ │├─────────────────────────┼───┼───┼─── 7 0 1 1 1 │ ││ (no hammer action) │1 │1 │1 ──────────────────────────────────┤ │└─────────────────────────┴───┴───┴─── 8 1 0 0 0 │ │ TABLE 7. ──────────────────────────────────┤ │ ┌──────────────────────┬─────┐ 9 1 0 0 1 │ │ │ RIBBON FEED AMOUNT: │ D4 │ ──────────────────────────────────┤ │ ├──────────────────────┼─────┤ 10 1 0 1 0 │ └────>│ Normal │ 1 │ ──────────────────────────────────┤ ├──────────────────────┼─────┤ 11 1 0 1 1 │ │ Long │ 0 │ ──────────────────────────────────┤ └──────────────────────┴─────┘ 12 1 1 0 0 │ ──────────────────────────────────┤ 13 1 1 0 1 │ ──────────────────────────────────┤ 14 1 1 1 0 │ ──────────────────────────────────┤ 15 1 1 1 1 │ ──────────────────────────────────┘ (abo/tmc-09/21/95)