APPENDIX B — SCS/DCA COMMAND SUMMARY | Page | |
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Command: | Begin Overstrike (BOS) |
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Format: | 2B D4 nn 72 ch bp gcgc cpcp |
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Printers: | 3812, 5219 |
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Action: | Starts character overstrike mode. After a Begin | |
| Overstrike command is received, all characters printed | |
| (except bypassed characters), are overstruck until an End | |
| Overstrike command is received. |
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| The ch parameter is the character to use for overstriking. | |
| The bp parameter specifies the set of characters for | |
| which to bypass overstriking. Valid values are 00h | |
| (bypass horizontal tab and indent tab commands), 01h | |
| (continuous underscore) and 80h (bypass space, | |
| horizontal tab, indent tab and relative horizontal print | |
| position commands). |
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| The gcgc and cpcp parameters are not used or inspected | |
| by the 3812 or 5219, but both gcgc and cpcp should be | |
| zero (0000h). |
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| Overstrike mode, once activated with the Begin | |
| Overstrike command, is deactivated by either the End | |
| Overstrike or Set Initial Conditions commands. | |
IBMEMUL: | Same as IBM. |
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275EMUL: | No operation. |
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Command: | End Overstrike (EOS) |
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Format: | 2B D4 nn 76 |
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Printers: | 3812, 5219 |
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Action: | This command ends the character overstrike mode | |
| enabled by Begin Overstrike (BOS). |
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IBMEMUL: | Same as IBM. |
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275EMUL: | No operation. |
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