| 摘要 |
A teletext decoder is provided with a page memory having rows (R0 to R73) for storing corresponding packets of teletext data, the page memory being provided with at least one extra memory bit (F1, F2) for each row thereof, the extra memory bits constituting flags (F1, F2) which may be selectively set by the processor software in order to initiate selective action in respect of those packets which correspond to the flagged rows. The selective action might be to permit or prevent packets being written into memory or to alert the processor that immediate processing of a flagged packet is required.
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