drum printer การใช้

• A variety of medium and high-speed drum printers could be supplied.
• Together they formed a single two-part cabinet about the size of a large drum printer.
• Compared to drum printers, chain printers had the advantage that the type chain could usually be changed by the operator.
• As with the drum printer, as the correct character passed by each column, a hammer was fired from behind the paper.
• Introduced in 1963, the 3300 was a 300 line per minute drum printer that used a moving coil actuator for the print hammer.
• For drum printers, incorrect timing of the hammer resulted in printed lines that wandered vertically, albeit with characters correctly aligned horizontally in their columns.
• A further advantage was that vertical registration of characters in a line was much improved over drum printers, which needed extremely precise hammer timing to achieve a reasonably straight line of print.
• The tape transport was followed by the " 405 Card Punch ", followed by a series of tape drives and drum printers, all of which were designed in-house.
• Typical configuration was 24K words of 24-bit core memory, four 7-track tape drives, drum printer, card reader, card punch, two 8MB disc drives ( removable packs ).
• As the technology matured, most large printer installations were drum printers, a type of impact printer which could print an entire line of text at once through the use of a high speed rotary printing drum.
• Dataproducts was a typical vendor of drum printers, often selling similar models with both a full set of hammers ( and delivering, for example 600 lines-per-minute of output ) and a half set of hammers ( delivering 300 LPM ).