1990 Era computer room
wulfman at wulfman.com
Wed Jun 24 11:50:39 CDT 2015
ahh the memorys i worked at dataproducts from late 1978 to late 1980
they were awesome printers the B series used the 2900 series bit slice
they were speed daemons for their time
its too bad that manufacturing in the USA has dropped because of cheap
we may still have great companys like that making things here in the USA
On 6/24/2015 9:33 AM, J. David Bryan wrote:
> On Tuesday, June 23, 2015 at 22:14, jwsmobile wrote:
>> Also I don't recall the Data Products ever scaling as fast by
>> restricting columns. At least our 2230, 2260 and 2290 UC only and 96
>> character set printers didn't. Got the same speed regardless of the
>> columns on those Data Products printers.
> The HP 2767A service manual (02767-90002, available from Bitsavers) is a
> reprint of the Data Products 2310 service manual. Page 1-17 says:
> "The printer receives data from the user system and stores up to 20
> characters in the buffer memory. [...] A full line of data is
> printed in four zones, each zone having 20 consecutive print
> positions. In this manner, the printer's 20 hammer drivers can be
> time-shared among the 80 print positions."
> ...and the spec on page 1-5 says the print rate for the 64-character drum
> is 356 lines per minute for 80 columns, 460 lpm for 60 columns, 650 lpm for
> 40 columns, and 1110 lpm for 20 columns.
> I tested a 2767A as a customer of the HP Rockville, MD office in the early
> 1970s. As I recall, the character set wasn't staggered on the drum, and
> the hammer force was constant, regardless of glyph area. The result of
> printing a line of hyphens -- or worse, a line of periods -- was a very
> loud bang and a neatly perfed page.
> -- Dave
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