PDP11 PeripheralsHbk 1972 - Trailing-Edge
PDP11 PeripheralsHbk 1972 - Trailing-Edge
PDP11 PeripheralsHbk 1972 - Trailing-Edge
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Printer Buffer (PRB)<br />
BIT<br />
15-7<br />
6-0<br />
15 7 6 o<br />
NAME<br />
Unused<br />
Data Buffer<br />
DATA<br />
DESCRIPTION<br />
DATA BUFFER - Transfers the data from<br />
the UNIBUS to the printer. Printer holds<br />
character strobed in to print. Load only.<br />
Any instruction that could modify PRB as a byte or word clears READY and initiates<br />
printing.<br />
2.6.2 Programming Examples<br />
Read a character (from keyboard)<br />
LOOP: TST TKS<br />
BPL LOOP<br />
READ: MOV TKB; RO<br />
ECHO keyboard<br />
ECHO: TSTB TKS<br />
BPL ECHO<br />
STALL: TSTB TPS<br />
BPL STALL<br />
BR ECHO<br />
2.6.3 LA30 Specifications<br />
.printing Speed:<br />
Line Length:<br />
Character Spacing:<br />
Line Spacing:<br />
Paper:<br />
Typeface:<br />
Printing Characters:<br />
; look for DONE<br />
; Wait jf DONE = 0<br />
; Read character<br />
; Character available?<br />
; Wait if DONE =0<br />
; Is punch readyff<br />
; Wait if READY = 0<br />
30 characters per second, asynchronous,<br />
300ms carriage return<br />
30 line feedslsec<br />
80 character positions<br />
10 characters per inch<br />
6 lines per inch<br />
9718 inches wide - tractor driven continuous form<br />
original plus one copy. With adjustment. up to 6<br />
copies.<br />
5 x 7 dot matrix<br />
64 upper case ASCII subset (lower case codes print<br />
as upper case)<br />
31
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