Chilton::ACL::SPROGS Technical Paper

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Applications Associates Literature Society Technology Software revisited

Early history □ Minutes of committee meetings □ Progress reports □ Other reports □ News cuttings □ In-house publications □ Committee papers □ Personal recollections □ ACL publications □ Books □ Early Atlas publications □ FR80 reports □ Atlas manuals □ ICL1906A manuals □ Other manuals and papers

General □ Applications Software Group □ Basic Software Group □ FR80 □ FR80 operations □ FR80 project notes □ FR80 technical notes □ FR80 user notes □ Graphics □ Graphics Section □ Graphics Notes □ Graphics User Notes □ PDP15 □ PDP15 Notes □ SPROGS □ SPROGS Technical Notes □ SPROGS Papers □ SPROGS Notes

SPROGS Technical Paper No 25: Tektronix on-line graphics using SPROGS

R E Thomas

3 September 1974

It is possible to write directly to the Tektronix, and read the crosshair coordinates, using SPROGS. Such a job must have a MOP core image, which entails:

(a) CONNECTing to a SPROGS background job, since the macro issues a background job in MOP context.

(b) Getting permission from Operations to use the MOP slot. The job must ONLINE TP0 for output and TR0 for input.

Output

SPROGS normally writes an ALLCHAR file which will be listed later at the terminal. A GEORGE mod has enabled 3-shift working for online TP, so the connection of TP0 to the terminal will produce immediate graphic response.

Input

The SPROGS routine:

      TKREAD (CH,X,Y)

requests via TP0) that the cross-hairs be displayed. These can be repositioned using the thumb-wheels on the Tektronix. Typing any character will turn off the cross-hairs and send (as an extra 4 characters) the X, Y coordinates of the cross-hairs to the 1906A. ACCEPT (CTRL SHFT K) must be pressed also, so that NOP accepts the line. The character (in SPROGS code) and X, Y coordinates (as numbers) are returned in the routine arguments.

This facility has been made possible by a mod to GEORGE which suppresses the transmission of CARRIAGE RETURN at the end of any line for online ALLCHAR output. Note that, if more than one character (or a non-alpha shift character) is typed, the extra characters will be read by the next call of TKREAD, and erroneous X,Y coordinates will result. Also, the MOP TIME OUT is still in force, and this may lead to false information on RESTART.

Example

User program PROGRAM TKRN has already been consolidated and saved.

RJ RETMO,:SPROGS.SPROGS,#TP0,#TR0,RUN PROGRAM TKRN 
CN RETMOP 
CU

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