TSS DISPLAY.DRIVER. User Screens

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1 TSS DISPLAY.DRIVER The purpose of the display driver is two fold; 1) To allow users and the system to communicate with the operator through the display console. 2) To provide access to system information, core, and ECS.from the console as a debugging aid. Displays are made up of logical displays which may be selected by the operator for viewing on either screen. Communication is accomplished through a logical display known as a user display. A use,r display is a display buffer (an ECS file) which may be written into by the user and will be coppied onto the screen by the PPU when selected by the operator. In addition, there are core/ecs displays and PPU composed displays (clocks, etc ) User Screens Each user screen consists of a display buffer an Event channel and a message buffer. The display buffer consists of 32 eight word line buffers. Each line buffer consists of a one word header and seven data words.

2 ..J display buffer.. II line buffer u.... l - ' ".. line buffer heade data header word _J/_/_/_/_/_f_b_r1_te...-_fc_n_f_ct_j} message buffer O header or fla~ message i 7 -

3 Brite is the relative brightness of the line buffer on the screen. It ranges from 1 ton, where n will probably be about 5. The brightness is proportional to n.j and n = O is equili vent to n = 1. Fen function is half of the function code to be sent to the device. Only the lower 4 bits are significent. Fen= XY; where Xis the mode and Y 1s the character size as followss,,... Ct is x = 0 dot mode 1 character mode y = 0 64 characters/line (small) 1.32 charac ters/:l.1ne. (medium) 2 16 characters/line (large) the length of the. data to be output in bites. if Ct = 0, nothing is output. Data will be output verbatium, beginning with the high order byte of the word following the header word and continuing until;ct is exhausted. If Ct= O, no data in the corresponding line buffer will be output. Data is assumed to be positioning information ' and display code (or dot co-ordinates). See peripheral manuels for additional information. Keyboard Messages Operator Type-ins. Entries made by the oper~tor will be displayed in the lower left corner of the left screen.

4 Messages beginning with a slash("/") will be 1nterpeted by the PPU as a comand. Other messages will be sent by the message buffer of the display currently on the right screen. TheJ:CWill be a PPU command to enter a message into an arbitrary message buffer. Messages in the buffer will end with a console ) character ( 60B). ' The Message Buffer.The message buffer is eight words long. It has one header word followed by seven data words. The header is a busy flag. When the operator the flag will be checked. If the buffer is not busy (ie; flag= O),.th~ flag will be set, the message copied into the buffer, and an event sent on the corresponding event channel. If, however, when an attempt is made to send the message, the buffer is busy. ( flag = 0), the message "BUFFER X BUSY" (where Xis screen name) will appear on the screen. Th~ operator may then either try again ( ~ ), blank the message ( ~ ). or force the message to be stored in the buffer ( {i_or~ ). Since there exists one message buffer and one event channel for each user screen, there should be no problems. However, if several users are sharing a screen (by agreeing to write only in certain line buffers and only at certain screen co-ordinates) they must sort the messages themselves.

5 NOTE: The messages in display code, ten characters per word, left justified, and beginning with the word. following the header. e ( w1 th a console 60B}. Each message ends No -guarantees are made about zero fill. ll y ~ hoped that ~ will ~.~busy flag after receiving!: message.

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CIS-331 Fall 2014 Exam 1 Name: Total of 109 Points Version 1

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