The System Manual of SOL-20 - History of Computers

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PROCESSOR TECHNOLOGY CORPORATION Sal-PC SINGLE BOARD TERMINAL COMPUTER TM SECTION III 3.6.4 Modification for 625 Line Video The European televisions standard defines a raster of 625 lines at a field rate of 50 Hz. The horizontal rate of the U.S. standard, 15,750 Hz., is maintained. Only the number of scan lines on the screen is increased. The Video Display Generator section may be modified f or the 50 Hz. standard by following the additional steps below. The effect of the modification is to increase the modulus of the counter U62 to eight during VDISP. This results in four extra character lines (52 scan lines) between the bottom and top of the display area, for a total of 312 scan lines per field and 624 scan lines per frame. The field rate should be close enough to 50 Hz. to reduce any swim effects to less than 0.1 Hz. Some difficulty may be encountered in obtaining centering of the display within the frame. This is because the stand-off time to VSYNC from the bottom of the display is unchanged from the 60 Hz. standard. If objectionable, increase the value of resistor Rl00 which is in series with the VPOS control. To convert for 50 Hz., perform these additional steps: ( ) Locate U62 on the component side legend. Find pin 5 of this IC on the component (front) side of the board. Cut the “V”-shaped trace connecting pin 5 to the nearby pad designated “AF”, using a sharp exacto blade or scribe, so that there is no continuity between these pads. ( ) Bend a small piece of bare wire, such as a resistor clipping, into a loop to form a jumper between pad “AF”, and the adjacent pad “AG”. Insert the jumper, pull close to the board, solder, and trim the leads. If this modification is made, change the schematic, X-18, to show that pin 5 of U62 now connects to pin 4 (ground), instead of pin 6 as shown. III—40
IV PERSONALITY MODULE ASSEMBLY 4.1 Parts and Components . . . . . . . . . . . . IV-1 4.2 Assembly Tips . . . . . . . . . . . . . . . IV-1 4.3 Assembly Precautions . . . . . . . . . . . . IV-1 4.4 Required Tools, Equipment and Materials . . IV-1 4.5 Orientation . . . . . . . . . . . . . . . . IV-1 4.6 Assembly-Test . . . . . . . . . . . . . . . IV-2 4.6.1 Circuit Board Check . . . . . . . . . IV-2 4.6.2 Assembly-Test Procedure . . . . . . . IV-2
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Sol SYSTEMS MANUAL, 6200 Hollis Str
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CONTENTS OUTILNE Detailed contents
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Sol TERMINAL COMPUTERTM FIGURE 7-5
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PROCESSOR TECHNOLOGY CORPORATION So
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VIII THEORY OF OPERATION 8.1 INTROD
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SECTION IX SOFTWARE Sol TERMINAL CO
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M0100 SOLOS (tm) /CUTER (tm) USER'S
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P R E F A C E This manual describes
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TABLE OF CONTENTS (cont.) IV. SET C
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INTRODUCTION (cont.) Only the first
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II. CONSOLE COMMANDS Console Comman
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III. TAPE COMMANDS Tape commands ar
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III. TAPE COMMANDS (cont.) Note: A
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V. SET COMMANDS (cont.) The Output
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V. SET COMMANDS (cont.) The Custom
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V. SUBROUTINES A. Introduction to t
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V. SUBROUTINES (cont.) JUMP TABLE A
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V. SUBROUTINES (cont.) AOUT entry p
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V. SUBROUTINES (cont.) When calling
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V. SUBROUTINES (cont.) SOLOS provid
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VI. LOADING & EXECUTING CUTER (Appl
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