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Sinclair ZX81, Assembly Instructions Manual, Page: 30 / 43

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Sinclair ZX81 Assembly Instructions Manual Download Page 30

Summary of Contents for ZX81

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Page 2: ...n the kit but they are all fairly expensive items and most of them are susceptible to damage from static electricity There is no cause for worry if a few precautions are taken a Use the sockets suppli...

Page 3: ...shown by the picture printed at their positions i e with their rounded corners facing the edge connector e The jack sockets and modulator need to have their business ends i e where the plug goes in f...

Page 4: ...s need more detailed explanation a The capacitors are represented by a capacitor symbol on the board rather than a box as the rest of the components are Fig 7 explains how they fit in the board relati...

Page 5: ...y and that the plug is in the right socket the one nearest the keyboard Otherwise look at the connection to the T V and make sure it is tuned in properly try between channels 33 and 39 UHF b If the co...

Page 6: ...the keyboard correctly the first time to avoid damaging it by continual relocating Locate the top edge of the keyboard against the top edge of the recess and stick it down carefully working gradually...

Page 7: ...lue Markings Comments RP1 8 x 10K 10KQ 9 leads RP2 Not used RP3 5 x 10K 10KQ 6 leads c Capacitors No Values Markings Comments C1 47pF 47 Ceramic disc C2 47nF 473 Z C3 22uF 22 H Electrolytic 16V mm C4...

Page 8: ...e 3 5mm jack plug Need not be regulated but should be well smoothed Voltage between 12 volts maximum and about 8 volts minimum depending on smoothing when on load Current not less than 600mA or 1 2A o...

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Page 13: ...ug 60p OA 91 diode 9p 16 pin Header with 24 Cable Open ended 180p 0 2 LED RED 13p Low current Solid State Buzzer lOOp 0 2 LED GREEN 15p 6 Volt Relay Single pole change over contact rating 1A 120V AC 2...

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Page 15: ...2K 6 chips it to be placed diately above 17 MESA 14K chips the memory on the memory board without 18 Ecohere le 2X81 RAM disabled any gaps and used normally 19 Unused 20 Unused BSS Memory Board Block...

Page 16: ...bit 15 to differentiate between 16K blocks Please refer to Appendix B for Jaoatiiogs suujjjzh setting abbreviations Note In the following table of switch settings NCroeand No eh iage from the correct...

Page 17: ...to align the pins to the socket holes ie getting then straight in line with the rigtfa distance between the rows by grasping the chip firmly by the ends botwe thumb and forefinger and pressing a row...

Page 18: ...ctionsuppermost and towards you position the memory board over the ZX81 board with the 40 protruding pins lying directly over the CPU on the ZX81 This is the position of fitting which you should now r...

Page 19: ...ten it again without breakage If one breaks then there is nothing for it but the soldeeing iron1 iv Find out the contents of RAMTOP s e ZX8l manual if interested as follows Type in PHIHT PEEK 16389 th...

Page 20: ...yboard half of case in the correct positions Note that in this situation the first five memory sockets are accessible as we l as all 26 positions of the plug and socket switches Replace the bottom hal...

Page 21: ...y to uee a machine code subroutine and complete programs for this on both 2X60 and 81 are given in tha applications notes and in PCW B _ r iiAi _MVIA l ll R IIVH I fc l I 17 BURNLEY ROAD LONDON NWIO I...

Page 22: ...he edga connector pins towards each other so that the card Just fits between them Then position the card between them as in Figa 7 and 8 The card should he positioned with notch outwards i e away from...

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Page 28: ...instructions right through before doing anything else Supplied by EAST LONDON ROBOTICS Finlandia House 14 Darwell Close East Ham LONDOS E6 4BT CONTENTS 1 FITTING FITTING REMOVING FITTING OF ADDITIONAL...

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Page 31: ...13 114 115 116 117 118 119 120 121 122 123 124 125 126 127 8 128 129 130 131 132 133 134 135 136 137 136 159 140 141 142 145 2 144 145 146 147 146 149 150 151 152 155 154 155 156 157 158 159 A 160 161...

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Page 34: ...40 white keytops and push on firmly Take the legend set and place it on a firm card Using a Steel rule and a sharp knife cut out the letters using the edge markers as guides You may prefer to draw fai...

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Page 37: ...lue Markings Comments RP1 8 x 1QK I OK 2 9 isads RD2 Not iispd RP3 5 x 10K 10KS 6 leads c Cdpacitors No Values Markings Comments Cl 47pF 47 Ceramic disc C2 47nf 473 Z C3 22 iF 22 t Electrolytic 16V mm...

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