Tandy TRS-80 Model II Service Manual Download | Manualshive

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Summary of Contents for TRS-80 Model II

Page 1: ...CUSTOM MANUFACTURED IN U S A BV RADIO SHACK A DIVISION OF TANDV CORPORATION...

Page 2: ...written permission from Tandy Corporation or any portion of this manual is prohibited While reasonable efforts have been taken in the preparation of this manual to assure its accuracy Tandy Corporatio...

Page 3: ...he Computer 7 2 5 Checking Installation 7 2 6 Enabling A Terminal 9 2 7 Disabling A Terminal 10 2 8 Model II to 16 Conversions 10 3 Theory of Operation Il 3 1 USART Circuitry Il 3 2 Baud Rate Generato...

Page 4: ...erminal Interface Board Page No Installation 4 2 2 DIP Switch Settings 5 2 3 Typical System Installation 8 LIST OF TABLES 3 1 Programming Parameters Page l of 4 12 Programming Parameters Page 2 of 4 1...

Page 5: ...transmission of any character an interrupt is created and the character is stored to or retrieved from a memory buffer The Multiterminai Interface Board is mounted in the Card Cage assembly which is i...

Page 6: ...Multiterminal Interface TRS SO S_e_r_v_i_c_e_M_a_n_u_a_l_ lIadlelllaell 2...

Page 7: ...a version 01 03 00 If you already have the XENIX Operating System it is necessary to modify it using a software update diskette Catalog No 700 2066 which modifies a 1 1 or 1 2 system to a version 01 0...

Page 8: ...E t u 0 Q ca Q Q e 0 0 c ai 0 Q E ca 0 co C ni I U cO Multiterminal co co ai c co cO en Interface Board Q Q E Q 1 0 Li Model16 Rear View 68000 CPU 16 Bit Memory 16 Bit Memory Option Video Board Multit...

Page 9: ...cover plate and pull down 2 Remove the card holding brackets from either side of the card cage to allow the Multiterminal Interface board to be installed Attach the cable end s to the connector s on...

Page 10: ...e Adds25 terminal type and expects the terminaIs you connect to be set to the DT I s Adds25 emulation mode That information is stored in a TRS XENIX file called etc ttytype If you re connecting a DT l...

Page 11: ...Channel A or B of your computer 4 If the computer requires it check the owner s manual insert a Terminator Plug into any unused SeriaI Channel If the terminal connects to one of the three connectors...

Page 12: ...v_1_ c_e M_a_n_u_a_l _ Terminal No 6 B RS 232 Cable 26 4403 Terminal No 5 Terminal No 2 T T Alternate Connection Multiterminal Interface PCB Terminal No 4 Figure 2 3 Typical Installation Multiterminal...

Page 13: ...2 6 Enabling A Terminal Before you can use a terminal it must be enabled To enable a terminal connected at SeriaI Channel A type enable ttyOI ENTER To enable a terminal connected at SeriaI Channel B t...

Page 14: ...vided sorne precautions are taken There is a dual addressing problem in early Model II VDG boards that makes ports 7CH 7FH be interpreted as ports FCH FFH This is only on Rev A and Rev B VDG boards To...

Page 15: ...s are U16 U17 and U19 3 1 1 CPU Interface Logic The CPU Interface logic links the two major parts the transmitter and the receiver with the Zao CPU The zao CPU by read write operations issues configur...

Page 16: ...3 1 2 1 1 0 0 1 1 0 1 1 1 1 t Z W J 0 J Z 0 N U e w J J J t 0 w 0 W W W en w Z Z Z Z a t en J 0 z z z w w w J u t U a a t 0 m I I a 0 z t 0 U t Il en u t 0 0 t 0 t t t I w 0 a u 0 a 0 a w w W J W W J...

Page 17: ...J U W W U 0 0 u en U a 0 Zw a w t Il Ln a Il a J t CI 0 N z t w w U 1 l Il e CI 1 0 w C e Il z J 0 1 w a e o CI z 0 0 J W a us a en a J t J a 0 1 a a t w l wO w 1 a J 1 Z CI w a w U t a J 0 W Z 1 U U...

Page 18: ...USART MODE COMMAND STATUS MODE 7 1 6 5 4 3 1 2 1 1 0 1 0 0 1 1 1 0 X M J C CD Il Il t CD CI l Il Il a Il C Il Il t ma w 0 w z 0 m J W 0 O m J ot E a l c a a ZO z J z w w t CI LI 0 z J w Z X c w t CD...

Page 19: ...1 STATUS DATA 7E 7 6 5 4 3 2 1 0 w a a a 0 0 w w m a a J W Il a z a a a J ct w J w a w a ct a t c c a c w a w a a 1 X a x x c a u 0 a Il Il Il Il Il Il Il Il LOOPBACK COMMAND LOOP8ACK COMMAND x X X X...

Page 20: ...MS IC that consists of three independent programmable counters Each counter is hard wired to a specifie U5ART The counter output is applied to the USART TX and RX clocks The frequency output of each c...

Page 21: ...500 09C4 625 0271 75 26 667 682B 1 667 0683 417 01A1 110 18 182 4706 1 136 0470 284 011C 150 13 333 3415 833 0341 208 0000 300 6 667 1A06 417 01A1 104 0068 600 3 333 0005 208 0000 52 0034 1200 1 667 0...

Page 22: ...itry data transcei er interrupt controller and clock circuitry 3 5 1 Address Decoder The address decoder determines whether or not the Z80 is addressing the Multiterminal Interface U24 is a line recei...

Page 23: ...gether to create a single interrupt per USART channel This interrupt is used to inform the CPU when a USART needs service 3 5 5 Clock Circuitry The clock circuitry has two parts First the 4 MHz clock...

Page 24: ...Multiterminal Interface _S e r_v i_c e M a n u a l lIadI8 lhael 20...

Page 25: ...5 12 V 2 OS U20Tce 7 S V 2 06 IATEI 14 I r 10WR fX 9 E I JJ E 2 I 13 08 3 V 107 OUT 1 13 pUll r 4 01 TROI 22 V 2l C s 21 RST TXRDY 1 5 l1 74lS27 16 CS 19 AD RllROY 14 4 6J 18 CS TCI 8 S 20 AI CLK2 18...

Page 26: ......

Page 27: ...11 0 R5 E3 R22 c J e r J J R1 U9 R13 U10 R12 U12 u R7 U13 R8 R9 Q O 1 fi 1 051 __ JI E7 9 a o U11 E13a o E U14 R16 16 01 E10 E11 E12 t E14 15 L R15 0 U17 U18 U19 U20 J 0100 1 Q 11F 81 1 L TANDY CORP M...

Page 28: ...__ M_u_l_t_i_t_e_r_m_i_n_a_1_I_n_t_e_r_f_a_c_e_ TRS SO Service Manua1 Circuit Trace 1700230 Mu1titerrninal Interface Board 26 6013 Component Side lIadI8 I1ael 24...

Page 29: ...Multiterminal Interface TRS SO Service Manual Circuit Trace 1700230 Multiterminal Interface Board 26 6013 Solder Side lIadlo haell 25...

Page 30: ...00154 C17 Capacitor 100 pfd 50V Cer Disk 8301103 C18 Capacitor 1 mfd 50V Axial 8374104 C19 Capacitor 1 mfd 50V Axial 8374104 C20 Capacitor 1 mfd 50V Axial 8374104 C21 Capacitor 1 mfd SOV Axial 8374104...

Page 31: ...1 4W 5 Resistor 2 2 kohm 1 4W 5 Resistor 2 2 kohm 1 4W 5 Switch SPST DIP 8 Pos IC MC1489 Line Receiver IC MC1488 Line Driver IC MC1489 Line Receiver IC MC1488 Line Driver IC 74LS74 Dual Flip Flop IC M...

Page 32: ...S153 8040153 U23 IC 8303 Transceiver 8060303 U24 IC 74ALS240 Octal Buffer 8025240 U25 IC 74ALS244 Octal Buffer 8025244 U26 IC 7407 Hex Buffer 8000007 1 1 PCB Logic Board 8709410 2 15 Pin Staking 85290...

Page 33: ...OX enter Response There will be no response of the following error message will appear disable ttyOX is already disabled disable etc ttys not updated which is OK Type in the following command cat etc...

Page 34: ...Multiterminal Interface _ Se r v i c e M a n u a l lIadI8 lhael 30...

Page 35: ......

Page 36: ...T WORTH TEXAS 76102 CANADA BARRIE ONTARIO L4M 4W5 TANDY CORPORATION AUSTRALIA 91 KURRAJONG AVENUE MOUNT DRUITT N S W 2770 MS 2606013 1083 BELGIUM PARC INDUSTRIEL DE NANINNE 5140 NANINNE U K BILSTON RO...

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