user manual (Acrobat)
Contents
1. 2 TxD transmit data 23 DB 25S pin 9 3 TxC transmit clock 22 DB 25S pin 24 4 RTS request to send 21 DB 25S pin 4 5 DTR data terminal ready 20 DB 25S pin 20 6 RxD receive data 19 DB 25S pin 3 7 RxC receive clock 18 DB 25S pin 17 8 CTS clear to send 17 DB 25S pin 5 9 DOD data carrier detect 16 DB 25S pin 8 10 12 volts 15 DB 25S pin 6 11 notused 14 not used 12 not used 13 not used TxD TxC RTS and DTR signals leave the interface RxD RxC CTS and DCD signals enter the interface c TxC is the transmitter clock It is generated by the baud rate generator and can be sent out of the interface usually on DB 25S pin 24 if the external drive needs a clock d RxC is the receiver clock It is brought in from the external device usually on DB 25S pin 17 and is used to clock the SIO receiver If there is no external clock it is customary to connect RxC to TxC so that the receiver and transmitter run at the same speed e After configuring the jumpers the SIO controller must be programmed to communicate in the correct mode s This must be done by the serial communications program Explanation of this programming is beyond the scope of the Interface User s Manual so the user is directed to Zilog s Z80 SIO 2 Product Specification data book f Programming the TxC clock rates is simple Simply send the correct code to port EC for port A or ED for port B 6 6 CLOCK CODE CLOCK CODE 800 00H 28 8K 08H 1200 01H 32 081K2. 9 c Open the interface UNPLUG THE AC CORD Remove the two screws and carefully lift the cover d Pass the loose end of the cable through the KBD POWER hole and into the rear of the interface cabinet Feed in just enough wire so that the cable will reach the furthest corner of the power supply Force the strain relief over the cable and into the cabinet hole e Refer to Figure 6 2b and solder the cable s wires to the indicated places on the top side of the power supply s circuit board f Reassemble the cabinet Unplug and put aside the old power module that had powered the keyboard Plug the NEW power cable into the POWER socket in the back of the keyboard Push the keyboard switch ON and leave it ON because the interface now controls keyboard power g Test the entire system to verify correct wiring 6 10
3. 09H 1760 02H 38 4K OAH 2152 3 03H 57 6K OBH 2400 04H 76 8K OCH 4800 05H 115 2K ODH 9600 06H 153 6K OEH 19 200 07H 316 8K OFH Note that the SIO controller can divide these clocks by 1 16 or 64 giving all of the popular baud rates 6 7 MODIFYING POWER SUPPLY FOR 235VAC 50HZ or 117VAC 60HZ a To change the interface s voltage requirements first open the interface cover UNPLUG THE INTERFACE remove the two screws and carefully lift the cover b If you are modifying for 235VAC use refer to Figure 6 1a i Remove the two transient suppression capacitors from the ON OFF switch ii The neon lamp in the switch does not operate properly at 235VAC so disconnect the wires from the bottom lug of the ON OFF switch and fasten the wires together with a wire nut or similar device If you really want the neon bulb to light connect a 100K Ohm resistor between the wire nut and the now bare bottom lug of the switch iii Rewire the power supply transformer so that power comes in on pins 1 amp 4 Pins 2 8 3 must be connected together iv Install a 3 8 ampere fuse v Proceed to SECTION 6 8 and install the keyboard power cable which allows your keyboard to run from the interface s 235VAC supply 6 7 c If you are modifying for 117VAC use refer to Figure 6 1b i Connect the cold white wire side of the AC input power to the bottom lug of the ON OFF switch This restores the neon lamp operation ii Rewire the power supply transformer
4. Figure 1 1 There is a separate bidirectional parallel port exclusively for connecting hard disk drives Other features include a parallel port that functions like the Centronics printer port on the Radio Shack interface a screen printer port two programmable bidirectional serial ports and a crystal controlled Real Time clock OPTIONAL OPTIONAL SERIAL PORT SERIAL PORT A B 5 25 INCH 8 INCH MINI FLOPPY FLOPPY DISK DRIVE KEYBOARD ROM PORT PORT SELECT OVERRIDE SWITCH SWITCH 8 INCH HARD DISK PORT CENTRONICS PRINTER PORT UP TO 4K UP TO 32K KEYBOARD ROM OR PROM OF RAM MEMORY CONNECTOR MEMORY OPTIONAL OPTIONAL EXPANSION TRS 80 SCREEN PRINTER PORT Figure 1 1 LX80 Expansion Interface Peripheral Connections SECTION II UNPACKING THE INTERFACE 2 1 VISUAL INSPECTION Before you open the shipping container visually inspect it for evidence of shipping damage or mishandling If such damage is present a report should be filed with the carrier as soon as possible Do not remove or operate the expansion interface if any possibility of damage is evident 2 2 UNPACKING THE EXPANSION INTERFACE Carefully unpack the expansion interface and proceed as follows a Check the tag or label on the interface to verify you have received the options you ordered 16K or 32K of RAM Dual Serial Communications ports keyboard power cable 230 VAC 50Hz power supply includes cable b Check that you have a 6 inch 40 co
5. LAO Expansion Interface USER MANUAL Orives INTERNATIONAL 935 CAMINO DEL SUR GOLETA CALIFORNIA 93017 805 685 4546 eee LOBO Drives Model LX80 Expansion Interface SECTION SECTION 1 1 1 2 TABLE OF CONTENTS DESCRIPTION Introduction System Description SECTION II UNPACKING THE INTERFACE 2 1 2 2 2 3 Visual Inspection Unpacking the Expansion Interface Unpacking Disk Drives SECTION III SETTING UP THE SYSTEM SECTION IV TROUBLESHOOTING HINTS SECTION V DISKETTE CARE SECTION VI TECHNICAL DATA FIGURE 1 1 3 1 3 2 3 3 6 1 6 2 Memory Map Input Output Port Map Interface Specifications Installing Your Own 16K RAM Configuring the Alternate ROM Jumper Plug Configuring the RS 232 Jumper Plugs Modifying Power Supply for 235VAC 50HZ or 117VAC 60HZ Keyboard Power Cable Installation LIST OF ILLUSTRATIONS TITLE LX80 Expansion Interface Peripheral Connections Keyboard Flat Cable Installation Mini and 8 Floppy Disk Connections Drive 0 Configuration Switches AC Power Voltage Modifications Keyboard Power Cable Installation 4 1 5 1 6 1 6 1 6 1 6 4 6 4 6 5 6 7 6 9 PAGE 1 2 3 1 3 3 3 4 6 8 6 9 SECTION INTRODUCTION 1 1 INTRODUCTION The LOBO DRIVES LX80 Expansion Interface greatly increases the power and capabilities of your Radio Shack Level II TRS 80 microcomputer When properly installed it allows you to connect a wide variety of perip
6. SIO data A SIO data B SIO command A SIO command B PORT INPUT OUTPUT EC BAUD rate A ED BAUD rate B FF reset boot logic 6 3 INTERFACE SPECIFICATIONS a Outside dimensions Height 2 8 7 cm Width 19 0 48 cm Depth 11 8 30 cm b Power Requirements 117VAC 60HZ or 235VAC 50HZ internally jumpered Three wire grounded power cord 40 watts c Maximum number of disk drives Depends upon software hardware can run four single or double sided mini floppies plus four single or double sided 8 floppies plus any number of hard disk drives limited only by the type of hard disk drives used 6 2 d Disk storage maximum formatted depends upon software SA 400 single sided mini floppy drive single density 89K bytes double density 161K bytes SA 450 double sided mini floppy drive single density 179K bytes double density 322K bytes SA 800 single sided 8 floppy drive single density 335K bytes double density 611K bytes SA 850 double sided 8 floppy drive single density 670K bytes double density 1 222K bytes e Real time clock RTC Interrupts CPU every 25 milliseconds crystal accuracy f Two RS 232 serial channels both identical Controller Zilog s Z80 SIO 2 Serial formats ASYNC SYNC with CRC HDLC 8 SDLC Baud rates programmable 12 5 to 316 8K Cable configuration selected by jumper plugs 9 Alternate ROMs Replace keyboard ROMs 0000H 2FFFH by toggling switch Three 24 pin sockets are con
7. e as shown in Figure 3 2 3 2 RED STRIPE MINI FLOPPY INTERFACE RED STRIPE Figure 3 2 Mini and 8 Floppy Disk Connections NOTE Check the drive part numbers Only one drive can contain termination resistors and that drive must be the furthest from the interface Any unused connectors must be at the END of the cable 9 If you are installing standard 8 inch floppies refer to Figure 3 2 and connect the drives using the supplied flat cable If you are using one dual drive unit then connection is simple This unit should be labeled DS1 DS2 TERMINATORS If you are using two dual drive units then you must be sure to have a double connector cable and two specially configured dual drive units The first unit on the cable must be DS1 DS2 NO TERMINATORS while the second must be DS3 DS4 TERMINATORS 3 3 10 If installing a hard disk drive refer to its own information sheet and connect to the interface 11 You must set the drive configuration switches on the rear panel of the interface These switches tell the interface what to do when you power up or reset the system Normally you want the interface to load the operating system software from your fastest disk drive this will be DRIVE 0 Refer to Figure 3 3 for the location of the DRIVE 0 select switches If you have an 8 floppy drive or a hard disk that you want to be DRIVE 0 then you must have an 8 diskette or a hard disk that contains the disk operating system software If yo
8. figured by a jumper plug to accept one type of ROM 2708s 2716s or 2732s Alternate ROM code runs about 30 slower than in RAM h Expansion port A duplicate of the keyboard port except for no 5V power on pin 37 i Parallel printer port Talks to a Centronics like printer 6 3 6 4 INSTALLING YOUR OWN 16K RAM a It is easy for you to install your own RAM chips that you can purchase as an upgrade kit Simply UNPLUG THE INTERFACE AC CORD remove the two cover screws and carefully lift the cover b The first eight RAM chips will go into the bottom row of sockets at the right side of the circuit board The second set of eight will go into the upper row One at a time push the new chips into their sockets Be sure that the orientation notch points toward the top of the circuit board the way all the other chips go Be very careful not to bend any of the pins After inserting all of the chips double check your work then reassemble the cabinet c Now load in BASIC and do a PRINT MEM Do you have 16 384 more bytes than before 6 5 CONFIGURING THE ALTERNATE ROM JUMPER PLUG a To use the alternate ROM sockets first open the cover UNPLUG THE INTERFACE AC CORD remove the two screws and carefully lift the cover Remove the 16 pin jumper plug from the circuit board just above the ROM sockets mounted sideways Refer to the guides below and solder jumpers across the removed plug Don t melt the plastic Reinsert the plug pin 1 is oriented t
9. her particles f Use only felt tip pens to write on diskette labels g Insert the diskette into a drive carefully Never force the door closed Gently remove and reinsert the diskette 5 1 h Remove the diskette from the drive before turning the power ON or OFF i Special write protect stickers may be placed over the write protect notch in the edge of the diskette to protect your data When a sticker covers the notch of a mini diskette it becomes impossible for the computer to add or change information stored on the diskette The reverse is true for an 8 inch diskette remove the sticker to write protect the data 6 1 MEMORY MAP ADDRESS 0000H 2FFFH 3000H 33FFH 37E0H 37E3H 37E8H 37EBH 8000H BFFFH C000H FFFFH SECTION VI TECHNICAL DATA USE alternate ROMSs if selected by the switch disk boot and I O ROM read for interrupt code clears RTC interrupt read for line printer and hard disk status write for line print output first 16K RAM add on second 16K RAM add on 6 2 INPUT OUTPUT PORT MAP PORT EO E1 INPUT hard disk data floppy FIFO data FIFO counter dip switch 1791 status register 1791 track register 1791 sector register 1791 data register SIO data A SIO data B SIO status A SIO status B 6 1 OUTPUT hard disk data floppy FIFO data FIFO mode 0 read 1 write floppy select and modes 1791 command register 1791 track register 1791 sector register 1791 data register
10. heral devices printers disk drives communication modems voice synthesizers etc as well as to increase the amount of Random Access Memory RAM The increased RAM will be needed to hold longer programs and process more data quickly 1 2 SYSTEM DESCRIPTION The Model LX80 Expansion Interface is designed for the serious user who wants to improve the performance and capabilities of tte TRS 80 computer Incorporating many of the features of Radio Shack s expansion interface the Model LX80 offers many improved and new features It enhances system performance by expanding disk storage capabilities to 40 million bytes adding a second serial port and facilities for 32K of RAM A switch permits overriding the keyboard ROM for booting in diagnostics and customized operating systems One of the outstanding features of the Model LX80 Expansion Interface is its disk memory expansion capabilities The interface can support up to four 4 of any of the following disk drives in any combination providing a maximum of 40 million bytes of storage on your TRS 80 computer a 5 25 inch Mini Floppies single or double density single or double sided b 8 inch standard floppies single double density single double sided c LOBO Model 1850T Dual Fixed Floppy Disk Drives 5 or 10 Megabyte fixed up to 1 6 megabytes floppy unformatted Connections between the disk drives and the expansion interface are conveniently located on the rear and side panels See
11. is sequence a Close any files you may have opened Wait for all disk activity to stop b Remove all diskettes from all floppy drives c Turn OFF everything sequence doesn t really matter 3 5 SECTION IV TROUBLESHOOTING HINTS Due to the complex nature of the circuitry utilized in the Model LX80 Expansion Interface user troubleshooting must logically be limited to a few simple checks Should an Expansion Interface malfunction persist after the hints provided in this section are followed the user should refer the problem to the nearest LOBO DRIVES dealer or contact LOBO DRIVES directly Here are a few hints to help you get your system running a Double check all connections Be sure everything is plugged in and turned ON b Check each unit s fuse Replace defective fuses c Turn up video monitor brightness to verify its operation d Recheck cable orientations against the Figures 3 1 and 3 2 NOTE One reversed cable can disable several components A reversed cable can cause a floppy drive to erase diskettes e Be sure the NML ALT switch is in the NML normal position f Check the drive serial number Be sure you have selected the correct DRIVE 0 with the drive configuration switches see Figure 3 3 4 1 g Check that DRIVE 0 has an operating system diskette in it h Try turning the keyboard OFF for a few seconds then back to ON i Try setting DRIVE 0 to be NO DRIVE both switches off see Figure 3 3 Now
12. nductor keyboard flat cable c Check that you have a diskette containing the Disk Operating System DOS software CAUTION Be very careful when handling the diskette READ SECTION V DISKETTE CARE before handling any diskettes 2 1 2 3 UNPACKING DISK DRIVES Any disk drives you may have ordered from LOBO DRIVES will be packaged separately Carefully inspect and unpack the drives as described in paragraphs 2 1 and 2 2 Check that you have the correct long flat data cable for your type of drive Contact your local dealer or LOBO DRIVES if any item s is missing a Mini Floppies require long 34 conductor five connector cable b Dual 8 inch Floppies requires a long 50 conductor two connector cable three connectors if you have two dual drive units c Model 1850T same as Dual 8 inch Floppies plus disk controller unit power supply and special cable assemblies 2 2 SECTION III SETTING UP THE SYSTEM Find a space large enough to hold all the components of your system plus adequate work space Be sure you will have enough AC power outlets to run all the components of your system LOBO DRIVES recommends the use of a fused switched power distribution box To set up your system proceed as follows 1 For safety be sure the entire system is OFF and everything is unplugged from the AC power line 2 Referring to Figure 3 1 plug one end of the 6 inch keyboard flat cable onto the connector visible through the slot in the bott
13. om of the interface NOTE The colored wire at the edge of the flat cable should be on the right side when looking at the front of the interface 6 Y KEYBOARD FLAT CABLE INTERFACE COLORED STRIPE THIS WAY Figure 3 1 Keyboard Flat Cable Installation 3 1 3 Remove the protective plastic connector cover from the back of the keyboard Plug the free end of the interface cable onto the exposed connector Do not attempt to connect the interface to a keyboard with a DIN cable modification Do not use a Buffered or Shielded keyboard cable 4 Place the video monitor on top of the interface Plug its DIN cable into the keyboard VIDEO socket NOTE If your interface has no keyboard power cable skip step 5 and proceed to step 6 5 Identify the five conductor DIN cable coming from the rear of the interface Feed the cable under the interface and plug it into the keyboard s POWER socket NOTE You no longer need the keyboard s old power module The interface will now supply the correct keyboard power for 230 VAC installations and the keyboard will run cooler than before Proceed to step 8 6 Plug the keyboard s original power supply module into the POWER socket on the back of the keyboard 7 Place power module off to the side It car cause the picture to squirm if placed too close to the back of the video monitor 8 If you have purchased floppy drives place them to one side of the interface and plug them into the flat cabl
14. oward the upper right corner insert your ROMs into the three sockets the leftmost socket is at address 0000H and reassemble the cabinet NOTE AMP brand sockets are Mil spec devices that sometimes require puller tools to remove the ICs b Jumpering for 2308s 2708s 5v 5v 12v Connect pins 1 4 2 3 9 19 12 13 14 15 6 4 c Jumpering for 2316E 2716s 5v only Connect pins 1 5 2 4 3 19 12 13 14 16 d Jumpering for 2332s 2732s 5v only Connect pins 1 6 2 5 3 10 4 12 13 14 e Here is a description of the ROM jumper plug pins 1 decoder input B 16 5 volts 2 decoder input A 15 5 volts 3A10 14 pin 21 of ROMA 4 A11 13 pin 21 of ROMB 5 A12 12 pin 21 of ROMC 6 A13 11 not used 7 not used 10 pin 19 of ROM A B C 8 ground 9 12 volts 6 6 CONFIGURING THE RS 232 JUMPER PLUGS a To configure the RS 232 channels for your particular serial devices you must open the interface cabinet UNPLUG THE AC CORD Remove the two jumper plugs near the serial connectors Refer to the guides below and solder jumpers across the plug so that all the signals go to the correct places depending upon your particular serial device Don t melt the plastic Reinsert the plugs pin 1 is oriented toward the lower left corner and reassemble the cabinet b Here is a description of the SERIAL jumper plug pins Pins 1 and 7 of the DB 25S are permanently grounded All signals are standard RS 232 level 6 5 1 12 volts 24 not used
15. press the keyboard reset button There will be a 1 2 second pause and then MEMORY SIZE will appear on the screen you are in BASIC LEVEL Il If this message does not appear or if there is no momentary pause there is a problem with the interface or the interface keyboard cable WARNING The solid state devices contained in the Expansion Interface are sensitive to static electricity charges too small for you to feel Technicians work on them under special anti static conditions with grounding straps and other equipment not normally available to user owners Unless you are a trained computer technician refer all service to your local LOBO DRIVES dealer 4 2 SECTION V DISKETTE CARE Diskettes are precision recording media Handle them very carefully to get maximum life from each one In general follow the special handling precautions used with both tape cassettes and high fidelity records and the instructions below a Keep the diskette in its storage envelope whenever it is not in one of the drives b Keep diskettes away from magnetic fields transformers AC motors magnets etc Strong magnetic fields will destroy data on the diskettes c Handle the diskette by the jacket only Don t touch any of the exposed surfaces Don t try to wipe or clean the diskette surface you may scratch it and destroy data d Keep the diskette away from heat and direct sunlight e Avoid contamination of the diskette with cigarette ashes dust or ot
16. so that power comes in on pins 1 amp 4 Pins 1 amp 3 and pins 2 amp 4 must be connected together iii If you choose to install the transient suppression capacitors connect one 0 1uf 1000V ceramic disc from the cold white wire side of the AC input power to ground Connect a second 0 1uf capacitor from the hot black wire side of the AC input power to ground Be sure to insulate the capacitor leads iv Install a 3 4 ampere fuse v Do not remove the keyboard power cable Though not essential for keyboard operation at 117VAC it still lets your keyboard run cooler vi Reassemble the cabinet and test the interface B ON OFF SWITCH 2 ON OFF SWITCH 100KQ n 4 WATT WIRE NUT REMOVE CAPACITORS TRANSFORMER JUMPER CABLE 2 2 o 2 235 VAC 50Hz 117 VAC 60Hz Figure 6 1 AC Power Voltage Modifications DIN PLUG CABLE ASSEMBLY E nn STRAIN RELIEF DIN PLUG J HEYCO O DIN CABLE CONNECTION Figure 6 2 Keyboard Power Cable Installation 6 8 KEYBOARD POWER CABLE INSTALLATION a To install the keyboard power cable first obtain the following parts 1 DIN plug 2 Four conductor round cable stranded wire 20AWG 3 Cable strain relief HEYCO that fits the hole in the rear panel of the interface b Refer to Figure 6 2a and assemble the DIN plug end of the cable This cable should be at least 30 75cm long Keep careful record of which wire goes to which DIN plug pin 6
17. ur only copy of the operating system is on a mini diskette they you must select DRIVE 0 as a mini floppy and proceed as if it were the only drive available to you Later you may use the disk operating system commands to copy the mini disk data onto an 8 floppy or hard disk NO DRIVE 0 DRIVE 0 IS A MINI FLOPPY DRIVE 015 A STANDARD 8 FLOPPY DRIVE 0 IS A HARD DISK REAR PANEL DIP SWITCHES Figure 3 3 DRIVE 0 Configuration Switches NOTE Selection of DRIVE 1 DRIVE 2 DRIVE 3 depends upon the operating system software Refer to the appropriate section in the disk operating system manual 12 Place the interface s NML ALT switch in the NML position 13 Turn all of the units OFF Plug everything into the AC line or into the power distributor box Turn everything ON following this sequence a Turn ON video monitor b Turn ON drives Wait 20 seconds if you have a hard disk drive c Turn ON interface d Turn ON keyboard e If DRIVE 0 is a floppy drive refer to DISKETTE CARE and insert the system diskette f Press RESET button on keyboard to boot in and run the disk operating system software 14 At this point your computer system should be operational A message on the video display should indicate that the system is working and awaiting further keyboard commands Turn to the disk operating system manual and learn how to use your new system 15 To turn OFF the system follow th
Download Pdf Manuals
Related Search