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www.microtan.UKPC.net Microtan-R Tanex-Plus Manual Version 1 : 21 Sep 16 Page 1

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  • www.microtan.UKPC.net

    Microtan-RTanex-Plus

    Manual

    Version 1 : 21 Sep 16 Page 1

  • www.microtan.UKPC.net

    ContentsSpecification.........................................................................................................................................3Construction.........................................................................................................................................4

    PCB Layout......................................................................................................................................4Component List................................................................................................................................4Assembly.........................................................................................................................................5

    Installation............................................................................................................................................7Cassette Tape Interface.........................................................................................................................8

    Cable assembly................................................................................................................................8Recording Jack Plug connections................................................................................................8Playback Jack Plug connections..................................................................................................85 pin DIN Plug connections........................................................................................................8

    Installation.......................................................................................................................................9Initial Set-up (Cassette Tape Recorder)...........................................................................................9Initial Set-up (PC / Laptop)...........................................................................................................10

    Memory Management.........................................................................................................................11EPROM Paged Memory................................................................................................................12Random Access Memory...............................................................................................................14X-Bug.............................................................................................................................................15

    Translator..................................................................................................................................15Interpreter..................................................................................................................................15Cassette Tape File Handling......................................................................................................16Dumping to Tape.......................................................................................................................16Examining a File.......................................................................................................................16Fetching a File...........................................................................................................................16

    Parallel Port Interface.........................................................................................................................17Parallel Printer Interface................................................................................................................18Serial Port Interface.......................................................................................................................20

    Serial Printer Interface........................................................................................................................21Serial PC Interface..............................................................................................................................23

    Laptop/PC Set-UP..........................................................................................................................23Microtan Set-up.............................................................................................................................23

    TTL-TTL Serial Interface...................................................................................................................24Appendix A - Hyper-terminal set up...................................................................................................25

    Hyper-terminal Initial settings.......................................................................................................25MT65 Initialisation Process...........................................................................................................25

    MT65 Transmit Test Process.....................................................................................................25MT65 Receive Test Process......................................................................................................26

    Version 1 : 21 Sep 16 Page 2

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    Specification

    A single AS6C1008 (128kx8) SRAM chip providing 64K memory ($400-$EFFF addressable).

    2 x 27512 EPROMs providing 8 pages of 12K EPROM to overlay $C000-$EFFF RAM memory space.

    A single (user-selectable) IO memory location provided for selecting EPROM Memory Pageto overlay $C000-$EFFF memory space or to leave this space as RAM. Default is EPROM Memory Page 0. LED indication of selected memory bank.

    2 x 16V8 GAL chips used for SRAM addressing and EPROM port addressing/bank selection.

    2 x 6522 VIAs providing 4 parallel ports (four 2x7 IDC Header connectors) UART 6551 providing TTL level RS232 serial IO (14 pin DIL connector). Full 'true' RS232

    level serial IO also provided by MAX238 chip (2x5 IDC Header connector) - selection by jumper . (Note: 20mA Loop circuitry not retained)

    Cassette Tape interface using dual LM358 but using Oric Tape interface design. 5 way 180 deg DIN socket connector (same as on Micron Front Panel).

    Data buffering using 2 x 74LS244 chips. Accepts TANBUS DMAREQ signal and drives TANBUS DMAGNT and ABE signal lines.

    Generates TANBUS ROME, RAME and IOE signals.

    Version 1 : 21 Sep 16 Page 3

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    Construction

    PCB Layout

    Component ListC1 2.2nF C2-4 100nF (3 off) C5-14 1uF 35v (10 off) C15 220pF C16-36 100nF (21 off) C37 33uF 25v Tantulum D1-9 3mm LED (9 off) D10-12 1N4148 (3 off) EC1 DIN41612 2x32 way (a+b) R/A Plug JP1-3 2 way JUMPER (3 off) P1-4 2x7 pin IDC PCB Header (4 off) P5 5 pin 180_DIN PCB Socket P6 14 pin DIL Socket P7 2x5 pin IDC PCB Header Q1 BC547 R1-2 4k7 (2 off) R3 10k R4 1k R5 100k R6-8 1k (3 off) R9-10 22k (2 off) R11 1k R12 10k R13 4k7

    Version 1 : 21 Sep 16 Page 4

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    R14 1k R15 68 RR1 4k7 RR2 470 SW1 DIPS_08 SW2 DIPS_02 TH1-2 PTC FUSE (Polyswitch) 1.1A 30v (2 off) U1 74LS04 U2 74LS138 U3 GAL16V8 U4 74LS682N U5 74LS32 U6 74LS138 U7 GAL16V8 U8 74LS138 U9 74LS175 U10 74LS21 U11 74LS139 U12 74LS30 U13 TMS27C512 U14 TMS27C512 (2nd EPROM option) U15 AS6C1008 U16 74LS00 U17 74LS74 U18 LM358 U19 R6522 U20 R6522 (2nd VIA option) U21 R6551 (Serial option) U22 74LS244 U23 74LS244 U24 2716 U25 74LS157 (Serial option) U26 74HCT4053 (Serial option) U27-28 MAX232 (Serial option) X1 1.8432Mhz Crystal (Serial option)

    IC Sockets 8 way 1 off 14 way 7 (inc P6 above) 16 way 9 off 20 way 5 off 24 way 1 off 28 way 3 off 32 way 1 off 40 way 2 off

    Assembly

    Use the PCB Layout and Components List above to identify the location of the components on the PCB. With the exception of the resistors, ceramic capacitors, crystal, jumpers and poly-switches, all other components need to be orientated correctly. The longer leads on the electrolytic capacitors and LEDs are the positive leads. Square pads on the PCB denote the location of the components' Pin 1 or positive lead as appropriate.Note that C36 lies within the outline of IC socket U21 and so its leads need to be long enough

    Version 1 : 21 Sep 16 Page 5

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    above the PCB to allow the capacitor to be bent over flat against the PCB surface.Some areas of the PCB are densely populated. If using electrolytic capacitors around the sockets for ICs U27 and U28, position all these items in place before soldering.After all components have been soldered, check underside carefully for bridged tracks and IC pins / component leads not soldered.

    Version 1 : 21 Sep 16 Page 6

  • www.microtan.UKPC.net

    Installation1. Remove MT65-R CPU from system rack

    2. Open Links RAM, ROM and I/O on the MT65-R CPU board

    3. Re-insert MT55-R CPU into the system rack in the CPU slot