TIM-2

The TIM-1 IC is a 6530, and since the 6532 is nearly identical with regards to I/O and timer facilities it is possible to construct a TIM system with the same software.

And that is what Peter Renaud has done. He took a 6532, a 6502, an EPROM (as replacement for the mask ROM in the 6530-004) and some RAM, some glue logic to build a system. See the cicuit diagram and source below (reproduced here with his permission).




Schematic in PDF format

TIM-2 assembler source
Adapted for other I/O RAM and ROM addresses, functionally identical to the TIM-1 source.
Changes are (besides some assembler related)
– I/O base TIM-1 = $6E00 TIM-2 = $6800
– ROM start TIM-1 = $7000 TIM-2 $F000
– 64 Byte monitor reserve area TIM-1 $FFC0 TIM-2 = $6000
– TIM-2 no INT Vectors area
– RS232 bit inverted
– 7 bit ASCII forced


An older version of the TIM-2 on the test bench of Peter.

post

Elektor Junior computer large update

After finishing the large update a month ago of KIM-1/SYM-1/AIM 65 I turned my attention to the Elektuur/Elektor archive, mainly the 6502 period of 1978 to 1985 where the SBC Junior Computer and EC65/Octopus systems were introduced.

New and enhanced in higher quality information about these systems:
– published in multiple languages and more content of articles and books scanned, not only dutch bnut also English, German, French, some Spanish and Italian.
– better hardware descriptions and photos of PCBs etc
– more complete software library, sources of systems ROMS etc.
– gallery of Juniors, EC65 and other cards and cases

Start here for the Elektor/Elektuur/Junior/EC65/Octopus pages.

Junior retronics articles

Elektor did write about the Junior and related designs in recent years, retro electronics! This site (at the present and previous wwww locations) was mentioned also.

Oh, and this is retro but not a Junior computer!

Elektor Literature

6502, Junior and EC65(K)/Octopus publications by Elektuur and Elektor 1978 -1985 and the magaizines KIM KENNER and COMPUSER

Books and Paperware Junior Computer, Dutch, English, German, French, Italian
Articles from the magazine Elektuur and Elektor 1978 -1985
– Nederlands
– Engels
– Deutsch
– Francais
The dutch KIM/6502 Club published many articles on the 6502 and the Junior: KIM 6502 Kenner archief

KIM KENNER 12

4 “De Junior” door Anton Muller

KIM KENNER 13 – 18 oktober 1980

4 Hex teller en flip flop voor de Junior, J. Hummeling
6 Ervaringen met de Junior computer, W.L. van Pelt

KIM KENNER 14 – 20 december 1980

4 JUNIOR, H.J.C. Otten
8 One armed Bandit voor de Junior, F.J. Butterfield
12 Ervaringen met de Junior, J. van Sprang en W.L. van Pelt
14 Junior leesroutine voor Kansas City cassette interface, Sebo Woldringh
16 Junior schrijfroutine voor Kansas City cassette interface, Sebo

De 6502 KENNER nr 15 maart 1980

13 Ervaringen met de JUNIOR J. van Sprang en W.L. van Pelt
15 Letters en cijfers op JUNIOR display J. Hummeling

De 6502 KENNER nr 16 mei 1981

24 Ervaringen met de Junior, W. Van Pelt en J. van Sprang
26 Automatische register uitlezing voor de Junior
39 Browse voor de Junior

De 6502 KENNER 17 – augustus 1981

12 Ervaringen met de Junior, Willem van Pelt en John van Sprang

De 6502 KENNER 19 – december 1981

Schrijf- en lees routine voor de Junior, Dick Blok
15 Rapportcijfer, Rein Duyts
22 Display op oscilloscope, C. Totte
28 Aanpassingen aan de Macro Assembler van C.W. Moser, van Nieuwenhove Koen
34 Patches op Basic, Hans Otten
35 Lichtshow voor de Junior en de KIM, K. Kikke
38 4 kolom printer, A.S. Hankel
40 Printer routine voor H14, Paul de Beer en Hans Otten
43 Break voor Junior en KIM, Frans Mepschen

De 6502 KENNER 20 – februari 1982 LUSTRUM nummer

79 SYM Microsoft Basic aangepast voor de Junior, door Jaron Orenztajn
81 Aanvullingen voor de Elektuur EPROM programmer, door John van Sprang
85 Aanpassingen Junior print voor 2716, door J. Vollering
86 Bugs
87 Patches Micro Ade deel 11 voor de Junior, door A. Hankel
91 Voedingsschema voor +5V, +12V en -12V. door Frans Smeehuizen
92 Memory test aangepast voor de Junior, door Bert van Tiel

De 6502 KENNER 21- Mei 1982

36 Junior’s aan de PET, door Ruud Uphoff

De 6502 KENNER 22 – Augustus 1982

12 Patches op KIM-1 Basic t.b.v. de Junior, door Van Nieuwenhove Koen

De 6502 KENNER 23 – Oktober 1982

11 Patches op KIM-1 Basic t.b.v Junior (deel 2), door Van Nieuwenhove Koen
25 R.T.T.Y. met Junior, Telexberichten via korte golf op uw scherm, door A.S. Hankel
32 Easy Editing Supporter v. Junior, door R.C. Vissers
40 Simpele geheugenuitbreiding, door H. Burgers
43 Single Step Debug Programma, door M. A. v.d. Laan
46 Tiny Basic voor Junior + cassette routine, door Filip van Kenhove

De 6502 KENNER 24 – December 1982

14 Patches op KIM-1 Basic t.b.v Junior (deel 3), door Van Nieuwenhove Koen
4 Cassette bibliotheek, Junior cassette 2

De 6502 KENNER 25 – Februari 1983

6 Patches op KIM-1 Basic t.b.v Junior (deel 4, slot), en bugs in deel 1,2 en 3, door Van Nieuwenhove Koen
24 Junior en dubbel adressering VIA 6522, door Koen van Nieuwenhove
35 AIM-65 Basic voor de Junior, door E.J.M. Visschedijk

De 6502 KENNER 26 – mei 1983

4 ReNr en Append voor de SYM-Basic voor Junior
6 Maak van Junior een Senior: Disk drive Systeem van Proton op Junior, door P. Franssen
16 Printen op OKI Microline 80 Printer, een nieuwe printer routine voor Junior

De 6502 KENNER 27 – Augustus 1983

3 Proton’s JUNIOR DOS
3 Spiraal (KIM) nu voor Junior
19 Koppeling van Junior aan 8″ Floppy, met FD1771 controler 8″ single en 5″ double density, door Koen van Nieuwenhove
41 UART schakeling voor Junior, door A.A. Zwart

De KIM KENNER 28 – Oktober 1983

6 Grafisch display voor Junior, door H. Christen

De 6502 KENNER 29 – December 1983

21 Read Junior’s SYM-Basic cassettes with Microsoft KB9 Basic
22 Toevoegen niruwe commando’s aan de SYM-1 Basic voor KIM-1 en Junior, Frans Smeehuyzen
25 Vraag en aanbod
26 Automatisch regels verwijderen, Frans Smeehuyzen
28 Boekennieuws
28 Clear screen voor JUNIOR’s SYM-1 Basic, Will Cuypers
29 Tekstverwerker, naar een idee van M.A. van der Laan
31 Hexadecimaal omzetter, Dick Blok
33 Universele geheugenkaart voor Junior
33 KB9-Basic op Acorn SYSTEM-1
39 Junior’s Hex monitor on Acorn-System, Alfons van de Meutter

De 6502 KENNER 30 – Februari 1984

8 Usurpator, schaakprogramma voor Junior, Fridus Jonkman
9 PACHA, patch on PM monitor, Fernando Lopez
11 Bouw eens een Miljonair: 2 miljoen bytes voor uw Junior, Jam H. Vernimmen
17 Program cassette 1: Junior/Apple formaat cassette routines deel 1, A Brouwer
34 LED’s op Junior, Hans Buurman
37 Uitbreidingen op SYM-1 Basic voor KIM en Junior: automatische regelnummering, Frans Smeehuyzen
39 Missing data in Junior Book 4
47 Load your Junior Sym-Basic Tapes into KB-9

De 6502 KENNER 32 – Juni 1984

21 KIM-1 en Junior KB-9 Basic Tokenized Microsoft Basic Keywords and addresses, Willem L. van Pelt
28 Aanpassen regelbreeddte via het toetsenbord, Frans SMeehuyzen
47 Extended AIM Basic Junior patch on Basic program compressor
4 Tips & Trics, Wout van Dinther en Gerard van Roekel
29 Junior Command Characters, Coen Kleipool
34 Basicode-2 voor de Junior met SYM-Basic, Fridus Jonkman
36 Hexdump voor de Senior Monitor voo Junior met PROTON’s monitor, Rob Banen
44 UART schakeling voor Junior, A.A. Zwart
44 Textfiles with Junior, Camiel de Ly

De 6502 KENNER 33 – Augustus 1984

3 Epson FX80 printer routine for Junior with OS65D
8 Junior disassembler voor hexdisplay, Fridus Jonkman
17 Low cost Elekterminal Expansion, R. Baarslag
24 Spiraal, grafisch op Junior met VDU kaart, Japp van Toledo
33 Tracer en single step, voortzetting uitbreidingen SYM Basic op Junior, Frans Smeehuyzen

De 6502 KENNER 34 – Oktober 1984

36 Save en load routines PROTON DOS SYM-1 Basic op Junior, Frans Smeehuyzen
33 HEX ascii dump, FORTH Gert Klein
39 Wallbreaker for Junior with OHIO-DOS, Willem Kuitens
42 Maanlander, Maarten van Hintum
44 Junior 8K of Junior 64K, Hans Mooi

De 6502 KENNER 35 – December 1984

5 Junior met VDU kaart Greedy spelprogramma deel 1, Phons Bloemen
48 Junior met D.O.S, Koen van Nieuwenhove Speed

De 6502 KENNER 36 – Februari 1985

5 Junior met VDU kaart Het grafisch display, J.J.A. en J.A.J. Janssen
21 FORTH op Junior deel 1, Gert van Opbroek
24 OHIO DOS V3.3 Aanpassen I/O routines, Wout van Dinther
24 How to change the Memory Map of your FORTH system on Junior

De 6502 KENNER 37 – April 1985

17 Junior met DOSV2.0A Bug in Disc patches on ASSM/Ted, Hans buurman
45 FORTH op Junior computer, Gert van Opbroek

De 6502 KENNER 38 – Juni 1985

11 Dubbele dobbelsteen Junior met PM Maarten Lamey
22 ID en KB-9 Microsoft Programs, Camiel de Ly
23 VIA ACIA print, M.A. van der Laan
32 Patches op PM Junior
40 Sorting subroutine Junior Fernando Lopez

De 6502 KENNER 39 – Augustus 1985

10 DOS65 JUNIOR, another DOS for the Junior, Coen Kleipool
12 Boekbespreking
13 Time of day, de 6526 nader bekeken, Ruud H. Uphoff
18 Vraag en aanbod
19 Junior met OS65D V3.3 Uitbreidingen, Gert Klein
33 Junior Tape I/O, A.W. den Hertog
35 Ervaringen met de PC-2 computer van Proton Electronics
35 HCC Computerdagen 16/17 nov 1985 reductiebon
36 Tokenized Microsoft Basic Keywords and addresses CBM40XX, CBM 80XX, Nico de Vries
46 Automatische dataregel teller
47 FORTH op Junior deel 3, Gert van Opbroek

De 6502 KENNER 40 -Oktober 1985

39 Junior in Apple, Frans Verberkt
42 C64JUN, Junior leest C64 tapes, R.A.F. Bens

De 6502 KENNER 41 – December 1985

6 Basic teksteditor OHIO DOS Junior, Maarten van Hitum
15 Screen editor V3.0 SCRED 3.0 Junior met VDU kaart voor Basic of Comal, B. de Bruine

De 6502 KENNER 42 – Februari 1986

9 Real-time clock voor de Junior, Clock IC MC146818, M.J. Stiphorst
15 Octopus 65, fout in publicatie FCU kaart Elektuur Special
24 Octopus 65 Let it be, Will Cuypers
26 GRAF V2.4 Routines grafische kaart, J.J. A. JAnssen
38 Basic programma Competitiestanden Handbal Elektuur Junior deel 1, Gerard Keet

De 6502 KENNER 43 – April 1986

16 65(C)02 Vervanging 6502 in Junior, Jan Vernimmen
17 Elektor’s octopus diskettes available
18 Basic competitie standen deel 2, Gerard Keet
23 Een wait ingang voor de Junior, Roger Langeveld
29 Octopus Diskette copier version 2.2, Wolfgang Tietsch
44 Bankswitching for the Junior, Fernando Lopez

De 6502 KENNER 44 – Juni 1986

1 Inhoudsopgave
2 Alternatieve Break routine tbv CPU kaart, Frans Smeehuyzem
4 Elektor’s OCTOPUS/EC65 computer: A data buffer as afterthought, R.T. Overakker
6 Problem with EC65 poweron reset, Siegfried Losensky
7 Elektor’s Octopus/EC65 Modified diskette copier version 2.2 part 2
18 Junior interface card en gewijzigde VDU card, Pieter de Visser
21 Junior POSVAL Chessmonitor for Elektor with hexdisplay, Frans Raaijmakers
21 EC65 Patch realtime clock
29 Printer initialisation for EC65, Leif Rasmussen
29 EC65 SAMSON tips, Leif Rasmussen
31 Basic competitiestanden part 3, printroutine voor teletype 110 baud
38 Junior with Proton’s Senior monitor modified format lister, Rob Banen
45 6845 geprogrammeerd
48 Delete character routines tbv de Elektor VDU card

De 6502 KENNER 45 – Augustus 1986

3 Elektors EC65 Starcatcher Basic game
42 Junior with VDU OHIO DOS NUMBERS routines to handle input of numbers from the keyboard
12 Realtime clock 146818 IC routines, Frenando Lopez
21 Elektor VDU card modification, J.C. Rix
22 New Centronic routine for Junior/Octopus 65, Coen Boltjes
25 Junior POSVAL Chessmonitor for Elektor with hexdisplay, Frans Raaijmakers
43 Basic competitie standen deel 4, Gerard Keet
46 Use of cursor control keys ED, Rene Hettfleisch
46 Octopus/EC65 disks

De 6502 KENNER nr 46 – october 1986

5 Block graphics on EC65: screendump, Leif Rasmussen
6 An interrupt decoder for the 6809, Andrew Gregory
8 8K RAM voor de Atom, Karel Odon
8 Patch on Dr Tietsch’s copier program, Marc Lacheart
9 A macro loader and Saver for ED DOS65, Bram de Bruine
11 Bitpatroon voorde C64, Gerard van Roekel
11 TIP: 0 in data regels plaatsen, Gerard van Roekel
12 Basicprogrammas’ combineren 2 en 3 letterwoorden, Gert Kwetters, Bart van Pelt
13 Junior bekent kleur, Phons Bloemen
17 Look at real contents Atari, Henk Speksnijder
17 Modification VDU card Octopus65, Albert v.d. Beukel18 Junior POSVAL schaakmonitor part3 end, Frans Raaijmakers
18 Junior Changing the 6502 by a 65C02. Jan Vernimmen
19 Troubles with Micro Ade and Elektor’s Octopus, Marc Lacheart
19 Solution of Micro Ade problem of contineous erros, Ronald Hermans
20 Junior malfunction Display, Ronald Hermens
21 Directory Disk1 ‘System Loys diskette’, Fernando Lopez
22 Bell routine for Octopus/EC65 with Basicode interface card, Coen Boltjes
22 Junior POSVAL wijizigingen in gepubliceerde listing, Frans Raaijmakers
23 Error messages Junior, adapted for Junior, Ronald Hermens
25 PL3/4 straps poblem CPU card, Frans Smeehuijzen
30 Patch in the Octopus/EC65 standard monitor, Marc Lacheart
30 Patches on Disk 5A (Original OSI V3.3) Marc Lacheart
31 Problemen met de Octopus65 met RS232 printer, J.A. van Eken

De 6502 KENNER nr 47 – December 1987

4 Hardware adjustment Junior/Octopus with VDU card for use as a videotext terminel Prestel standard, Coen Boltjes
6 How to adjust the character generator for Videotex, Coen Boltjes
8 Junior Break key with serial keyboard, Gerard van Woerkom
12 Directory Disk 5a Ohio DOS
12 Junior dubbel adressering, Frans Bens
18 Tips and tricks for the EC65K/Junior, Coen Boltjes
19 MON65 op Junior, Erik v.d. Broek
20 The Junior Computer revisited, Fernando Lopes
28 Bell for EC65, Rasmussen and Lindstroem
32 Extension of OS-65D V3.3 with DEL command
38 Screen flickering, Andrew Gregory
38 Slave: bootstrap loader Junior, Ronald Hermens
39 TELEX programma MCB 1984, Marcel Breukink
44 Columns print for printing in two columns, Octopus, Leif Rasmussen
45 Hardcopy routine for Octopus, Coen Boltjes

De 6502 KENNER nr 48 – February 1987

5 Videotex program for the Junior Octopus, Coen Boltjes
26 Ascii dump with OS65D extended monitor, Gerrit van Woerkom
28 Working with Micro Ade and bankswitching on the Junior Computer, Fernando Lopes

De 6502 KENNER nr 49 – April 1987

7 EC65/Octopus Screendump for Kolorator, Leif rasmussen
11 Plotpoints Atari 520ST, Jan Vernimmen
16 Expansion for Ohio DOS Extensions, Coen Boltjes
25 EC65/Octopus How to get more memory space, Peter Linstrom
29 DOS65 ACIA 65C51 and modems. Bram de Bruine
31 Centronics input for DOS65 or Junior computer, Ernst Elderenbosch
32 How to modify the Elektor 64K memory card for use with DOS65, Andrew Gregory
33 Hoe wordt de video controller 6845 geprogrammeerd
39 Forth on the Junior, Frans Bakx
43 Maanlander Junior, Fridus Jonkman
46 Printer routine for Junior, Alfons v.d. Meutter

De 6502 KENNER – nr 50, Juni 1987

4 Fast alternative for the slow Junior cassette interface and software, Hans Christen
8 Solved problems Octopus vdu card monitor EPROM
19 Relocator for DOS Junior and Octopus 65, Coen Boltjes
21 RAM Test program for the Octopus 65, Marc Lacheart
36 Paperware service EPROM programmer for Junior, Andrew Gregory

De 6502 KENNER nr 51 – Augustus 1987

9 EC65/Octopus cassette motor control and Bell hardware, Marc Lacheart
17 EC65/Octopus Wordprocessor V3.0 available, Leif Rasmussen
17 EC65/OctopusPatch on Dr. Tietsch Copier program, P. Lindstrom, Leif Rasmussen
17 Printer problems with the Octopus, Maarten den Hertog
21 Loys extra, how to bind the systemdisk utilities, Leif Rasmussen
28 Junior tape routines on DOS65, Ernst Elderenbosch
26 Octofate: Fate for the Octopus, Coen Boltjes
26 Octopus inputverwerking, A.P. Oerlemans

De 6502 KENNER nr 52 – October 1987

25 EC65 EPROM disk loader
27 EC65 EPROM disk directory
32 EC65 NUMINT basic
34 EC65 Language study help
37 Junior MAZE

De 6502 KENNER 53 – december 1987

30 EC65 Modified version of Elektor’s listing stopper

De 6502 KENNER 57 – Augustus 1988

34 DOS Errors in words EC65

De uPKenner 61 – April 1989

28 EC65K EPROMs programmeren

COMPUSER Volume 1 Nr 2 March 1988

16 Screen noise on Junior with VDU: synchronize CPU and VDU
17 A description of the DOS65 Disc format
24 Tape backup and restore utility OCTOPUS/EC65, Marc Lachaert
35 OHIO DOS V3.X special for Junior, Dirk Picke

COMPUSER Volume 1 Nr 5 March 1988
1 Fractals in assembler EC65 Leif Rasmussen

COMPUSER Volume 2 Nr 1 January 1989
14 Transfer OCTOPUS into a development system, Peter F. de Pauw
34 Read time and date EC65, Peter lindstrom
38 Junior DOS65 Erik vd Broek

Junior software

Monitor ROMs, binaries and sources

The Monitor was published as a hex dump as second article in the Junior publication, See it here.
Note that this 1K ROM was assembled for address $1C00, since the Junior maps that location also to $FC00, where a iK 6502 boot ROM has to be. Of course this means trouble when the memory decoding is enhanced and Elektor spent much text and hardware to solve this. The best solution is not to use the original ROM but use a binary assembled for upper memory.
Here you see where to change the addresses.

A collection of dumps of various ROMs from Juniors, expansion cards, EC65/Octopus. Not tested but may be useful.
PM. TM Monitor etc, 506, Mini EPROM 511(n)
VDU, Character, Micro Ade, SYM AIM BASIC EPROMer 6502 tracer, 244, Mini EPROM 51
EC 65 Octopus ROMs, dumped from CPU cards

The system software of the Junior is made up of several ROMS. The Monitor ROM is the base system in 1K in a 2708 EPROM on the main board.
The Interface board offered space for 2716 type of EPROMS and audio tape management. ROMs like the PM, TM and PME appeared. See the Junior Book 4 for more information.

If you want a reliable ROM for a Junior, build it from source. Available sources are:
PM TM PME sources
PM source
Monitor ROM source at $FC00
Monitor, for $1C00! by Bram Prosman
PM PM PME sources
Monitor sources in CW Moser format, and recombined for $FC00

You can assemble these sources with the assembler included in the archive or with one of these fine assemblers:
TASM Telemark assembler, runs on Windows 10.
A65 assembler, run in DOSBOX or VDOS.

Microsoft KB-9 Basic V1.1

How to adapt KB-9 BASIC to the Junior

KB-9 stands for Microsoft BASIC V1.1 for the KIM-1  with 9 digits precision. .
Scanned manual
The original KIM-1 KB9 Microsoft BASIC V1.1, binary and papertape

See the KIM-1 Software page for more information on KB-9 BASIC.

Tiny Basic

Tom Pitman’s Tiny basic. Small enough to fit in th 1K KIM-1, yet a real Basic interpreter

Tiny Basic binaries, low memory version and version with start address 2000
Tiny Basic manual as pdf
KIM Kenner 23 Tiny Basic, Filip van Kenhove, adapt to Elektor Junior

See the KIM-1 Software page for more information on Tiny Basic.

COMAL

COMAL is an interpreted structured language. I have only as original the KIM User Club Elektor Junior version, and as with most of the 6502 SBC programs, not that difficult to adapt to a KIM-1, as shown in the last pages of the manual (in/out/break character, load/save tape, memory layout).
KGN COMAL binary
Manual KGN COMAL (dutch)

See the KIM-1 Software page for more information on Comal.

Micro Ade

Micro-ADE was the working horse for many KIM-1 users, the small and powerful assembler/editor written by Peter Jennings.
Manual and program are placed here with permission by Peter Jennings to the KIM Club (thank you Peter for this and for a great program!)

Micro Ade program binaries, KIM-1 original, Elektor Junior, extended versions
See the KIM-1 Software page for more information on Micro Ade.

Microchess

Microchess for the KIM-1. Runs on a standard KIM-1, in the available RAM of 1.1K. Control via LED displays and hex keypad, with patching also via the TTY interface.

Binary, original dump of cassette files
Original manual (from the reseller The Computerist
Original manual by Peter Jennings
Micro on the Junior (from http://www.sjlabs.nl)
See the KIM-1 Software page for more information on Microchess.

Various sources

CW sources
Junior hypertape test
Junior hypertape
Junior sym basic basicode source read write part 1
Junior sym basic basicode source read write part 2
RTTY sources
RTTY sources
Tutor Morse code KIM Kenner
Elektuur issue 222 clock source

Junior tapes

In a package with Elektor hardware Octopus cards I once bought, I found a little book and a floppy disk in DOS65 format with Junior tape dumps. Already in binary format, made with what I think is an 68000/Atari/Amiga program. Source is also included. Download here the archive

Included are sources and programs like
– Junior PM and TM
– memory test
– Micro Ade, KIM-1 and Junior version, also in source format and extended format
– Clock source program
– CW Moser assembler/editor, also in source
– Forth, Comal
– SYM Basic adapted to Junior

See the included juniortapes.txt for a complete listing of what is included on tape. Note that most files have been ‘unpacked’ and renamed and are available here and on the KIM-1 Software page , either as binary or as source. See the PC Utilities page how to extract the assembler source files.

Junior DOS

The floppy disk system for the Junior was based upon OS-65 V3D from Ohio Scientific, the interface is a clone and, since the software was for sale, a separate object.

Junior deutsch


Junior Computer

Junior Monitor

Elektro uC-systeme

RS-232 Interface

Junior-Computer stellt sich selbst vor

Junior Speichererweiterung

Normalzeit-Empfänger für DCF-77

Junior Computer als “Atom-Uhr”

DCF-Computer-Schaltuhr

DCF-Computer-Schaltuhr ohne DCF

Junior Text

Power-On-Reset für den Junior-Computer

Junior-Journal

Junior-Computer Hardware vollendet

Junior-Computer: Interface-Karte

Junior-Computer: Systemsoftware wächst

IPROM

EPROM-Programmiergerät

Mini-EPROM-Karte

Disasembler …

uP als Minizähler

PSS Privater Software Service

Zeitansage …

Jnior-Computer als Telefon-Gebühren-Rechner

Junior-Vector-Gewinnung

Single Cycle für Junior Computer

Floppy-Disk für Junior part 1

Floppy-Disk für Junior part 2

Universelle Speicherkarte

Junior-Programmtester

ASCII-Tastatur

Parallel-Seriell-Wandler

RTTY-Terminal

Vector-Ansteuerung für den Junior

Busy-indicator für den Junior

Zeichen auf dem Bildscherm

VDU-Karte

Bildrausch-EX

6502-CPU-Karte

Buserweiterung

Omnibus

Indirekte dateien mit dem Junior

Den Junior macht musik

EPROMer für Z80

Adressdekodiering

EPROMer ohne Schnittstelle

Signal & zeit

6502-Tracer

Vectorfalle für 6502

EPROM-Umschaltung

SWAP

Echtzeituhr für Mikroprozessoren

Tracer für 6502

CPU-Taktgenerator

CPU-Bremse

Morsetraining mit dem Junior Computer
post

Junior EC65 hardware

The Junior Computer hardware and software is described in detail in the books and articles, see there for details.

Base Junior computer, quite a small system!

Circuit diagram

PCB front

PCB back

PCB layout front

PCB layout back

LED display PCB and layout

Address sticker

Photo of (stripped clean) PCB front

Photo of (stripped clean) PCB back

Interface card, adds more memory, cassette interface, TTY interface

Circuit diagram part 1, ROM, RAM, VIA

Circuit diagram part 2, TTY interface, audio cassette interface

Interface card  PCB front (note not on scale!)

Interface card PCB back (note not on scale!)

Interface card layout

Backplane PCB, part of it could be used to connect Junior PCB to Interface card.

Backplane layout

Memory layout

Elektor bus

Musicprint kit and cassette interface

The Junior was sold as a kit by the firm Musicprint, read here the extra instructions in the kit.

It took Elektuur some time to add a cassette interface tot the Junior design, a year until the Interface PCB appeared. Many users therefore bought the socalled musicprint cassette interface. See here the description and circuit design.

A 2732 EPROM can be used instead of the 2708 EPROM when you perform the following:
– cut the traces +12 and -5V
– K6 to the VIA,
– K7 to the EPROM.but leave K7 to the 7401 intact for the STEP function.
– /CS from VIA to K3 to move the VIA to page 0E (jumps in the EPROM are adapted for that)
– /OE from the 2732 to ground
– A10 and A11 of the 2732 to the addressbus
– /CS from the 2732 via an inverter to A12 , note that there are two unused ports in the 7402 with grounded inputs,: cut those! and add a pull up resistor

Junior Nederlands

Nederlandstalige artikelen uit Elektuur 1980 en later.

1980
First article Junior Computer March 1980 in color
PDF file of the first two (dutch) articles 3-26 and 4-72 with the complete hardware design
All other Elektuur Junior articles 1980
March 1980 Junior-computer The introduction article
4-72 Junior-computer hexadecimal monitor dump
5-66 KIM Gebruikers Club promotion! nogmaals: junior-computer nog wat aanvullende gegevens
6-56 elektuur uP systemen
8-26 RS 232 interface
9-48 RAM/EPROM kaart 8K RAM + 4,8,16K EPROM
10-42 meer junior-geheugen, memory decode for RAM/EPROM card
11-71 Junior groeit!
1981
All other Elektuur Junior articles 1981
2-54 junior-tekst, show text on led displays
3-54 junior-journaal, practical tips
4-41 Junior-hardware kompleet (PDF file)
4-52 junior-software aangevuld
5-56 junior-uitbreidingen bouwrijp (PDF file)
6-53 Junior Computer als Voltmeter (G.Sullivan)
10-53 EPROM-Programmer
12-46 pseudo-ROM
1982
1-58 EPROMmer (P.R. Boldt)
All Elektuur Junior articles 1982
3-47 Junior spreekt Basic, adapt KIM KB-9 Basic to Junior
4-46 mini-EPROM-kaart
4-50 dynamische RAM-kaart
5-39 Software-uitpluizer (disassembler)
5-62 PSS Prive Software Service (EPROMmer)
5-67 Mini-teller met microprocesssor
7-59 Junior-vektoren ophalen (R. Mattysek)
7-46 single-cycle voor junior-computer (E.Kytzia)
9-74 konnektie tussen basis- en interface print
10-59 Van 6502 naar 6809
11-58 Floppy-disk interface voor junior en andere 6502-computers deel 1
12-26 floppy-disk interface deel 2 (Ohio Scientific DOS)
1983
1-66 verkeerslichtensturing (D. Herzberg)
All Elektuur Junior articles 1983
3-28 Universele geheugenkaart
5-60 morse-dekoder
5-37 junior-programmatester
5-38 ASCII keyboard
5-48 parallel-serie-omzetter voor ASCII keyboard
6-48 RTTY-dekoder
7-73 busy-indicator voor junior
7-73 Centronics interface 6522
7-79 vektor-aansturing voor junior
9-58 VDU kaart
9-66 de muzikale junior
9-74 64K op de dynamische RAM-kaart
10-57 basicode-2 voor de junior
10-72 EPROMmer zonder interfacekaart
11-68 universele terminal
12-42
Omnibus busprint
12-44 indirekte files op de junior
12-70 Bus uitbreiding de Elektuur bus
1984
All Elektuur Junior articles 1984
1-68 adresdekodering
2-75 Basicode-2 voor Junior met VDU-kaart
2-66 6502-tracer
3-40 Tapemonitor uitbreiding
4-53 ID-list
4-71 motorschakeling voor floppy drives
6-36 merge voor BASIC files
7-50 RES IRQ NMI indikator
7-68 2716 voor 2708
8-12 start-omleiding voor 6502
8-15 beeldruiskiller
9-72 DOS-uitbreidingen
11-33 de 6845 geprogrammeerd
1985
RAM als EPROM
swap routine voor 6502
6502 tracer
1978 – 1983 Elekterminal All articles in one
PDF file of issues 181 to 231