Tynemouth MINI PET 40/80 User manual

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TYNEMOUTH MINI PET 40/80 KIT USER MANUAL
PARTS LIST
CAPACITORS –ALL RATED 16V OR HIGHER
2 x 22pF axial (usually marked 220 or 22J)
30 x 100nF axial (usually marked 100n or 104)
4 x 1µF axial (usually marked 1u0 or 105)
1 x 100µF (axial electrolytic rated 25V or higher)
RESISTORS –ALL ¼W 5% OR BETTER (4 BAND RESISTOR COLOUR CODES SHOWN)
2 x 75Ω
2 x 470Ω
1 x 1KΩ
3 x 2.2KΩ
2 x 4.7KΩ
6 x 10KΩ
5 x 100KΩ
3 x 390KΩ
2 x 4K7 7 bussed resistor array, 8 pin (usually marked 8X-1-472) - pin 1 marked by dots on package and PCB
5 x 10K 8 bussed resistor array, 9 pin (usually marked 9X-1-103) - pin 1 marked by dots on package and PCB
SEMICONDUCTORS - NEW TEXAS INSTRUMENTS ICS RECOMMENDED.
3 x 1N4148 diodes (no part number marked on the PCB)
1 x 1N4001N diode (marked on the PCB as 1N4001)
4 x 5mm LED (optional)
1 x BC548B
3 x 74LS07
1 x 74HC00
1 x 74HC86
3 x 74HC138
1 x 74LS145
1 x 74HC166
1 x 74HC257
1 x 74HC393
1 x CD4013
1 x CD40106
1 x WDC W65C02S (do not fit anything else into this position other than a W65C02S, it will not work, the pinout is different)
2 x WDC W65C21N (not W65C21S)
1 x WDC W65C22N (not W65C22S)
1 x 62256 32K SRAM 600mil wide (e.g. Alliance AS6C62256 or Cyprus CY62256)
1 x IDT7132 (2K Dual Port RAM)
1 x 27C256 EPROM (font ROM)
1 x 27C020 EPROM (OS/BASIC ROM)
1 x ATmega164P (pre-programmed CRT controller)
4 x MIC2951-03YN (voltage regulator)
1 x 16 MHz Crystal (HC-49/U package)

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CONNECTORS / SWITCHES / SOUNDER
4 x standard tactile switch 12x12mm + keycaps (e.g. Omron B3F-4055)
73 x light touch tactile switch 12x12mm + keycaps (e.g. Omron B3F-4050)
1 x Piezo AC transducer (not a buzzer or any sounder that has internal circuitry)
1 x 48 pin, 5 x 40 pin, 1 x 32 pin, 2 x 28, 6 x 16 pin, 8 x 14 pin, 4 x 8 pin IC sockets (turned pin recommended)
1 x 10 way DIP switch
1 x Phono jack (e.g. CUI RCJ-011 –Digi-Key CP-1400-ND)
1 x 2.1 mm DC Jack
OPTIONAL CONNECTORS
1 x 7 way 0.1" connector for video (pin 2 removed) (Optional if using monitor connection)
2 x 7 way 0.1" connector for video (pin 3 removed) (Optional if using datasette header connection)
1 x 20 way 0.1" connector for keyboard (pin 2 removed) (Optional if using original keyboard)
1 x 9 way D right angled PCB socket (Optional if using RGBI monitor)
NOTES ON IC SELECTION
This board has been designed to work with 74HC series logic and modern WDC 65Cxx series chips. The W65C02S is not pin
compatible with the original NMOS 6502, and so nothing designed to plug into a 6502 socket should be used with the Mini
PET. No PET ROM/RAM, PET Diagnostics, 64K RAM boards or Super PET boards or anything not specifically designed for the
Mini PET will work in that socket.
The chips that act as external driver chips, the 74LS07s used to drive the IEEE-488 bus and the 74LS145 used to drive the
keyboard are not available in 74HC series, but this is not an issue as they all have open collector outputs and are driven
from NMOS outputs on the W65C21N / W65C22N.
ASSEMBLY
Assembly should follow standard procedures for this sort of kit. The following is offered as a guide to the order parts
should be assembled:
1. Single resistors, small capacitors and diodes (support board in a frame and solder from above can be easier than
soldering from below and having to keep flipping the board over)
2. Crystal and Logic ICs (if not fitting sockets, noting orientation of pin 1 circles or indents, all pin 1's are to the left)
3. IC sockets for remaining chips (noting orientation of pin 1 indents all pin 1's to the left hand side of the board)
4. Resistor arrays (noting the dot for pin 1 on the package and the board)
5. Large capacitor, LEDs, buzzer, switches, transistor, connectors etc.
Clean the board after assembly and check for any shorts or dry joints before inserting the ICs. Check jumpers and DIP
switches are set appropriately before powering on.

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PCB LAYOUT

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DIP SWITCHES
The recommended settings for the DIP switches are highlighted in green, all switches off.
ROM SETTINGS
The Mini PET can run a selection of ROM sets. Commodore ROMs used under license from Amiga Corporation.
Switch 1
Switch 2
40 Column
80 Column
OFF
OFF
MINI PET BASIC 4.1 *
MINI PET BASIC 4.1 *
ON
OFF
BASIC 4.0 #
BASIC 4.0 ǂ
OFF
ON
BASIC 2 #
Simple RAM Test
ON
ON
BASIC 1 #
Full RAM Test
# Original Commodore ROM set
ǂNon-original editor ROM with modified keyboard table
*Custom ROM set
*** COMMODORE BASIC ***
BASIC version 1 was supplied on the first 2001 PETs, and only supported the normal / graphics keyboard. It is
provided for completeness, and would not be recommended for general use due to a number of bugs,
particularly in the IEEE-488 support. The version here is usually referred to a 1r, which patched a few of those
bugs.
### COMMODORE BASIC ###
BASIC 2 was the standard version on the 2001N or 30xx machines, and has support for normal and business
keyboards. (You sometimes see version 1r referred to version 2 and this as version 3. None of these versions are
numbered until 4.0, so use whichever numbers you prefer).
*** COMMODORE BASIC 4.0 ***
BASIC 4 was supplied as an upgrade to 2001N and 30xx machines and also on the 40xx machines. It has
additional disk commands over BASIC 2, and came in 40 or 80 column versions.
*** MINI PET BASIC 4.1 ***
Mini PET BASIC is a custom version of BASIC 4, specifically for the Mini PET. This version has added support for
the sounder and several other improvements normally only found in later CRTC based PETs. There is a built in
automatically activated DOS Wedge (see later). This is the recommended ROM to use. It terms of hardware,
the Mini PET is closest to the original 4032 with the 2001N-32 board, but with many of the tweaks from the
later machines. There is also a built in file browser that can be activated using the NMI / Menu button.
PET TESTER –SIMPLE RAM TEST
PET Tester is a simple test ROM which tests the first 200 bytes of RAM and for each byte, display bfor bad or
gfor good. It alternates this with a screen showing the full character set. This is useful for testing monitors as
it gives you an easy way to get a screen full or characters. This version has been specially modified to alternate
between uppercase / graphics and lowercase / uppercase fonts.
SYSTEM TEST –FULL RAM TEST
This is a special build of the self diagnostics built into the Mini PET ROM sets. This tests system RAM and IO
chips, but will not test the ROM as it is running from its own ROM set. See later for further information on the
Self Test in each ROM set.

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FONT SETTINGS
The character ROM can be changed using switches 3 and 4. The default character ROM font is that found on
BASIC 2 and BASIC 4 PETs. The older BASIC 1 set, and two international sets are provided as alternatives. The
BASIC 1 set can be useful if when running software written to use lowercase mode on the PET 2001, and you
see tHE iNCORRECT cASE. (the BASIC 1 set seems more logical, not sure why they changed it?, but the BASIC
2/4 set should be used in most cases for the compatibility)
Switch 3
Switch 4
Character Set
Charset 1
Charset 2
OFF
OFF
901447-10 (BASIC 2/4)
Uppercase / Graphics
Lowercase / Uppercase
ON
OFF
901447-08 (BASIC 1)
Uppercase / Graphics
Uppercase / Lowercase
OFF
ON
German DIN
Uppercase / Graphics
Lowercase / Uppercase
ON
ON
Japanese
Uppercase / Graphics
Uppercase / Symbols
40/80 COLUMNS
The Mini PET 40/80 can generate a 40 column or an 80 column screen. This is supported on any of its video
outputs, although readability of 80 columns may be limited on smaller screens.
The Mini PET starts in 40 column mode, and the 40/80 button on the keyboard can be used to change mode.
Changing mode also changes the ROM selection, and resets the Mini PET. DIP switch 5 controls the mode that
is selected at power on.
Switch 5
Power on mode
OFF
40 column
ON
80 column
VIDEO OUTPUT
The Mini PET can generate a number of different video formats, selected with switches 6, 7 and 8.
Switch 6
Switch 7
Switch 8
Video output
OFF
OFF
OFF
NTSC Composite Video
ON
OFF
OFF
PAL Composite Video
OFF
ON
OFF
NTSC RGBI / CGA*
ON
ON
OFF
PAL RGBI*
OFF
OFF
ON
9” PET*
ON
OFF
ON
MDA / Hercules
OFF
ON
ON
12” PET/CBM 60 Hz
ON
ON
ON
12” PET/CBM 50 Hz
* Composite video is also generated in these modes (with less appropriate timing and positioning). If you have problems
with the main composite video modes on older monitors, try these modes instead.
TEXT MODE LINE GAPS
Switch 9 is used to enable a two pixel gap between each line of characters, to match 80 column PETs in text
mode. This is not available for NTSC / 60Hz modes of composite, RGBI and the 9” PET monitor (there are no
enough lines available). When selected, there will be a 2 pixel gap between each line in text mode. Graphics
mode remains without gaps in all cases.
Switch 9
Graphics mode
Text mode
OFF
8 Lines
8 Lines
ON
8 Lines
8 Lines + 2 Line Gap

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RGBI COLOUR
Although the Mini PET is a monochrome machine, the RGBI output can be configured as white on black or
green on black using switch 10. Switch 10 has no effect on other modes.
Switch 10
Colour
OFF
Green on black
ON
White on black
BUILT IN SELF TEST
The Mini PET BASIC ROM sets and BASIC 4 ROM sets include a built in self test in ROM at 0xA000.
To activate this, type SYS 40960.
This tests system RAM, ROM and some functionality of the IO chips. The tests will loop after the first pass is
completed, a counter at the bottom of the screen keeps count of the number of cycles and any errors
detected.
RESET BUTTON
The Mini PET reset button controls the video microcontroller. When reset, this provides a clean reset pulse to
the main CPU. The READY LED is off during reset to indicate this.
40/80 BUTTON
When the 40/80 button is pressed, the video mode is toggled between 40 and 80 column vide output. Since
these require different editor ROMs, when the button is pressed, the ROM is changed and the PET is reset to
boot up into the new mode.
NMI BUTTON
The Mini PET has a button wired to the NMI line of the 65C02S processor. On the Mini PET BASIC 4.1 ROM sets,
this is configured to activate the built in file browser. On other versions of BASIC, it will trigger a BASIC warm
start, and bring up the READY prompt.

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DOS WEDGE
The DOS Wedge gives a number of additional shortcut commands to access a disk drive, and is particularly
suited to use with the SD2PET SD card disk drive.
THIS IS BUILT IN TO THE MINI PET BASIC 4.1 ROMS, AND IS AUTOMATICALLY ACTIVATED AT POWER ON,
THERE IS NO NEED TO LOAD FROM DISK OR USE A SYS COMMAND.
If you are not using Mini PET BASIC 4.1, the standard BASIC 2 and BASIC 4 ROM sets also include the wedge as
an option ROM, starting at address 0xE900. To activate those versions, type SYS 59648
COMMANDS:
/filename –load the program filename
↑filename –load and run the program filename
@- Display drive status (at power on, this will show drive version information)
@$ - Display a directory of files (does not overwrite the current program like LOAD”$”,8 does)
@CD:folder –change into a subdirectory on the SD card
@CD:name.d64 –mount a disk image
@CD←–unmount a disk image (if mounted) or change to the parent folder
@C:new=source –create a copy of ‘source’ called ‘new’in the current folder
@R:new=old –rename a file from ‘old’ to ‘new’ in the current folder
@S:filename –scratch (delete) the file filename (you will not be asked for confirmation)
=- toggle font uppercase / lowercase and uppercase / graphics (BASIC 4.1 only)

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FILE BROWSER
A file browser is built into the MINI PET BASIC 4.1 ROM images. This is particularly suited to use with the
SD2PET SD card disk drive.
This can be activated by pressing the NMI / MENU button on the bottom right of the keyboard.
The standard BASIC 4 ROM sets also contain the file browser as an option ROM, at 0x9000. To activate those
versions, type SYS 36864 (or it can be easier to remember to type SYS 9*4096 ).
CONTROLS:
Up / down arrow keys –scroll through the list of files
Left /right arrow keys –scroll up or down one page of files
Return –load the select program change into the selected directory or mount the selected disk image
Clr / Home –Move up one directory, out of a disk image
S –Toggle sorting the list of files alphabetically
D –Cycle through the available drives 8,9,10,11 (if present)
Q –Quit and exit to BASIC
= –toggle font uppercase / lowercase and uppercase / graphics
When a program is selected, the Mini PET will be reset and the program automatically loaded and run.
Alternatively, you can browser to the appropriate folder and / or disk image and then exit to BASIC and load
the program as normal.
When you return to the file browser, the previously selected folder will be preserved or disk image will still be
mounted, to save having to browser back there again.