Commodore PET Projects
Version 1 Prototype
(minus the LCD)
Version 2 Prototype
(minus the LCD and clock module)
03/09/2018 petSD+ Version 2 PCB Modification
There have been a few minor tweaks to the
layout of the PCB, the main change is to relocate the LEDs to
better suit its installation in a 3D printed case, such as the
one designed by Stephan Both
petSD+ Version 2 will be available
for purchase in 2-3
I need to work out the final price, but
it will not be dissimilar to Version 1. It is my intention that,
come 1st February 2018, ALL new orders for petSD+ will be
supplied as Version 2. I had intended to discontinue supply of
Version 1, but it strikes me that there are possibly two groups
of prospective purchasers who may prefer the option of a new
Version 1 petSD+.
1. Existing Users who want a
like-for-like replacement/addition to their existing setup
2. Users who want to purchase the
manufactured by Michael Schön
If you fit into one of these two groups
and NEED a Version 1 petSD+ let me know when ordering.
17/01/2018 Created this
News" page, collating all previous newsworthy items
10/01/2018 Deluxe LCD Display
Update - the new displays have arrived
Note: the new displays use VATN
(Vertically Aligned Twisted Nematic) technology, rather than the
FSTN technology in the previous ones. In VATN displays, the
liquid crystals align vertically when the voltage is zero, this
creates a truly black background to the display. When voltage is
applied, the liquid crystals shift to a tilted position allowing
light to pass through and create a gray-scale display depending
on the amount of tilt generated by the electric field.
VATN displays have a super black background, there is no "bleed
through" of the backlight that could be seen on the FSTN
displays, they have a Super high contrast ratio and the text is
This obviously comes at a cost, but
if you do want to splash out on one of these screens, you won't
be disappointed !
Due to the low volume of sales and
difficulty in obtaining them, a number of the LCD colours have
been dropped from the "Order"
page. I have archived the discontinued options here . . . .
Discontinued LCD Options
To cater for the
environmentalists out there, who may be looking
to save energy, I have a limited number of
reflective LCD displays available. (There is
absolutely no truth in any rumors that these
were bought in error!)
"Deluxe" Colour Options
|This is the "Green on Black"
FSTN display that I am
was able to supply.
not apparent from the photo, but the colour is
very close to the display that Nils sent me,
shown above. In fact, I think that I will be
using the same supplier that Nils used.
No Longer Availabl
I can also supply it
in what was described as "Yellow on Black", the
photo makes it look very yellow, but the colour
is actually much closer to Amber on black, very
much like the colours of the
IBM Portable screen.
For comparison, this is the seller's photo
showing the display colour, this is a much
closer match to what the display looks like in
06/12/ 2017 No Longer Available
I also bought one
advertised as "Black letters, White background".
Again, the photo doesn't give a very good
representation of the colours, but as it
suggests, the display would be more accurately
described as "Dark Blue on Pale Blue" although
in reality, the blue is not as pronounced as the
It is definitely not Black
on White, but quite nice all the same.
For comparison, this is the seller's photo
showing the display colour, it does appear
closer to black and white, but, as I know now,
that is down to the quality of the photo, rather
than the actual colour.
06/12/2017 Deluxe LCD Display
Availability & Price
The "Deluxe" LCD Displays are proving
difficult to obtain and are now almost twice
the price that I paid the last time that I
ordered a batch. Orders for the deluxe
displays up to order number #72 have been
filled but have used up my stock of these
The Green on Black displays
proved to be the most popular "deluxe"
option, outselling the Amber on Black by
about 10:1. Given the low volume of sales of
the Amber displays, I will not be restocking
these unless specifically requested to
provide them (which will result in an 10-12
week delay before I could obtain them).
I do intend to continue to stock the
Green on Black displays and have 10
additional displays on back order but the
supplier has advised that they will not be
shipped until week 6 or 7 2018. I also need
to pass on some (but not all) of the
additional price to buyers, therefore, the
enhanced screen option will now be £12
If anyone can point
me to alternative sources of these displays
I would appreciate it. If I can get the
displays cheaper, then I will reduce the
20/06/2017 Third party case
Michael Schön (plexilaser.de)
has created a nice acrylic case for petSD+
and is making it available though his
webshop. The case is priced at €19.00
including VAT (shipping extra). You can see
a couple of
photos on my "Ordering" page or on Michael's website.
website is in German, use Google Chrome to
have the page automatically translated for
you, a local copy of the page, translated into English,
27/09/2016 Price Increase
Effective 01 October 2016
As I live in the UK, petSD+ prices are
quoted, and must be paid for, in UK pounds. Over the past year,
exchange rates have dropped significantly, sterling having
dropped from ~$1.5 USD or 1.4 Euros in October 2015 to ~ $1.3
USD or 1.1 Euros today.
Since I source most of the parts in
Europe or the USA, it has become significantly more expensive
for me to make petSD+, but the effective price for most
customers has actually reduced from about $105/E91 to around
For the supply of petSD+ to remain
viable, I need to increase the sterling prices of the kits and
assembled units by 10% (less than the 15% exchange rate
difference). This change will only really impact the very small
minority of customers who are in the UK - international
customers will not see any increase over the Dollar/Euro
estimated prices on this page - they will just not get as large
a currency discount as they have seen over the past year, but
will still pay a little less than my estimated prices.
01/06/2016 Status Update
The current version of the firmware for petSD+
now fully supports disk read/write functions and the
Real Time Clock, in addition, the LCD can now be
used to change the Device Address, change directory
and load disk
loader is able to re-flash the MCU from a binary
file copied to the SD card, no additional user
programming of petSD+ is required. The firmware
compatible with all versions of petSD/perSD+.
A copy of the
firmware binary file, is available from an
auto-generated nightlies page on Nils' site.
A modified version 2 PCB is currently being designed by Nils,
but this may take a little while to make it into production.
Version 2 is likely to feature enhanced control of the LCD
brightness and contrast using PWM and a few other minor
the meantime, a slightly modified
version "1.2" board is now on order, it corrects a
number of minor issues with earlier versions of the board
(1.0, 1.1, 1.1a), including :-
the MISO connection issue
described in Nils'
on his web page. (This issue is only relevant to petSD+ boards
that have the ISP port connector fitted which will not be needed
by most users anyway).
removal of the redundant capacitor, C12
petSD+ now supports IEC
(Serial IEEE-488), i.e. Commodore 64 (requires custom cable)
A modified Editor ROM with integral DOS Wedge is really a great step
forward . . .
Every petSD+ owner should have one!
To that end, I have been investigating the
possibility of being able to create one and
supplying it as an option for petSD+ purchasers.
Read the latest developments on
17/10//2015 Component C12 can,
and should, be removed from ALL petSD+ devices shipped prior to
17th October 2015.
Provided that you have some basic
tools, removal of C12 is straightforward. As C12 is
located behind the PREV
button, if the LCD screen is fitted it should be
temporarily disconnected to allow C12 to be removed
- more details
If you would have difficulty
in doing this yourself, drop me an e-mail and we can
try and work something out.