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2023-02-26
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*************************************
1541 mark II Progress Update
*************************************
http://www.1541ultimate.net/
1541U-II Progress
Hello everyone!
It is about time to release some news
about the 1541U-II. I think some of
you must be really curious about the
extra features and possibilities that
the 1541U-II give, and about the
progress on production and firmware.
To start off with the 1541U-II
features, I can tell you that it
differs from the 'standard' 1541U
Plus/Ethernet that:
the board itself is about 30% smaller
than the 1541U;
it has a MicroSD connector, instead
of a full-size SD;
it has a real-time-clock function,
for correct file time and date;
it has a larger FPGA, which enables
the implementation of more features;
it has a USB Host port, which can be
used to connect USB-sticks;
it is targeted to have a suitable
case for the device.
Some of you have written in the
forums, that the MicroSD connector is
not much of an improvement. But the
rationale behind going to MicroSD is
mainly the available space on the
board is less, and that with the
addition of a USB-A port, the average
user will use the USB-stick rather
than the SD-card. So the MicroSD-card
does not need to be removed from the
cartridge very often. However,
because at the moment that I
announced the 1541U-II, the USB port
was not yet tested, I could not
reveal this feature as I did not want
to make promises that I can't keep.
The USB turns out to be quite a bit
of work to get it to work, but I can
now announce that I managed to
implement enough of a host-controller
function to be able to talk to USB
devices and send the most basic
commands to access a mass-storage
device. I am quite close to have
implemented the 'read-block' and
'write-block' functions, which is the
interface level that the file system
module uses. In other words, I expect
to be able to access the (FAT)
file-system on the USB stick quite
soon!
How will it work for the user? My
objective is to have one 'directory'
level above the current root of the
SD-card, where you can select which
partition you want to browse. There
the USB flash drive becomes visible,
as well as the MicroSD card, if
present.
Why has the Ethernet function
disappeared? The rationale behind
this, is also space. However, another
consideration is the shitty interface
of the CS8900A chip. This chip is
slow and creates quite a challenge to
get the timing right on the C64 slot.
It works now, but there are quite
some tricks to make it work, and it
will probably only work in 95% of the
cases. Because I want the 1541U to be
a quality product, I decided that it
would be better to emulate the
CS8900A chip in the future inside the
FPGA, and transfer the data over USB,
by means of an external
USB-to-Ethernet converter. This will
not only be cheaper, but also more
reliable. However, everyone knows
that implementation of these things
take time, so I am not offering this
functionality from the start.
Production status: All components are
on stock at the assembly company for
100 boards. Once the PCB is ready,
the assembly company will build the
boards for me. Hopefully, the case
will be done by the time that the
boards come, too. The design of the
case has been finalized, but to find
a company that can make a mould for
this, is quite another issue. I have
offers from different companies that
differ in price by a factor of 5! It
will be a huge investment for me, and
therefore I need time to select the
right company for making this special
case. Therefore, I don't expect the
cases before Christmas. :-( For this
very reason, I have not yet opened
"payment season", because I do not
feel good when people pay and have to
wait long before I can ship. It gives
me a lot of stress.
Some time ago, I already had a
prototype made by a company that uses
a 3D printer, based on some kind of
ink-jet system. Below you can see the
result, including the new 1541U-II
board on the left. Note, that the
final case will *not* be transparent.
It will be either black or cream
I hope you will be enthusiastic about
the new developments. I would love to
hear about your thoughts and ideas,
but beware that I can't answer all
E-mails. At this moment, I only have
3 days every 2 weeks that I can use
to spend time on the 1541U project.
Regards,
Gideon
http://www.1541ultimate.net/content/
index.php
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