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<div class="moz-cite-prefix">Thanks!</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Monochrome video framebuffer takes 96
KB (1024 x 768 / 8). <br>
The Artix7-50 has 300 KB of BRAM, of which 128 KB is used for
cache, 96 KB used for video memory, 2 KB for boot memory and 74 KB
not used at the moment.</div>
<div class="moz-cite-prefix">The address of the video framebuffer
can be changed via a register so that it can be moved from the
default location at the end of the lower 1 MB so above the 8 MB
range.</div>
<div class="moz-cite-prefix">The IPS6404 is an odd memory.
Expressif, the maker of the very popular ESP8266 and ESP32
wireless microcontrollers also makes (or rebrands) this part for
use with ESP32. <br>
<a class="moz-txt-link-freetext" href="https://www.espressif.com/sites/default/files/documentation/esp-psram64_esp-psram64h_datasheet_en.pdf">https://www.espressif.com/sites/default/files/documentation/esp-psram64_esp-psram64h_datasheet_en.pdf</a></div>
<div class="moz-cite-prefix"><a class="moz-txt-link-freetext" href="https://www.aliexpress.com/i/4000218445956.html">https://www.aliexpress.com/i/4000218445956.html</a></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Cheers,</div>
<div class="moz-cite-prefix">Magnus</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 1/8/2021 3:49 PM, Pablo Cayuela
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CABM0idxnVcLy0FKyA_WufaxaUaYSbQuUQqTvrXvMY+ZVjj-mZQ@mail.gmail.com">
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<div dir="ltr">
<div>Oh!, it's really amazing the level of integration, and even
the micro connectors appear big against the chips.</div>
<div>If BRAM is for monochrome video memory, how much is it?</div>
<div>The 128 kB caché is part of the 8 MB PSRAM chip (IPS6404)
or where it resides? <br>
</div>
<div>The IPS6404, is it acquirable? How much is the cost? I read
on the IPUS site "for limited customers only", maybe you're
one of them.</div>
<div><br>
</div>
<div>Congratulations Magnus for such a wonderful board.</div>
<div><br>
</div>
<div>Best regards,</div>
<div>Prof Pablo Cayuela</div>
<div>Argentina</div>
<div><br>
</div>
<div><br>
</div>
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jan 8, 2021 at 5:04 PM
Magnus Karlsson <<a href="mailto:magnus@saanlima.com"
target="_blank" moz-do-not-send="true">magnus@saanlima.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I
have been playing around with a concept of an Oberon board
smaller <br>
than RPI zero just for fun.<br>
The board is 60 x 25mm in size and runs the Oberon disk image
from <br>
projectOberon without modifications.<br>
It has an 8 MB PSRAM chip so with software changes it supports
an 8MB <br>
Oberon system.<br>
<br>
FPGA: Artix 7-50<br>
KB/Mouse via PS2<br>
Video via microHDMI<br>
Serial/Power via microUSB<br>
8 status LED<br>
4 DIP switches<br>
reset/abort switch<br>
nRF24 RF chip with uFL antenna connector<br>
8 MB PSRAM chip (IPS6404) via 128kB cache<br>
Video frame buffer in BRAM (mono)<br>
microSD socket<br>
<br>
As you can see in the images below the PS2 connectors are huge
compared <br>
to the rest!<br>
<br>
<a href="https://www.saanlima.com/images/Oberon_zero/OZ3.jpg"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.saanlima.com/images/Oberon_zero/OZ3.jpg</a><br>
<a href="https://www.saanlima.com/images/Oberon_zero/OZ1s.jpg"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.saanlima.com/images/Oberon_zero/OZ1s.jpg</a><br>
<a href="https://www.saanlima.com/images/Oberon_zero/OZ2s.jpg"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.saanlima.com/images/Oberon_zero/OZ2s.jpg</a><br>
<br>
Booting: <a
href="https://www.saanlima.com/images/Oberon_zero/IMG_5862.MOV"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://www.saanlima.com/images/Oberon_zero/IMG_5862.MOV</a><br>
<br>
The novel thing about this board is the use of a small QSPI
PSRAM as <br>
main memory.<br>
<br>
Cheers,<br>
Magnus<br>
<br>
--<br>
<a href="mailto:Oberon@lists.inf.ethz.ch" target="_blank"
moz-do-not-send="true">Oberon@lists.inf.ethz.ch</a> mailing
list for ETH Oberon and related systems<br>
<a href="https://lists.inf.ethz.ch/mailman/listinfo/oberon"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://lists.inf.ethz.ch/mailman/listinfo/oberon</a><br>
</blockquote>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">--
<a class="moz-txt-link-abbreviated" href="mailto:Oberon@lists.inf.ethz.ch">Oberon@lists.inf.ethz.ch</a> mailing list for ETH Oberon and related systems
<a class="moz-txt-link-freetext" href="https://lists.inf.ethz.ch/mailman/listinfo/oberon">https://lists.inf.ethz.ch/mailman/listinfo/oberon</a>
</pre>
</blockquote>
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