[Oberon] Smallest Oberon board ever made?
magnus at saanlima.com
Sat Jan 9 01:17:36 CET 2021
Monochrome video framebuffer takes 96 KB (1024 x 768 / 8).
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
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.
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.
On 1/8/2021 3:49 PM, Pablo Cayuela wrote:
> Oh!, it's really amazing the level of integration, and even the micro
> connectors appear big against the chips.
> If BRAM is for monochrome video memory, how much is it?
> The 128 kB caché is part of the 8 MB PSRAM chip (IPS6404) or where it
> 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.
> Congratulations Magnus for such a wonderful board.
> Best regards,
> Prof Pablo Cayuela
> On Fri, Jan 8, 2021 at 5:04 PM Magnus Karlsson <magnus at saanlima.com
> <mailto:magnus at saanlima.com>> wrote:
> I have been playing around with a concept of an Oberon board smaller
> than RPI zero just for fun.
> The board is 60 x 25mm in size and runs the Oberon disk image from
> projectOberon without modifications.
> It has an 8 MB PSRAM chip so with software changes it supports an 8MB
> Oberon system.
> FPGA: Artix 7-50
> KB/Mouse via PS2
> Video via microHDMI
> Serial/Power via microUSB
> 8 status LED
> 4 DIP switches
> reset/abort switch
> nRF24 RF chip with uFL antenna connector
> 8 MB PSRAM chip (IPS6404) via 128kB cache
> Video frame buffer in BRAM (mono)
> microSD socket
> As you can see in the images below the PS2 connectors are huge
> to the rest!
> Booting: https://www.saanlima.com/images/Oberon_zero/IMG_5862.MOV
> The novel thing about this board is the use of a small QSPI PSRAM as
> main memory.
> Oberon at lists.inf.ethz.ch <mailto:Oberon at lists.inf.ethz.ch> mailing
> list for ETH Oberon and related systems
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
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