@bitluni same in the UK.
And they wonder why people don’t use public transport?

@fmn Well, it doesn't work and I've spent about a week on it. so at best I've lost that time.

@xoofx I use KiCAD, it's free and not cloud based, so it's always there.
PCBs are made by JLCPCB but I hand assemble them.

Sadly I could not get it working, Basically I've got it working on a teensy, captured all the data going in/out (lots of print statements to print to the console) and rebuilt the code from that.

Here is what I have in my basic code https://github.com/TechPaula/PC6502/blob/main/Software/BASIC/SPI_DISP_HELLOWORLD.BAS

and here is the output of the program https://github.com/TechPaula/PC6502/blob/main/Software/BASIC/SPI_DISP_HELLOWORLD_OUTPUT.TXT

the output of the teensy console is here - https://github.com/TechPaula/PC6502/blob/main/Software/BASIC/tnsy-disp-spi-CONSOLE_OUTPUT.txt

I'm at a loss :(

Finally after several days, I’ve managed to get the start of display initialisation code in for my #PC6502 stack and I can write and read data to/from the display using SPI (65SPI2).

Console output -

RUN
RA8875 INIT:
CMDWrite>: 0x80 CMD>:0x00
DATAREAD>: 0x40 Data<:0x75

Ready

So the next step is to add in rest of the init code and try to write hellos world on it.

@rasteri twatter is a cespit of bigotry and hate, I left a few years back.
As for the transphobia, most of the time I just ignore it, they're just stupid small minded people who are trying to find someone to hate because their lives are empty.
Also, my pet peeve, it's not a phobia, it's not a fear, it's bigotry.
As this stain on the carpet, he can join the other small minded morons like JKR on my "who gives a sh1t" list :)

@rasteri society has taught us that to be successful and get money you have to be a selfish twat.

@mntmn it is better than altium which is integrated. The problem with that is switching between PCB and schematic only works as long as you don’t Havr a dialogue box open as it appears to lock up.

@hkz Thanks!
I'll give that a go tomorrow!

@hkz Thanks, I could never figure out how to link the PDP11GUI to my DCJ11 serial port... I should try again..

@DosFox nope, I just hate it... way to peopley

@hkz I'd be interested to get hold of your BASIC and cross compiler, my own project with a DCJ11 hit a problem due to not having a compiler and my inability to wrap my head around octal - https://files.mastodon.social/media_attachments/files/112/949/922/703/035/503/original/a1038c23709444d2.mp4

@speaktrap Thank you.

@zoeblade I've been toying making a 68K in a 3U high VME backplane I have.
There's a guy who makes clones of early acorn stuff in 3U too.

In more positive news for my #PC6502 stack, @shonky ported EhBASIC and the enhanced WozMon to the platform!
EhBASIC is slightly quicker than OSI basic, but the main thing for me is the ability to handle hex for values!

Code and Binary in my repo.

Picture of the logic analyser on the outputs (the two boards in the previous picture are 5v to 3.3V logic level shifters)

showing the command and data write to the display (which matches the timing diagram of the RA8875 datasheet - https://www.buydisplay.com/download/ic/RA8875.pdf)

and I know I can write to a register, and read back what I wrote.

I've even tried an SPI screen and used my logic analyser to capture the initialisation and text send for "hello world" and recreated that, to no avail.

I feel like I'm missing something silly that's stopping it, but after about 20 hours on this, I admit I need some help :(

Picture of a blank screen with back light on.

---- PRINT TEXT ----
CMD:$40 SENTData:$81
CMD:$02 SENTData:$48
H SENTData:$65
e SENTData:$6C
l SENTData:$6C
l SENTData:$6F
o SENTData:$20
SENTData:$77
w SENTData:$6F
o SENTData:$72
r SENTData:$6C
l SENTData:$64
d
DONE

Ready