Next big step done:
implementing 6551 transmit/receive and a extended version of wozmon:
https://hackaday.io/project/186414-w650 ... 5c51-die-2

Mow the next evolution is coming, a simple basic...

I believe the DCDB input must be low for the receiver to work (check the datasheet) Not sure how your hardware is wired using the ftdi, it does not show the DCDB connection.

Daryl
Hmm, in the datasheet DCDB only fires up an interrupt. It doesn't block the receiver from reciving...

You’ve got ...

After 5 china r65c51, no one works correctly, I bought a W65C51 plcc28 version from mouser.de, build an plcc28/dil adapter. Interface clock generation seems OK, because transmit is working correct. Schematic is here
download/file.php?id=15678&mode=view

Hi there,

i have a strange problem.
i'm working on my W6502SBC code, implementing Wozmon.
But first I wanted to make sure that the W65C51 (incl. adapter) works properly.
So I created a few small routines that write and read.
The write part now works satisfactorily. The only problem is the reading ...

Sure, this are Pin strip RM 2.54mm, straight, 1-row, 36-pin with round contacts 0.5mm.
https://www.reichelt.de/stiftleiste-rm-2-54mm-gerade-1-reihig-36-polig-w-p-952-12-036-1-p331060.html?&nbc=1
Its my favorite distributor for my personal use.
Here is the datasheet:
https://www.reichelt.de/index ...

Adapter time,

PCB have come and seems to work.

i just processed your files with cupl itsself and it says:

c:\Wincupl\Shared\cupl.exe -xu c:\wincupl\shared\atmel.dl 2
cuplx
[0010cx] line(35) invalid preprocessor command: $000000-$00bfff
[0010cx] line(36) invalid preprocessor command: $00c000-$00c3ff
[0010cx] line(37) invalid preprocessor ...

Just ordered a W65C51 in PLCC package and an adapter for it.
Just in case.
The MAX3100 variant is now on the breadboard, got my first try with arduino, because of checking the schematics. Working.

Thanks for the hints.

@BigEd
Yeah, i know, thats why i ordered a bunch of 6551, but I hoped to find at least one good one. But 100% scrap is a bit high...

@floobydust
The problem with utsource here in Germany is that the shipping costs are way too high.
€26.96 (that's almost the same in $ at the ...

Just a short comment the R65C51 (from china) are driving me crazy. I have 4 of them, bought together, but every chip from the outside is different. 3 PlasticDip one ceramic, 3 with the Rockwell logo one without…
And in my PCB every chip behaves different. The ceramic chip doesn’t the oscillator, one ...

Here is the cmd file, which also starts the simulation after compiling, for the atmel stuff:

@echo off
set LIBCUPL=e:\Wincupl\Shared\atmel.dl
e:\Wincupl\Shared\cupl.exe -jaxfsl %1


i use another tool before this, because i like to have one file for pld and simulation. So i made a small go tool ...

Hmm, so would it be possible to set DOSbox up to directly start the CUPL commandline program with whatever file you want as its input parameter?
Or what program do you use to run DOS applications?

WinCUPL is only a GUI for the cupl tool, located in the shared folder. You have to use some flags on ...

My experience, the Win part of WinCUPL has many problems on Win 10/11. I didn't get it running.
Cupl on the other side (the DOS app behind) had no issue. So I made some Script for starting it directly. And a little tool, that generate both files (pld and Sim) from one source.

…
one alternative (if your SBC has a serial connector) is to write a small Serial Bootloader (like Arduinos have) so you don't need to touch the ROM again to try out programs as they can simply be loaded into and executed from the SBC's RAM. that's what i did for both my 65c02 and 65c816 SBCs and ...

Here is the current progress, not much but for me ok:
- working LC-Display with 4-Bit interface
- Jiffy Clock (20ms)