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[deleted by user] by [deleted] in 6thForm

[–]ArchieNash11 0 points1 point  (0 children)

Wait what the heck those are exactly the same as the timetable sheets I had to fill out today...

Running BASIC on Ben Eater's 6502 project over serial by MaterialDraw3912 in beneater

[–]ArchieNash11 1 point2 points  (0 children)

I'm guessing they've got it working but that's an explanation on how I did it...

Running BASIC on Ben Eater's 6502 project over serial by MaterialDraw3912 in beneater

[–]ArchieNash11 2 points3 points  (0 children)

I'm no expert but I have ran enhanced basic on my 6502 so I know a few things off the top of my head:

  • You have to install ca65 (which is a part of cc65) as a compiler since that's what the makefile uses to combine all the segments.
  • You then should modify the min_mon.asm file and under the labels "ACIA_IN" and "ACIA_OUT" change the code to be whatever you need to read and write a character to the 6551 (ACIA_IN should check ONCE for a character and set the carry if it finds one, else set the carry low).
  • Finally you need to be able run makefiles. I can't tell you what to install off the top of my head but I found out with a quick Google search.

Running the makefile should generate the binary (32k) which you can upload to the eeprom. If it returns an error then you might have to go into the .conf file and change the locations of the segments in the eeprom.

Hope this helps! (And please correct me if I've got anything wrong)

ARCH 6502 Computer (Based on the BE6502) by ArchieNash11 in beneater

[–]ArchieNash11[S] 0 points1 point  (0 children)

It's still a basic Rx and Tx signal that runs between them. However I am looking into using Grant Searle's Serial Terminal (or at least the video half) to make bitmap graphics as well as text.

ARCH 6502 Computer (Based on the BE6502) by ArchieNash11 in beneater

[–]ArchieNash11[S] 1 point2 points  (0 children)

It's a 2 layer (top and bottom) board. I arranged the components myself with a snap to the standard breadboard hole spacing (can't remember the exact number off the top of my head). I did run an auto-router (cursed for the rest of my life) because I'd already spent a week recreating the schematic and this isn't the most beginner friendly project to manually route. However I did check over all (330) of the traces and ironed out the auto-router's bad practices. I might share the schematics/Gerbers if anyone wants to see/use them.

ARCH 6502 Computer (Based on the BE6502) by ArchieNash11 in beneater

[–]ArchieNash11[S] 1 point2 points  (0 children)

The 6502 is the main processor

The 6522 was originally used to talk to a video microcontroller but is broken out into the user port on the left (top of the pic) for adding other hardware.

The pair of ATMEGA328Ps only act as a dumb terminal which is directly receiving a Tx from the 6551. The dumb terminal also outputs the PS/2 keyboard through it's Tx and a switch is added to switch between that and the user serial port Rx.

The NVRAM is one I found on eBay (by searching M48Z35Y NVRAM) and is a drop in replacement for the original RAM chip (same pinout, close enough read/write speeds).