Port to Glitchwrks 6502 SBC?

[ajacocks]

This is a new WDC 6502-based SBC:

https://www.tindie.com/products/glitchwrks/glitch-works-6502-single-board-computer/

It is quite fast, and has a bunch of onboard functionality, as well as being expandable with various peripherals, including a CF card interface. It seems a natural plaform for CP/M 65.

I can put you in touch with the creator, if you are interested, but it's already well documented as well.

[ajacocks]

If you have any suggestions on getting started with such a port, that would help, as well.

[davidgiven]

Hello! Sorry, missed the notification...

It looks like an interesting device, and very easy to port to. I'd look at the Sorbus implementation, which is very bare-bones: https://github.com/davidgiven/cpm65/blob/master/src/arch/sorbus/sorbus.S

You will need some form of mass storage. To begin with you could use a ROMdisk on the flash chip, but of course this couldn't be modified. I don't see an SD card or SPI interface board available, but there's a 6522 so bitbanging something like this would be easy: https://learn.adafruit.com/spi-fram-2mbit-4mbit/overview (I'd recommend FRAM over flash because then you don't have to implement flash levelling in 6502 machine code).

Looking at the memory map, I'd probably have the BIOS in flash for startup but have it relocate itself to the bottom of RAM as soon as it starts up. This would free up the 4kB ROM page for use in accessing the ROMdisk.

[ajacocks]

Not a problem! Here is the storage interface:
https://www.tindie.com/products/glitchwrks/glitch-works-compactflash-adapter-for-glitchbus/