Go Speed Racer, Go!

WDC just put two expansion boards for their SBC's up for sale on Tindie.

The 65C816 expansion board includes 512K parallel SRAM, and so is probably the easiest way for a newb to add memory to the SBC.

https://www.tindie.com/products/wdc/w65c02edu-add-on-board-for-w65c02sxb/

https://www.tindie ...

DOS-65 license was probably restrictive because the murky status of CP/M, which has recently been open sourced.

https://blog.adafruit.com/2022/07/13/cp ... etronic80/

Hi everyone!

Hope everyone is doing well. I have a project that I've been working on off and on and I wanted some input and help. I'm currently building Grant Searle's 6502 microcomputer. It will run off of serial via an RS232 USB adapter. Currently, the chips that I'm working with are the 65(C)02 ...

It's not what you're asking for, vmarcus but I notice Jim Brain built Fake6509 which is, I gather, a workalike board to replace the 6509 - see
MOS 6509 look-alikes?
which links to the Nu6509 repo .

For backgrounders on the CBM-II line, see
https://www.floodgap.com/retrobits/ckb/secret/b128.html ...

To echo BigEd my second favorite was the Amiga. It was a great transition into modern-ish software architecture and tool chains without being as complex as a UNIX variant or as monolithic as MacOS. And you could always go and bang directly on registers if you needed to get something done the old ...

Hi Guys
i'm looking for a cgs65CE02 to my Apple //e, it is a Commodore version of 65c02, if anyone has one and wants to sell it, leave a message

That chip was only ever used in the Commodore serial expander for the Amiga 2000. It will be exceedingly hard to find. Especially because it is a 16-bit ...

If you are on Facebook you could try this group:

https://www.facebook.com/groups/6809ass ... 672991170/

I found the plots for the 4502 and 4510 to be very exciting since these chips are less studied than other variants.

https://commodore.international/2022/01/11/paper-plots-of-commodore-chip-layouts/?fbclid=IwAR3WlAGBuSbj7Wk3Oba3k6BdwlWuko0PKL1R3DwiONz_u4XS5nISMVc5LkQ

That being said, these should ...

How would the MCU see the external/shared block of RAM? Most MCUs do not have an external memory bus - I can't think of any, but they may exist.

To be fast though it really needs auto-increment, at least, and you could go more or less complex with that. The benefit though if that I think as soon as you're writing more than about half a dozen bytes, the cost of the CPU loading an address into the latches and then writing a line of bytes ...

Any thought of adding REU functionality to the accelerator?

You could probably add 256K-512K using the onboard memory of the Teensy.

The recent port of Sonic to the C64 requires an REU and this has put them into sudden demand.

There is currently an FPGA project for it (which has its own thread ...

I posted an update to the MCL64 project: https://microcorelabs.wordpress.com/2021/11/29/mcl64-update/

It appears that a number of Commodore 64 games rely on a few of the unstable undocumented opcodes, so I updated the code to support them.

This is very impressive. Hopefully in 2022 I will have ...

Unicorn Electronics also lists them as potentially in stock on their website for a fair price.

http://unicornelectronics.com/IC/GAL.html

But their stock is variable.

You can sometimes find kits like these on Tindie. Here is a great 816 kit that is in stock now:

https://www.tindie.com/products/c0pperd ... puter-kit/