Thanks for the tip Nightmaretony. I had lots of trouble to get the chips placed in a manner, that allowed Eagle's Autorouter to manage to route them all. Each autoroute attempt took some 45mins of CPU time and that with the PCB boardsize of just touch under 28 sqrt.inches. It is big, but it just ...

Hullo all,

This is just to let you guys know, that while the project has indeed slowed down to complete halt since my last post, it is again picking up speed since this project is supposed to be my EE degree Thesis work and my deadlines are approaching ;) So, here is a picture of the routed ...

After much silence, an update:

The SBC is now rebuilt with GAL chips. Ended up using one GAL20V8 and one GAL16V8 to replace the whole lot of TTL. I also took some advice and tied some signals with the phi2 to get more accurate timing and to avoid some trigger signals being present before other ...

As out SBC is nearing completion and we're very much intrested in using EhBASIC on it. We, or I anyway, have couple of things that I'd be intrested in knowing.

Firstly, how is EhBASIC in terms of retargetability? We would have the need to be able to load the interpreter into any given memory ...

It is not a feature of SIMMs, but rather, the DRAM chips themselves.

How are you handling the refresh on the simm?

I'm utilizing the built-in CBR (CAS-Before-RAS) refresh capability on the DRAMs on the SIMM module. I'm using inverted CPU clock along with NAND gates to invert the normal RAS->CAS cycle to init the refresh. The refresh occurs therefore at every ...

Update:

GALBlast built and couple of GAL16V8's aquired along with most of the SBCs discrete TTL logic area re-designed to accommodate the said chips. Trying to bend my brain around the programming language for GAL chips so I hopefully get to do tests soon.

It has been done my Mr. Lee Davidson here on 6502.org when he interfaced a ISA slot into his Vic20 to use a 3Com NIC. Link

Is there anywhere yet where your design is visible?

Unfortunately, as of yet, no. I've deliberately avoided posting schematics at this point because of the problems with the design. However, once those get sorted, they will be made available along with the firmware, some pictures, all of the ...

Imagine my surprise when I read through this page recently and discovered Janik's system is so similar to my own... except he's further along than me.

Hello. That doesn't actually come as much of a surprise. Most of my design is stol... umm.. 'borrowed' from various sources as well along with ...

Just an update:

It has been a while and not much has been happening during that time due to various school and work-related delays. However, I managed to run some test-code in the system and stumbled upon couple of things that need fixing. One problem with the SIMM memory and one with I/O timing ...

Hello,

Any news regarding on EhBasic on native 65816 mode?

Also, how difficult would it be to make EhBasic to work as a interpreter for Basic programs in a system with multiple other processess running?

Update:

The system ran it's first piece of test-code yesterday evening resulting an glorious "foo" being outputted to the terminal window of an another machine. Took only two tries no less due to not thinking straight with the character codes the first time around ;)

To come: Another, more ...

Do you plan on supporting the FAT16 file format or will you use another format? (FAT16 would be great for CF as they could be swapped from SBC to PC for development of software and data transfer)

We haven't thought to that extend as of yet, but the idea certainly is a very good one.

I hope you ...

Hello folks,

Couple of friends (ccureau, Bor_ed) and I threw some ideas around some months back about building our own singleboard computer which would be based, ofcourse, on 6502 or 65816. Having said that, what followed was some tight discussions upon features over complexivity of the design ...