The punch, of course, is a bigger problem. I'm not really sure what to do about that. It's possible actually to print tapes (on clear arcrylic or perhaps thin paper), but part of the whole appeal for me is that with paper tape your physical media is quite sturdy, so long as it's stored reasonably ...

I had pretty much the same goals when I built my 65C816 based SBC in 2016. I also postponed the Mass Storage to later and so added a small IO bus to the SBC to add a 8-bit IDE Interface for CF Cards later.

http://forum.6502.org/viewtopic.php?f=4&t=4195

In addition it emulated an Apple II.

It ...

65C816 soft core (I've searched around and it doesn't seem to be one freely available)
Forum member Rob Finch posted his bc65816 core on his web site, here .

-- Jeff

Thanks. Missed that one. I saw on one site that there was no 65C816 soft core available and looked no further.
Unfortunately it ...

I've given it some more thought, and I'm going to throw an FPGA at it. Just because I've got one :).
I wanted to put many things inside of the CPLD, and I would need a large one anyways. An FPGA, with some amount of internal RAM, PLLs and other nice stuff eases initial development (we'll see about ...

I've wired up a 65C816 in a breadboard with an EEPROM, some address decoding & data bus buffer, and a latch connected to some LEDs. No RAM yet. I just made a simple program to get the LEDs to count, and it just works. (Well, you have to slow the clock down in order to see something...). I also tried ...

I did include a 74HC245 bus transceiver in the block diagram. Without it video RAM accesses would collide with bank address put out by the '816.
Juan

The objective:
------------------
A 65C816 based SBC, with built in VGA and keyboard interface, UART, and some sort of mass storage. I want it to be as self-contained as possible, meaning that it should be able to operate without being connected to a PC, and being able to write code for it on itself ...

congrats on finishing the project!

if i may suggest, you could start with CPLDs if you want to stick with "hardware design" projects. because there is only so much you can do with TTL chips...
you could for example try to rebuild the CPU or the video card with them.

the ATF150x series is pretty ...

Impressive!

-Gordon
Thanks! I'm looking at your Ruby pages, planning my next project.

Juan: Nice video, and congratulations on finishing this project.

Looking forward to see, if you might be out to build a faster/better TTL CPU in a few years from now.

Cheers,
Dieter.

Thanks! I may very ...

Some updates:
____________________________

Since the last post I have written some programs:

-Simple PONG game in BASIC.
-An Apple II-like assembler and disassembler. It's pretty limited, it can only handle hexadecimal values and it's quite unforgiving with syntax and such (an absolute address has ...

Nice work! As you say, not a 6502, surely a microcontroller, and quite plausibly a relative of the 8751 or 8951.

One of the tactics for decapsulating epoxy is to heat and twist - there are videos out there. For example
https://www.youtube.com/watch?v=ZQeHHYJYWXo

Seen that. The hair dryer I have ...

I purchased five of this ICs off eBay. This is what arrived: Manufacturing date 2019. On the top, Mexico, on the bottom, Taiwan and a handful of scratches.
I wouldn't mind much if they worked. I hooked them up on a breadboard, providing power (5V) and tying reset, IRQ, NMI and SO high by 1K ...

There are some nice SMPS 7805 drop-in units that are far more efficient and don't get hot! I've used the Traco Power TSR 1-2450 in some projects with good results.

Cheers,

-Gordon
Thanks. I wasn't aware of those. I did have a SMPS but it was putting out 4 V and the computer wasn't very happy ...

Some updates:

I've added a new heatsink for the voltage regulator as it was getting too hot. Now I can keep my finger on it for as long as I want, so it should be fine.
-----------------------
I've been working on the last card, the UART.
As I intended, I implemented it in a CPLD, an Altera Max II ...

Glad you found an effective remedy. FWIW, it's possible to get diode arrays intended for clamping (see below). But the discrete diodes may be easier to retrofit into your project.[...]

Good to know. Yes in this case discrete diodes were easier. Chips on the top, bodges on the bottom...
Hopefully ...