http://forum.6502.org/images/migrated/059195-000.png

et voila! It works!

I was following the tutorial in the page linked very closely, but always had some doubt that the connection in the schematic doesn't go well with the logic it's going for (or at least, incomplete). So I re-arrange the whole ...

If you're following the linked schematic completely, then the system does not include any RAM, correct? If this is the case, then you can't use any instructions which require the stack, such as PHX, PHY, PLX, PLY, JSR, RTS, etc. as there's no memory available. Note that these instructions will also ...

I'm having trouble communicating with the ftdi rs232-ttl converter (5 pins) I'm using. The 5 pins are Vcc, Gnd, Rx, Tx, DTR and CTS.

Below is the connection from the usb ft232 to 65c51 chip. I've also grounded CTS pin on the 65c51 to enable the transmitter.

USB -> 65c51
Rx--->TxD
Tx--->RxD
DTR ...

I see mention of pulling BE up to Vcc, but no mention of doing so with RDY, IRQB and NMIB. None of these can be allowed to float.
:) Oh forgot to mention, I did put a pull-up 3k3 resistor for these pins too.

Welcome!

Hmm, A15 might be going at about 7Hz - that's very fast for a flicker but I ...

Greetings,

This is my first attempt at trying out building an 8-bit computer. I'm currently working out the circuit from the link:
http://www.grappendorf.net/projects/6502-home-computer/the-microprocessor.html

Since I'm using 65c02, there's a few changes I made from the link above:
1. I leave ...