Sorry about the smiley face. I didn't notice it until I read your reply. And your right that I had my < and > backwards. It should have been the other way around.

I found out what it is doing is a greater than and less than comparison. I think it defaults to compairing to zero if another variable ...

I got my answer. I need to be doing the following:

TEST NOP
LDX #(TEST >> ; LOAD ADDRH
LDY #(TEST & $FF) ; LOAD ADDRL

Thanks.
Ken Guenther

Hello,

I am trying to write a program and I'm using the TASM Assember to assemble it. I need to be able to load the high address bit and low address bit into the registars. All the 6502 assembler books I have say I can to it like this:

TEST NOP
LDY #<TEST ;load ADDRH into Y
LDX #>TEST ;load ...

> I think a solution may have been posted to this forum, so just do a search.

You'll find the recent discussion on this by going to
6502.org Forum Index -> Hardware
and then clicking on "6502 Hardware Single-step". At the time of this writing, it's four lines down from this subject just started ...

Can someone give me a quick explination on how to single step the 6502 processor? Is it just a matter of hooking up the RDY line to +V and have a switch on that line so it goes high every time I push the switch? Then push the switch every time I want to execute an instruction?

Thank you.
Ken ...

I found my problem. I was looking at everything late last night and relized I had U4 and U5 reversed. Most of the schematics have u4 on the left and u5 on the right. One of the schematics on the web site has it reversed and I hadn't noticed that. So now I have to reverse some of the wires going to ...

John,

I don't have a logic probe but I'll get one. Here are the differences that I found between the schematic and the wire list that was given on the web site. The biggest differences are in the chip select signals (which I understand the least but I'm trying to learn). Any help would be ...

I am trying to build Douglas Beattie's DIY-6502 computer. I have it assembled and I loaded the BB0010A.AS program on my EEPROM to test it. But I don't get any output to my terminal. It should display "01234567" but I don't get anything. I am a little confused about some of my connections because the ...