Due to a project at work that was supposed to be finished in december but lasted until february I haven't been able to make the progress I was hoping to, but...
Hi Daniel, great to see some progress, hope I can pick up the pace a bit and release some good news soon... cya, Andrew... ... december ... soon. ... <snip>...
Hi Daniel, It is an impressive effort to create a Z80 core and make it publically available. Well done! I'm sure that you've put a lot of work into it. I was...
tantaubax
tantaubax@...
Mar 1, 2002 11:06 am
55
Hi Daniel, I'm sure I can answer some of your Z80 opcode questions, if you specify them more verbose ;-) But surely there are other "gurus" out here who know...
Bodo Wenzel
bodowenzel@...
Mar 1, 2002 6:38 pm
56
... When I know everything works, I will be impressed to :) Actually, writing a small low performace CPU core isn't that much work, except for one thing, the...
... Actually, what I wanted to know was if the zx81 needs exact instruction timing in order to work, the interrupt cycles and the IX/IY offset fetch does...
... Only for the opcodes that are executed while rendering the screen. But you don't know what opcodes are used by HRG programmers, sometimes they use strange...
Bodo Wenzel
bodowenzel@...
Mar 10, 2002 9:05 am
59
Now I have fixed some more bugs in my z80 and as the halt, the interrupts and the refresh address now seems correct I hope I will find the rest of the bugs...
Hi, on the 2002 meeting of the german ZX-Team (did anyone of you watch the chat or the webcam?) we looked for a bug with Kai Fischer's new ZX2000 (see ...
Bodo Wenzel
bodowenzel@...
Mar 18, 2002 4:28 pm
61
Now I have gotten my Z80 core to run in hardware. I tested the core with a NoICE monitor and 4k RAM on the BurchED board and I have been able to run the zex...
... This is in my old source code: video <= '0' when i_n_sync='0' else 'Z' when i_video='0' else '1'; The output generates '0' for sync pulses, and 'Z' and '1'...
Bodo Wenzel
bodowenzel@...
Apr 7, 2002 5:23 pm
63
The single chip zx81 is now up and running. I have not verified everything yet but I have been able to run BASIC programs on it. I'm not sure what the problem...
... I'm ... of ... support ... Excellent news! Would there be any problems with hooking up the standard expansion port? ... Go for it! I imagine BurchED...
... My measurements of the original ULA show the inactive hsync, too. You may simply xor it in... I don't know if it has an influence on saving programs....
Bodo Wenzel
bodowenzel@...
Apr 14, 2002 8:22 am
66
I have released the edif netlist for zx01, added the trs80 files and also added a Jupiter ACE implementation to sourceforge. I'm not sure about the copyright...
Hi, If you have visited zxgates's sourceforge project page lately you may have noticed some updates. If not, here's what I have done: I have updated the home...
Hello, I don't know much about fpgas or vhdl - but whats the smallest, most economical fpga to fit the spectrum ULA in? - I don't need the ROM, RAM or...
... That depends on what you want to do. The ULA itself is very small, it would probably fit in the smallest FPGA you can find. But then you would need to use...
Actually, after looking at the code I thought most of the instructions wouldn't be that difficult. SLEEP would require a little work to fully implement but...
The instruction timing is different. It could be done, it would take a lot of work. I guess if it was slowly migrated it would be handy, some of my z180 code ...
If you run the processor at a faster speed code like that would break anyway. There's only one piece of code I've written that would work that that way that I...
Is there anyone on this list who is into z80 vhdl and crypto? I am looking at porting pgp onto a z80 with some hardware acelleration for the crypto. I am good...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the zxgate group. File : /Click here for...
zxgate@yahoogroups.com
Nov 8, 2003 12:40 pm
82
I am working on a ZX81 machine code program. I have a question. I believe the answer may have appeared in SYNC Magazine (Vol.3 No.6, featuring "Machine...
You can find the rom listing at http://www.wearmouth.demon.co.uk/zx81.htm <http://www.wearmouth.demon.co.uk/zx81.htm> Interesting bits for you below. cya,...
All: I am building a Z80 Core on OpenCores. This core differs from the t80 core that some of you are familiar with in a couple of ways.. 1) Written in verilog...
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