... GREAT!! I was just talking with Daniel about making such projects open and GPL'ed - and it's already done! ... (Just an insignificant wish: my name is...
Bodo Wenzel
bodowenzel@...
Dec 2, 2001 7:36 pm
34
I just took a look to the SourceForge project and registered myself. But the verification didn't take place until now, so I'm still posting here. As companion...
Bodo Wenzel
bodowenzel@...
Dec 2, 2001 8:43 pm
35
You might know it or not: there's a living group of ZX users in germany. Only few of its 60+ members are active really, but they do interesting things. (Yes,...
Bodo Wenzel
bodowenzel@...
Dec 2, 2001 9:33 pm
36
Many apologies on my dyslexic reading ;) I'll try and keep it straight from now on. I am still suffering some connectivity issues (and total lack of being able...
You may be interested in grabbing these Xilinx chips as a group. I guess some company has moved onto denser chips so these are not commercial anymore but may...
Keith
keith@...
Dec 5, 2001 10:21 pm
38
without any pin constraints, into XC2S15 CS144 which is the smallest that can take it. Number of External IOBs 83 out of 86 96% Number of SLICEs...
Keith
keith@...
Dec 7, 2001 1:56 am
39
http://www.howell1964.freeserve.co.uk/logic/burched/b5_zx81.htm This links to my notes on the subject. NB it is just a technical study at the moment!...
Keith
keith@...
Dec 11, 2001 2:22 am
40
OK thats got me wanting one of those b5 boards. Are there any other boards that get a Spartan out to 0.1" headers? cya, Andrew......
I also got myself a BurchED board, and inspired by your web page I have also written a PS/2 to matrix keyboard encoder. Then I started to do some synthesis...
... That was quick. Was it hard? Did you start from the opensource code? It looked non-trivial to do from scratch. And have you tested it? If fully working it...
Keith
keith@...
Dec 18, 2001 3:27 am
43
Hi, Fitting the complete ZX81 in an XC2S200 is quite impressing, and I'd be very curious to know how much of the area is used by the Z80 core. However, as...
Eric
erv@...
Dec 24, 2001 9:18 pm
44
Hi. ... Great, Eric! I always liked this to be a small hobby project ;-) Maybe you like to contact Kai Fischer because he's currently redesigning his ZX2000...
Bodo Wenzel
bodowenzel@...
Dec 30, 2001 9:58 pm
45
... I'd be very ... About half of the logic and none of the block memory. It is however still not in any way optimized for synthesis and I belive it is...
"kvd_wallner" - could you mail me your VHDL for your PS/2 code to matrix converter? I've had a look at the PS/2 kbd code I have and I'd like to have a go at ...
Keith
keith@...
Jan 4, 2002 1:28 am
47
... matrix ... You can download it from the sourceforge cvs tree: http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/zxgate/zx/ext/...
I've made some progress with this, having modified some VHDL code from the web and ported it to the BurchED board. I can view the FIFO data and addresses on...
Keith
keith@...
Jan 14, 2002 1:33 am
49
Hi, I'm looking to produce my own FPGA dev board. The intention id to make it simular to the Burched board, but to use a bigger FPGA and to include things...
I am looking for (or will make my own) board to take a large FPGA out to .1" connectors so it can be used as a daughter board for simpler prototyping. I am...
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...
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