Search found 164 matches

by rune
Thu Dec 06, 2018 7:38 pm
Forum: Development
Topic: New to Machine code, help required
Replies: 17
Views: 2241

Re: New to Machine code, help required

Hi Panther, where does the 726 value come from? The standard screen is 22 lines x 32 columns so 704 positions. Also, if you press the CONT key, your first routine will print another screen of characters... Thats because the JR NZ tests the value of the A Register, you are decrementing BC. So, the ro...
by rune
Mon Jul 02, 2018 11:56 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 43538

Re: ZX81 ULA-in-a-CPLD

Thanks Andy,

have subscribed to new topic.

Dave
by rune
Mon Jul 02, 2018 11:38 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 43538

Re: ZX81 ULA-in-a-CPLD

Hi Andy,

i have same question as Martin. I'd like to order/buy two.

Dave
by rune
Tue Jun 05, 2018 11:13 am
Forum: Development
Topic: ZX81 ULA-in-a-CPLD
Replies: 233
Views: 43538

Re: ZX81 ULA-in-a-CPLD

:D Everyone wants to buy one/some. Make a big batch please.
by rune
Wed Jan 31, 2018 6:44 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

Very, very nice
by rune
Sat Jan 20, 2018 7:33 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

A bit more info on my build. Dont buy the IC "packs" from ebay. I got some new CPLDs from elsewhere the first out the packet programmed immediately. Then the Eprom wasnt recognised in either of my programmers. Another eprom programmed fine. Next the test - lots of coloured squares and the Z80 gettin...
by rune
Sat Jan 06, 2018 4:27 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

Hi Claudius, The CPLD programming failed, below is the log file. Can you say if its the file, the programmer or the board that is the problem/ Info (209060): Started Programmer operation at Sat Jan 06 15:20:41 2018 Info (209006): Unrecognized device Error (209001): JTAG ID code specified in JEDEC ST...
by rune
Thu Jan 04, 2018 8:16 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

Hi, the Quartus software hadnt installed correctly. Probably my fault. But the links above sorted it out. I've now got to the point where Im ready to try burning the CPLD.... Once I solder on the CLPD socket which just arrived today. Will report back on progress when i get it done, probably at the w...
by rune
Wed Jan 03, 2018 10:10 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

The Library was downloaded, but the exe doesnt seem to be although I think I used the download manager on the page. How do I install the Library? Does the exe pick it up when installing? I dont know if i'll get much more done tonight as Im up at stupid oclock in the morning for work and need to get ...
by rune
Wed Jan 03, 2018 9:56 pm
Forum: Hardware
Topic: zx spectrum in zx81 case
Replies: 63
Views: 13777

Re: zx spectrum in zx81 case

Cheers Claudius I got as far as the drivers. Theres nothing in the Quertus folder other than a Common folder. Have I installed the wrong package? There is a folder at the same level called: modelsim_ase and drivers folder inside that. Im installing Flex IT 9 ? drivers just now from C:\altera\13.0sp1...