Search found 176 matches

by PiyoTaro
Thu May 30, 2019 5:24 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

To avoid conflicts with port 0xfe, you must check that A0=1. And to avoid conflicts with ports xxFD, A1:A0 must not be "01". I removed the 'A0' and assigned it to the other pin (A8) for the circuit that had been examined and decoded the lower 8bits so far. The address '$xxF5' has been assigned but ...
by PiyoTaro
Tue May 28, 2019 7:25 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

2019/6/2 There was a problem solution. PCB board module does not work Hmmm. I will search the literature for "/IORQULA". :shock: --- Solution: If there is a conflicting problem in decoding the "even" address , will the problem not occur if "A0" is not used? I will try prototyping using "A9" instead...
by PiyoTaro
Mon May 27, 2019 7:06 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

Hmmm. I will search the literature for "/IORQULA". :shock: I was told that this is a function after "ZX Spectrum +2". --- Solution: If there is a conflicting problem in decoding the "even" address , will the problem not occur if "A0" is not used? “A0” is connected to the sound chip “A0”. In addition...
by PiyoTaro
Mon May 27, 2019 6:28 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

I am no expert but, as you say you will need to be in 48k or 128k mode and disable any conflicting devices. Definitely do not run above 3.5Mhz for the expansion BUS to work - later versions of the system will likely disable it at higher speeds anyway. I think you have already found that the -5v sig...
by PiyoTaro
Mon May 27, 2019 6:05 pm
Forum: ZX Spectrum Next
Topic: Help: Legacy peripherals do not work on my 2A board
Replies: 8
Views: 757

Re: Legacy ROM mode help!/Re: Help: Legacy peripherals do not work on my 2A board

The archive "esxdos086.zip" currently published on "www.esxdos.org" does not have the 'ESXMMC.BIN' file in the answer. I first posted the question that ' ESXMMC.ROM ' in the root directory of the "esxdos086.zip" archive didn't work if it was unpacked to tbblue. And I just posted about "Rename and us...
by PiyoTaro
Mon May 27, 2019 2:51 pm
Forum: ZX Spectrum Next
Topic: Help: Legacy peripherals do not work on my 2A board
Replies: 8
Views: 757

Re: Legacy ROM mode help!/Re: Help: Legacy peripherals do not work on my 2A board

Supplement. The previous version of the SD card up to "Distribution v.0.9" contained a file "RENAME-TO-WORKesxmmc.rom". The old "Startup Guide" description seems to be usable by changing the name of this file. It did not work when I put this file on the current version of the card. About the Legacy ...
by PiyoTaro
Thu May 23, 2019 5:31 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Do not work!/Re: Design a small Sound card for Next

My "layout diagram" drawn in 2.54mm increments without understanding the "layer" was manufactured as a double-sided printed circuit board. The cost is $19.(Photo. May 17) (The article continues) PCB board module does not work (Photo. May 17) 20190523_20190517mypcb_top.jpg 20190523_20190517mypcb_bot...
by PiyoTaro
Thu May 23, 2019 5:22 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

This project aims at a small FM sound card that can be put on the pin header terminal CN5 (on the ZX Spectrum Next board) . Prototype the FM sound module. --- I mounted the components on the board at last weekend. Compare with the layout (Postscript. The wiring could not be shown because only 3 pho...
by PiyoTaro
Thu May 23, 2019 5:01 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

Let's discuss "connectors and cases" first after my prototype works , and then investigate how many people want them as products. First of all my prototype is not working. It is necessary to verify why the decoder circuit was designed by "my misunderstanding" or whether the implementation of the ext...
by PiyoTaro
Thu May 23, 2019 1:30 pm
Forum: ZX Spectrum (and Clones)
Topic: Design a small Sound card for Next
Replies: 23
Views: 2647

Re: Design a small Sound card for Next

Have you seen https://www.tindie.com/products/TRC/zx-spectrum-edge-connector/ $2.25 when 10+ units ordered Back in the day companies were producing different expansion add ons. Some were plain through connectors either fixed or with a cable and I had one where was like a T junction so you had a ver...