Search found 52 matches
- Fri Jan 08, 2021 4:55 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
I didn't notice the DB9 connector until I looked at the recent picture. Is that a standard RS232 port? Yes like Mark says it is a Joystick port. A serial port on a ZX81 is much rarer than a joystick port and hence has less software out there that can use one. There is some mention of using WESPI to...
- Fri Jan 08, 2021 4:51 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
OK, I have been working on getting the YMZ284 sound going today. Well after quite a bit of RTFM I found a few issues with my design. I only roughed it out on this first version as I was pretty sure it was not going to work as this was a new design. Well, the first hint is that for IO decoding there ...
- Tue Jan 05, 2021 10:23 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
Easier on the ZX21 as pretty much all the signals are on one of three debug connectors.
- Sun Jan 03, 2021 3:33 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
Suggestion: - Add the internal 32k ram with the Wrx patch . - Add an address rom mirroring for the offset $0004=$7F to $FF (by switch ?) 32k >> if address data=$0004 + \romcs + \Mreq = DATA>$FF Zx ROM to init the memory room: (set the ram_top to $FFFF) 0000 D3;FD OUT ($FD),A ; ZX81 NMI GENERATOR 00...
- Fri Jan 01, 2021 2:34 am
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
Happy new year all. 2021 the year of the ZX21 project!
- Wed Dec 30, 2020 10:13 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
Hi, Is a Bluetooth module can be used instead of the ESP32 on ZX-Wespi project ? For input or output transferts: Bluetooth-Audio-Transmitter-Module-Board-4-1-Stereo-Audio-GFSK-Transceiver-Wireless-Speaker-Headphones-KCX-BT Bluetooth-Audio-Transmitter-Module-Board-4-1-Stereo-Audio-GFSK-Transceiver-W...
- Tue Dec 29, 2020 7:48 pm
- Forum: Hardware
- Topic: Faulty dk'tronics KEYBOARD
- Replies: 8
- Views: 2164
Re: Faulty dk'tronics KEYBOARD
Thanks for the replies. The switch on top was the P key and I did try contact cleaner and much bashing. I did take it apart but the bit of metal inside was not in a good way and I gave up trying to make it work again.
- Tue Dec 29, 2020 4:20 pm
- Forum: Hardware
- Topic: Faulty dk'tronics KEYBOARD
- Replies: 8
- Views: 2164
Faulty dk'tronics KEYBOARD
Also I could not see any other keyboards just like this on the web (repeat key and no numeric keypad) does anyone have information about this model. (I was given it by a friend).
- Mon Dec 28, 2020 5:41 pm
- Forum: Development
- Topic: ZX21 Project ZX81 Replacement PCB
- Replies: 61
- Views: 22595
Re: ZX21 Project ZX81 Replacement PCB
I am starting to look at getting the sound working. I have a "organ" program typed in from the zonx81 manual.
- Mon Dec 28, 2020 4:45 pm
- Forum: Hardware
- Topic: Internal AY-8912, has anyone tried it?
- Replies: 16
- Views: 3727
Re: Internal AY-8912, has anyone tried it?
I am working on getting the ZX21 sound working. I am using the YMZ-284 chip board option and I have typed some of the programs in from the ZONX81 Manual (Ian Priddey).
I will as at the very least add the .p files to my github.
I will as at the very least add the .p files to my github.