Search found 38 matches
- Fri May 17, 2024 2:53 pm
- Forum: Hardware
- Topic: External board for SPonZY (and other ZX81 ROMs)
- Replies: 1
- Views: 225
External board for SPonZY (and other ZX81 ROMs)
Based on my prototype I've created a small simple PCB in order to run SPonZY external on a ZX81. You can see the protoype in this post The prototype chaos turned out to be working anyway :-) Interface supports W27C512 - a 64KiB EEPROM and can operate in two modes: 1) 8 banks of 8KiB each or 2) 4 ban...
- Fri May 03, 2024 5:55 pm
- Forum: Hardware
- Topic: ZX81 External ROM
- Replies: 2
- Views: 779
Re: ZX81 External ROM
KiCad and Gerber files will be released on GitHub as soon as I have done the final testing.
- Wed May 01, 2024 11:57 pm
- Forum: Hardware
- Topic: ZX81 External ROM
- Replies: 2
- Views: 779
ZX81 External ROM
Testing out my new External multi ROM and Expansion Bus extender :-) 8 ROM banks of size 8192 bytes, selected with DIP - BUT requires the original ROM in ZX81 because of display generation, tested with the followin ZX81 ROMs: * 550, 622, 649, SG and X2 Also tested, but not working correctly because ...
- Sun Apr 28, 2024 10:19 am
- Forum: Hardware
- Topic: Wilf's CHR$X16
- Replies: 2
- Views: 1450
Re: Wilf's CHR$X16
OK - so after 3 tries it finally pays off - got a version running that seems to be working fine. Only thing is that font table is selected by setting I=n*4 only, and not adding 224 as described in Wilfs documentation. Not sure if its mine that has a flaw in the wiring or eprom programming - but hey,...
- Mon Apr 22, 2024 10:02 am
- Forum: Hardware
- Topic: Wilf's CHR$X16
- Replies: 2
- Views: 1450
Wilf's CHR$X16
Hi, Just want to hear if someone has build the CHR$X16 as described by Wilf? image002.gif I'm asking, because I've tried but ran into some smaller issued - just want to hear from someone, that it can be done, before diving into more detailed investigation of my board. It looks semi ok, but as can be...
- Sat Apr 20, 2024 1:34 pm
- Forum: ZX BASIC
- Topic: SPeccy ON the ZeddY
- Replies: 101
- Views: 69799
Re: SPeccy ON the ZeddY
I decided to give this a go on real hardware as well, trying to avoid opening and modifying the ZX81. Only modification to my setup, which has been done long time ago - My ZX81 has internal 16K RAM upgrade (WRX compatible) and a composite mod. I know it looks like chaos, but huuraaa - it's working -...
- Mon Mar 04, 2024 11:23 pm
- Forum: Software
- Topic: Software Preservation
- Replies: 9
- Views: 13203
Re: Software Preservation
I think I understand the reason for using tzx, it allows the creation of very accurate tape images and allows to pack many program blocks in a single file. Probably excessive accuracy is even uncomfortable (I'm thinking at the leading noise in a tape), but it is still possible to extract a P file f...
- Sun Dec 17, 2023 8:57 pm
- Forum: Software
- Topic: Software Preservation
- Replies: 9
- Views: 13203
Re: Software Preservation
Monkey Kong - Scan-Bit-Software (SBS)
Requires 16K Ram and version 1 of the rom
Entry at spectrumcomputing
Requires 16K Ram and version 1 of the rom
Entry at spectrumcomputing
- Thu Sep 14, 2023 4:23 pm
- Forum: Software
- Topic: Software Preservation
- Replies: 9
- Views: 13203
Re: Software Preservation
I am using the ZX81 Tape Converter found her: https://www.zx81stuff.org.uk/zx81/tapeutils/overview.html It also has the option to save as P file, I just forgot - but will try to remember next time. Creating a P from TZX should be easy in most cases, but I don’t know of any tools that can do that. Pl...
- Tue Aug 15, 2023 10:34 pm
- Forum: Software
- Topic: Software Preservation
- Replies: 9
- Views: 13203
Re: Software Preservation
Squeeze Play - Scan-Bit-Software (SBS)
Requires 16K Ram and version 2 of the rom
Entry at spectrumcomputing
Requires 16K Ram and version 2 of the rom
Entry at spectrumcomputing