Search found 240 matches
- Sun May 26, 2024 10:11 am
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
These are the final specs of my hobby project fpga ZX8301 replacement and QL upgrade Card. There is a small board that replaces the zx8301 and connects to the card with a 2-wire cable. It uses a relatively new and cheap Intel Cyclone 10 LP fpga. CPU For cpu it uses the MC68HC001 in the 68008 compati...
- Fri May 17, 2024 6:25 pm
- Forum: Hardware
- Topic: CPLD replacement for ZX8301
- Replies: 237
- Views: 59485
Re: CPLD replacement for ZX8301
Vitaliy (tetroid) designed a very compact pcb of almost the size of the ZX8301 IC for the cpld replacement and I adjusted the pinout of the cpld to fit.
So now there is a nice compact version that works with GC and SGC.
So now there is a nice compact version that works with GC and SGC.
- Mon Apr 29, 2024 10:01 am
- Forum: Hardware
- Topic: Announcing the new "Gold Card" - QIMSI Gold
- Replies: 55
- Views: 5744
Re: Announcing the new "Gold Card" - QIMSI Gold
Fantastic work Peter and the team I see you use simple resistors to do the 3.3V to 5V interfacing, that saves lot of space and makes the design much less complicated. Do you have also added the clamp diode option to all the pins ? In my board I used 6 small ics for the same thing but at least now I ...
- Thu Apr 25, 2024 11:27 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
Yes and this with an 8-bit bus vs 16 bit of Gold card but speed is not everything.
I'll try to make a batch after more testing to every QL I can find.
I'll try to make a batch after more testing to every QL I can find.
- Thu Apr 25, 2024 6:07 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
But this I think it is the final version maybe with only minor changes.
- Thu Apr 25, 2024 12:54 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
Hi Yes there are totally useless pins and one nc pin I think, so if one wishes he could use them, also the wires are not needed for issue 6 and 7 boards. I like it protruding but maybe a bit less, I make pcb's fast because as you have noticed I change the specs and features constantly :D ( I hope fo...
- Wed Apr 24, 2024 6:03 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
Thank you
I forgot to mention it is now running at 16Mhz and I intend to add a fast serial port SER3.
I forgot to mention it is now running at 16Mhz and I intend to add a fast serial port SER3.
- Wed Apr 24, 2024 4:35 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
As Peter and one's complement suggested an expansion card board is ready and it solves many problems. It also needs two wires and a small board over zx8301 socket but it is so much easier to install and no need for 3d printed plate for the ports. I also changed fpga to the newer cyclone 10 LP that I...
- Tue Apr 09, 2024 9:04 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
It started as 2 separate boards but then I made a single board to eliminate the cables, that was ok in my ql with the changed sockets. It was when I tested it to another QL I realized the height problem :( I didn't tied the unused inputs to a fixed voltage because their outputs are always disabled (...
- Sun Apr 07, 2024 8:49 pm
- Forum: Hardware
- Topic: FPGA replacment for the ZX8301 ULA and more
- Replies: 270
- Views: 107002
Re: FPGA replacment for the ZX8301 ULA and more
thanks for the idea, we will see.
First I'll test the short pins tetroid suggested.
First I'll test the short pins tetroid suggested.