The hardware for that would be comically simple. If you develop the calls/traps, the hardware will definitely be available for you to play on. More interestingly, it would be fairly easy to just have a DPRAM "bridge" card than could then accept one or multiple CPU cards. I have some 64Kx16...

I plan to discontinue the ROM port after Issue 8 as the image can be saved in flash and relocated. I found the connectors to be very difficult to source, and quite expensive at £5/00 a piece. Therefore, I will be offering it as a built time option - if you don't want it, your Issue 8 board will be ...

(01983) 861342 seems to be their number.

I can't call it from the US though - well not economically.

But that can be better done with fast SERial 68681 (one of the reasons why I'm doing it); 31250 MIDI option with opto-isolators along with full SER. Take a look at the NXP SCC2691. It has an auto-repeater feature which make the in/thru/out implementation not require any extra repeater hardware. App...

But that can be better done with fast SERial 68681 (one of the reasons why I'm doing it); 31250 MIDI option with opto-isolators along with full SER. You'd have to change the crystal to get the right baud rate out of the 68681, so you would need to use a separate 68681 for MIDI and for serial. If th...

But it does not contain the QL-side email client, which is where the procedures of communication with the server need to be handled, and where the ESP32 functions would need to be attached. The QL-side software for that does not automatically exist, just because there is a piece of ESP32 hardware. ...

I wonder if a pragmatic approach, like finding or hosting classic email servers, could help without "outsourcing" encryption to a non-native CPU. (By the way, I'm not sure that an encryption engine outside the QL would automatically lead to the development of an email client which can han...

I find it exaggerated to say that TCP/IP is useless without encryption. It can still be used for LAN connections, internet connections from QL to QL, and many websites. From my experience with QLwIP I see the largest problem in the requirement of encryption for email server connections. (Which does...

Derek_Stewart wrote:I have not checked them against the original, but they look about right.

So Dn -> ZAn and An -> ZDn? Why would they do that?

....for a basic system you don’t need dual port RAM. One third party Z80 second processor system for the Acorn BBC B used two PIO chips back-back for processor to processor communications. In this case a 6522 VIA for the 6502 and a 8255A for the Z80A. Nothing *needs* dual port RAM. But: If I put a ...