![]() In order to improve the 'QL Speed' accuracy of Q-emuLator, I plan to better account for the 8049 timings (simulating the interaction between the 68008 andthe ZX8301 ULA will also be necessary, but that's a topic for another day). There are a few copies of the QL IPC code on the internet and they are all the same, apart for a single unused byte toward the end of the ROM. This also means that if you need to replace an IPC chip, you cannot just buy any available 8049: It needs to come from a QL, or it will contain a different, incompatible ROM. Sinclair wrote the code, but it got programmed in the chip by the manufacturer, and there is no way to reprogram it. ![]() The code is stored in an internal 2 KB ROM. This can cause a significant slowdown of QL software and the exact timing depends on the code that runs on the IPC. Communication between the 60008 and IPC uses a slow serial link and can only happen when the IPC is in-between activities like scanning the keyboard or producing the next segment of a sound.
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