6303 serial

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We found and based on your interests. Choose more interests. The board implements an expanded mode set up and generates Z80 like signals from the CPU in order to drive the bus. One 74HC demultiplexes the lower address and data lines.

The second one is present as the recommended workaround for the fact that you can get big transients when the lower address lines switch to data, and buffers the upper address lines which if there are power problems or a lot of capacitance can otherwise wobble when driving a high capacitance load - like a backplane. The spare port when running multiplexed is brought out on the top of the board for purposes yet undefined it's an 8bit GPIO port so quite flexible.

Port 2 is brought out for the TTL serial and the other port 2 pins are just strapped to get the desired boot mode. Clocking is a bit different to the other boards I've made.

There is a jumper to put the actual E clock on pin 39 a user pin but it's actually not very useful without RW. If I do a rework of the board I'll move it to pin 38 with RW on pin 39 and x peripherals would prefer to have both, and already uses pin 39 for RW. Zip Archive - View all 8 files.

View all 9 components. The is a descendent of the so the question of support naturally comes up. As far as I can tell the only difference of relevance is that the R has Vcc on pin 21 and a standby signal on pin 21, whilst the has Vcc on pin 7 and Vstandby for the iram on pin If I am reading the manuals right it should be sufficient to replace R4 with a wire link to run a processor.

Once I have one to hand I will test. The board is booting and able to load a bootblock off a CF adapter and run it correctly. I'm currently turning the core of cc65 into cc, as well as adding it to the Fuzix assembler based off the freed up MWC one and the linker I wrote. There may therefore be a delay before any more visible software progress happens on the board itself. View all 3 project logs. Create an account to leave a comment. Log In. EtchedPixels - is the cpu board i should be targeting for my 8-bit VGA card dev?

Are you sure? I have the disassembly of the code. You could try to execute code from e. IIRC, 68hc11 we used didn't have remapable devices and eeproms, but perhaps some hc05s and hc 9 08s had, they really knocked themselves out with them, that was like Baroque and Rococo, luxury and a something for everyone. I had to check 68hc11 data sheet, and you are right and I was wrong about remapping internal RAM and registers. I remembered that we had a fragmented memory map, but I guess that was because of the internal eeprom.

This is nifty! AFAIK it will actually run code, but it has additional instructions that the doesn't have, amongst other interesting features.