No more switching memory boards or jumpers! Currently you have to make a choice about what software you want to run when you plug in a memory card into an RC2014. That's because the capabilities of...Read More…
Currently you have to make a choice about what software you want to run when you plug in a memory card into an RC2014. That's because the capabilities of the memory card are designed to work with different software systems. For instance there are:
I wasn't happy with multiple RC2014 rigs or switching memory boards and jumpers every time I wanted to run a different kind of software. So I've designed this board which combines the best features of all these kinds of board in one:
This kit is compatible with 512K ROM 512K RAM. With the jumper set to Paged position and chip U1 set to ROM a standard RomWBW image functions as it would in a 512K ROM 512K RAM board. In this configuration the PAGE line is supported so single-step debugging with BusRaider is possible. If a RAM chip is installed as U1 then BusRaider can program the chip with a ROM image as it understands the paging mechanism.
With the board in linear mode a Z180 can access the full memory space with its 20 bit address bus and, in addition, a BusRaider can switch the board temporarily to paged mode so that it can access the full memory space using its 16 bit bus. This allows BusRaider to load software like ROM images directly into linear memory space for development, testing and quick switches from one mode to another.
So a system with a BusRaider (see separate Tindie listing) and this board in a PRO bus with a Z80 or Z180 processor card, you can seamlessly support machines as diverse as a a TRS80, a Z180 with linear addressing and a paged system running CP/M or similar. All without changing any jumpers!
As mentioned above, none of the currently available cards support the PAGE signal on the RC2014 bus which the BusRaider uses to request that all memory cards are disabled to allow a bus-master to put data directly onto the processors data bus. This feature is used by BusRaider to support single-step for instance.
The kit includes:
Please note that this is a hobby project and no warranties or guarantees of any kind are provided and no liabilities will be accepted under any circumstances.
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Gerald | June 26, 2020
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