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Plugging Kabuki into an old Amstrad CPC 6128 without the security pin pulled high allowed to test all the Z80 instructions, and with that no surprises were found the Kabuki is fully compatible with every other Z80 on the planet. The security – just a few bits saved in memory – was battery backed, and once this battery was disconnected, the chip would fail, killing the game. When the pin was pulled high, it served as a power supply input for the security features. With this pin low, the Kabuki was a standard Z80. While the normal Z80 CPU had a pin specifically dedicated to refreshing DRAM, the Kabuki repurposed this pin for the security functions on the chip.
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It’s an interesting part of arcade history, but also a problem for curators: this security has killed a number of arcade machines, leading to reverse engineering and document the Kabuki in full detail. why would Capcom produce such a thing? To combat bootleggers that would copy and reproduce arcade games without royalties going to the original publisher. The brains in the hardware of these games is a Kabuki, a Z80 CPU that had a few extra security features. They’re old, yes, but what makes these titles exceptional is the CPU they run on. There are a few old Capcom arcade titles – Pang, Cadillacs and Dinosaurs, and Block Block – that are unlike anything else ever seen in the world of coin-ops. Thanks to for the tip! Posted in ARM, classic hacks Tagged arm, mbed, retrocomputing, sinclair zx81, vga, z80, zx81 This isn’t the first time we’ve seen a ZX81, but it is one of the better implementations of an emulated version of this system we’ve seen. To be true to the original, he built everything into an original ZX81 case. Then he went about getting a picture to display on the screen, then he interfaced an SD card and a keyboard to his new machine.
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started by modifying a very lean Z80 emulator to make the compiled code run as efficiently as possible on the mbed. Another reason for the choice was that his mbed-VGA device could only output monochrome color, which was another characteristic of the ZX81. It was ’s first computer, so it was a natural choice for him to try to emulate. With more than 1.5 million units sold, the Sinclair ZX81 was a fairly popular computer in the early ’80s. But what could he do with something with VGA out? He decided to emulate an entire Sinclair ZX81 computer, of course. Using only a few resistors, the mbed was connected to a VGA display running at 640×480. was working on getting a VGA output running on an mbed platform without using (hardly) any discrete components. This is a wonderful example of the phenomenon of “feature creep”. Eventually, he even managed to port BASIC to his system.Ĭheck out ’s awesome article Home Computers behind the Iron Curtain and the follow up article on Peripherals behind the Iron Curtain, where you can read more about the “one pin” BT100 printer.Ĭontinue reading “The RUM 80 – A Home Brew Z80 Computer Built From Scratch” → Posted in classic hacks, computer hacks Tagged 8251, 8255, basic, BT100, clone, cpm, Czech, Czechoslovakia, z80 Since the Z80 had dual registers, one was used for user interaction, while the other was reserved to allow background printing.
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He wrote this from scratch referring to the Z80 instruction set for help.
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On the software side, he wrote his own monitor program, which allowed simple interactions, such as displaying and modifying registers, memory, I/O ports and to run programs.
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This had an 8251 serial interface for cassette deck, one 8-bit D/A converter, and an 8255 parallel port connected to the “one pin” BT100 printer. When he ran out of space on the main board, he built an expansion board. He even built the membrane keyboard – describing it as “layers of cuprextit, gum, paper with painted keys and transparent film”. documented the schematics, but there is no board layout – since the whole thing was discrete wired. The enclosure is completely made from copper clad laminate. It featured the 8-bit Z80 processor CPU, 8kB EPROM with monitor and BASIC, two Z80 CTC timers, an 8255 parallel interface for keyboard and external connector, 64kB DRAM, and Video output in black & white, 40×25 characters, connected to a TV. ’s built was based around the Z80 processor and is built using regular, double-sided, prototyping board. Even the erstwhile Czechoslovakia had home computers available from Didaktik and Tesla. Those living in western Europe and the Americas could choose offerings from Acorn, Apple, Commodore, Atari, Radio Shack, and Sinclair Research to name just a few. The list of home computers available in the 1980’s is extensive. Between 19, built his own home brew, Z80 based computer. Recently tipped us off about hacker from the Czech Republic.