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Started by sigh, 13:21, 23 December 10
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Quote from: sigh on 19:19, 26 December 10Hmmm. Well the C128 still only had room for 8 hardwars sprites compared to the PLUS 16 hardware sprites. However, the dimensions were larger on the C128. The ultimate 8bit is looking like the MSX Turbo R at the moment.....
Quote from: sigh on 03:06, 27 December 10http://www.youtube.com/watch?v=tcZBtk7JkScHere's a shmup on the MSX called Space Manbow. Very nice graphics and the sound is excellent.The PC engine indeed had an 8bit CPU but a 16 bit GPU. More like a hybrid machine. I never really felt that the PC engine was an 8 bit machine...
Quote from: steve on 04:24, 27 December 10The turbo R must surely qualify as a 16bit computer, as the R800 processor had a 16bit ALU which makes it a 16 bit processor and the 9958 graphics controller probably also uses 16bit processing to speed up screen drawing.The modern successor to the z80 is the eZ80 which can execute up to one instruction per clock cycle by using a 16 bit ALU and a pipelined architecture with a top speed of 50mhz, but I will not argue if anyone produces an accelerator for the cpc/+ using it, I would jump at the chance of a compatible machine running at a speed equivalent to a 200mhz z80, add a blitter and 16 bit DAC with DMA for sound and we may have a machine that is faster than an accelerated Amiga.And for 100% compatibility it should load software from cassette tapes.
Quote from: sigh on 04:41, 27 December 10Yup, your right! It is 16 bit! Okay - I vote Amstrad Plus as being the most poweful 8 bit machine
Quote from: steve on 05:51, 27 December 10Not so fast, the sam coupe is probably the most powerful, if you don't count hobbyist projects like the v680p+ @ 16mhz with blitter, there are even people building new S100 systems using a 10 mhz z80, not the fastest, but an interesting project if you want that type of system.
Quote from: phi2x on 12:20, 27 December 10R800 is Z80 compatible, uses the same 8-bit registers, and has an 8-bit data bus. It's true that it has an internal 16-bit ALU but that doesn't make it a 16-bit processor.It's even better than that. According to Wikipedia, eZ80 has a 24-bit ALU.
Quote from: MacDeath on 13:18, 27 December 10Were 8 bit "duocore" ever crafted ?Many of those actually had many CPUs...exemple : TurboR is like a 16bit with a Z80 for retro-compatibility...Even the SEGA Megadrive has a Z80 (as a sound card... coupled with an AY psg) that could be used for retrocompatibility (SMS...)Thre C128 had 2 kind of CPU, yet couldn't properly get them working together...But a machine based on a set of two Z80...this would be a 2x8bit = 16bit... sort of.This could have worked well.Alway wondering what if the Amstrad Plus had actually 2xZ80 and 2 Asics (one for video, the other for the rest)...One of those Z80 would have been handicaped by the display (wait states and -16K...) as in a proper CPC but the other would not.Of course designing softwares could get triky... but. such a machine with 256K RAM and an upgraded set of video modes (32K based ones, 160x200x256, 320x200x16, 640x200x4... and overscan trick still availlable... )...could certainly rape an Atari ST IMO.
Quote from: MacDeath on 13:18, 27 December 10But a machine based on a set of two Z80...this would be a 2x8bit = 16bit... sort of.This could have worked well.
Quote from: phi2x on 14:22, 27 December 10True. It depens whether you look at the processor with a programmer's point of view (ie: the instruction set and the registers), an Electrical Engineer POV (ie: databus), or from a microprocessor designer's view (ie: the internal ALU).Motorola 68008 is a really puzzling thing. It has a 32-bit ALU, with a 32-bit instruction set, but has an 8-bit databus, and 24-bit adressing. So good luck classifying that beast From what I understand, eZ80 really handles 24-bit datas. Wikipedia says that most registers (HL, BC, DE, IX, IY, SP, and PC) are extended from 16 to 24 bits.
QuoteWere 8 bit "duocore" ever crafted ?
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