Timeline for Fastest non-emulated CP/M Z80-based computer ever built?
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 2, 2019 at 3:02 | comment | added | cjs | The MakerLisp Machine mentioned in another comment uses the eZ80 and the recent v1.3 software release (2019-08-31) now includes CP/M 2.2. | |
| Sep 2, 2019 at 3:02 | comment | added | cjs | @Jules This appears to be incorrect. According to the eZ80 CPU User Manual, "For backward compatibility with legacy Z80 programs, the CPU operates in Z80 MEMORY mode with 16-bit addresses and 16-bit CPU registers." (p.6) It goes on to say that "In ADL [the alternate "address and data long"] mode, the user application can take advantage of the CPU’s 16 MB linear addressing space, 24-bit CPU registers, and enhanced instruction set" (p.7), implying that the enhanced instructions are not available in Z80 mode. | |
| Jun 17, 2018 at 13:00 | comment | added | Jules | Having just been reading about the eZ80, I have to disagree with the assertion that it is "Z80 compatible". Some Z80 software may run on it, but as it has repurposed existing (albeit not especially useful) instructions into mode switches to allow for 24-bit addressing, and apparently doesn't include a mode that prevents this behaviour, I don't consider it fully compatible, even if it is compatible with some software (including CP/M). | |
| Nov 24, 2017 at 23:08 | comment | added | RonJohn | The eZ80 matches all the criteria in the question ("Z80 compatible", "ran CP/M", "using mostly the Z80 ISA"). | |
| Nov 24, 2017 at 14:30 | comment | added | pipe | @RichF The problem is not with the answer, it's with the question. | |
| Nov 24, 2017 at 13:35 | comment | added | user | What constitutes “retro”? seems applicable. | |
| Nov 24, 2017 at 13:11 | comment | added | Raffzahn | @RichF The eZ80 did, AFAIR, apear in 1998, so it does take the 2000ish hurdle :) Also, I learned that seting a (more or less) fixed date is the best way to make a definition we need irrelevant. Wait 10 more years, and we get peope with a sensible belive that x86-64 is retro. In my book this question is not even borderline, but fully on topic as it's about hecontiuation. But I'm as well aware, that modern implementations open a mine field of what's still considered bearing the classic spirit or not. | |
| Nov 24, 2017 at 12:07 | comment | added | Radovan Garabík | @RichF OTOH, CP/M is definitely retro enough, and I'd say questions about running retro OS'es on modern hardware should be on-topic. | |
| Nov 24, 2017 at 12:04 | comment | added | RichF | I have mixed feelings for this answer. On the one hand, the question was "fastest ever built?". OTOH, this is the **Retrocomputing SE -- doesn't that sort of automatically limit technology to the 20th century and before? From what I can tell in a quick search, the eZ80 began in the mid-2000s. I'm not downvoting, though, because I did learn something. | |
| Nov 24, 2017 at 11:40 | comment | added | Raffzahn | <nitpickingmode> I wouldn't call an eZ80 a real Z80. It's a Z80 compatible CPU. </nitpickingmode> | |
| Nov 24, 2017 at 10:09 | history | answered | Radovan Garabík | CC BY-SA 3.0 |