On Tuesday, September 13, 2016 at 3:45:30 AM UTC+3, Randy McLaughlin wrote:
> There is a sight with CP/M 2.2 running that just needs an SD socket added. The original site is down but here is an archive:
>
> http://www.z80cpu.eu/mirrors/www.vegeneering.com/eZ80_CPM/index.html
>
>
> Randy

Hi Randy.

I'm replying on a message from you that was written on Sept 2016, but I'm just trying if I can get in contact with you about eZ80 SBC (CP/M) systems.

Are you still reading this group?

Cheers

Robbert, the dutch guy living in Istanbul

I am still here but I never even built the system.

Somewhere I have a couple F91's but never got around to do that much with them.

Howard Harte was going to use them on the failed Imsai Two project. Howard got CP/M 3 running but he designed a motherboard to do it, his site showing it is now down:

https://comp.os.cpm.narkive.com/MFHlP2Xh/ez80-based-single-board-computer-runs-cp-m-3-0

Randy

On Wednesday, March 9, 2022 at 12:57:07 PM UTC-6, rescu...@gmail.com wrote:
> On Tuesday, September 13, 2016 at 3:45:30 AM UTC+3, Randy McLaughlin wrote:
> > There is a sight with CP/M 2.2 running that just needs an SD socket added. The original site is down but here is an archive:
> >
> > http://www.z80cpu.eu/mirrors/www.vegeneering.com/eZ80_CPM/index.html
> >
> >
> > Randy
> Hi Randy.
>
> I'm replying on a message from you that was written on Sept 2016, but I'm just trying if I can get in contact with you about eZ80 SBC (CP/M) systems.
>
> Are you still reading this group?
>
> Cheers
>
> Robbert, the dutch guy living in Istanbul

I've got a few too many things on my plate to get involved with the EZ80SBC project. However, I have built a few eZ80 projects with CP/M 2.2 (a 50 MHz eZ80F91 and an 18.432 MHz eZ80F92/3) that are available on Tindie at https://www.tindie.com/stores/circlem/

One of the biggest issues with a 50 MHz eZ80 is availablility of parts: the 50 MHz eZ80L92 is available but requires external RAM (no common area) and Flash while the eZ80F91AZA has had it's delivery dates constantly pushed back. My order scheduled for June last year is now scheduled for December of this year while an order from a different supplier is now scheduled for May, about a year late.

If you really want a fast CP/M system a better way to go is FPGA I would recommend the multicomp designs.

The EZ80 is great but past.

Randy

On Wednesday, March 9, 2022 at 3:16:21 PM UTC-6, Bill McMullen wrote:
> I've got a few too many things on my plate to get involved with the EZ80SBC project. However, I have built a few eZ80 projects with CP/M 2.2 (a 50 MHz eZ80F91 and an 18.432 MHz eZ80F92/3) that are available on Tindie at https://www.tindie.com/stores/circlem/
>
> One of the biggest issues with a 50 MHz eZ80 is availablility of parts: the 50 MHz eZ80L92 is available but requires external RAM (no common area) and Flash while the eZ80F91AZA has had it's delivery dates constantly pushed back. My order scheduled for June last year is now scheduled for December of this year while an order from a different supplier is now scheduled for May, about a year late.

On Wednesday, 9 March 2022 at 20:42:24 UTC-7, Randy McLaughlin wrote:
> If you really want a fast CP/M system a better way to go is FPGA I would recommend the multicomp designs.
>
> The EZ80 is great but past.

The eZ80 from 2001 may be "past" in some people's opinion, but this thread is also about CP/M (1974) which predates the eZ80 by about 27 years. Forty-six years after the Z80 introduction it's still an orderable part from Zilog distributors. Many hobbyists prefer real Zilog hardware as do companies with legacy products who have no desire to go through the arduous process of FPGA development and quality control validation plus long-term availability issues.

The eZ80 is pipelined and has reduced the T states for most of the Z80 instructions (i.e. 1 vs 4 T states for LD R,R'). My eZ80 benchmarking may be somewhat limited but my various tests put a 50 MHz eZ80 as the equivalent of a Z80 at about 170-195 MHz.

What is the Z80 equivalent frequency of your FPGA implementations? The S100 Z80 FPGA SBC appears to be a 50 MHz Z80 (possibly about 1/4 the speed of an eZ80) and uses an FPGA board that's fifteen times the cost.

On Thursday, March 10, 2022 at 7:14:07 PM UTC+1, Bill McMullen wrote:
> On Wednesday, 9 March 2022 at 20:42:24 UTC-7, Randy McLaughlin wrote:
> > If you really want a fast CP/M system a better way to go is FPGA I would recommend the multicomp designs.
> >
> > The EZ80 is great but past.
> The eZ80 from 2001 may be "past" in some people's opinion, but this thread is also about CP/M (1974) which predates the eZ80 by about 27 years. Forty-six years after the Z80 introduction it's still an orderable part from Zilog distributors. Many hobbyists prefer real Zilog hardware as do companies with legacy products who have no desire to go through the arduous process of FPGA development and quality control validation plus long-term availability issues.
>
> The eZ80 is pipelined and has reduced the T states for most of the Z80 instructions (i.e. 1 vs 4 T states for LD R,R'). My eZ80 benchmarking may be somewhat limited but my various tests put a 50 MHz eZ80 as the equivalent of a Z80 at about 170-195 MHz.
>
> What is the Z80 equivalent frequency of your FPGA implementations? The S100 Z80 FPGA SBC appears to be a 50 MHz Z80 (possibly about 1/4 the speed of an eZ80) and uses an FPGA board that's fifteen times the cost.

Hi!

I just stumbled upon this post when I was seeking for some eZ80 info and may be you will be interested in something I'm creating. Is a SBC using an eZ80190F, with 512Kb of FLASH, 2Mb of 10ns RAM for zero wait states, 2 bus expansions, 6 device ports (a multiplexed SPI port up to 25Mhz with extra signals for INT, RDY and RST) and a debug serial port.

https://twitter.com/gusmanb/status/1517286665974394880

I've been working on this for two years on my spare time and I'm nearly finished with the base system, I already have a bootloader, the device kernel, a library for STM32 CPU's to create devices and so on, I will publish it as open source very soon on my Github so if you're interested follow me: https://github.com/gusmanb

Also I'm preparing a VGA card using a raspberry pico and storage/IO devices using STM32 boards.

Cheers!