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I see the "Secondary" tabs but what I don't see is the center-tap tab. Maybe I need another coffee ...

That's exactly what I did several years ago with my NYOZ system. There's a master board with most of the I/O attached and up to 16 Z8S18033 processors (1-4 per slave board) and 512KB RAM each for a total of 16*33=528 MHz of Z180 power. Each slave has a unique 4KB dual-port memory to the master...

I'm thinking that the unshielded 187F12 would work for lower output VA but it might introduce EMI to nearby circuits or equipment. If you don't need the 15A of +8V, you might want to also look at the 167Q12 (6A), 167R12 (8A) or 167S12 (10A) which are all shielded. By lowering the output VA...

You can also build a +8V at 15A with +/-16V at 3A each power supply using a single transformer per the attached circuit. I used this design without issues for many years in my S100 system back in the day. Unfortunately the components are now really expensive if bought new. As to enclosure...

You definitely appear to be dealing with a quirk of RunCPM's CCP and I've never seen such behavior in CP/M-2.2. Repeating your tests on a real CP/M-2.2 system: Entering "012345" as a command for 012345.COM works fine whereas entering "012345.COM" fails. Entering "012345.co" fails as a command...

That is *NOT* what I said or implied! The LAN port on these systems is a functional 10/100 Mbps Ethernet connection based on the eZ80F91's internal Ethernet Media Access Controller (EMAC) connected to a Microchip transceiver via RMII with a Pulse combined magnetics and RJ45 connector. Every...

The vast majority of users seem to be using these systems as a VERY fast CP/M system with an enhanced Z80 instruction set. All the Ethernet components are installed but since I was in the middle of a downsizing move, I didn't have the time to investigate that anomoly. At less than 1/2 price I...

As the original designer and builder of this system, please note that although this particular system (S/N #37) has the Ethernet connector and circuitry, it did *NOT* function properly during Ethernet testing when it was originally built/sold and this was disclosed to the original purchaser...

My BIOS code on various machines only keeps a single copy of the last track and sector values from the BDOS calls and I've never had a problem when using multiple different disks.

I know we've had this discussion before but some VCF members may not have seen it. Quite awhile ago I was doing some BIOS updates so I thought I'd do some benchmarks on different Sector-Per-Track (SPT) settings in CP/M 2.2. This was done on a 33MHz Z180 and consisted of a SUB file with 100...

I have several eZ80 and Z180 CP/M systems and kits on Tindie at www.tindie.com/stores/circlem/ FYI: I've seen various advertising such as "Agon light™ is the fastest and cheapest 8-bit microcomputer ever made." and "AgonLight2 the fastest Z80 retro computer development is remarkable". That's...

Re D-sub pin crimper: I had one similar to the one you linked to on Amazon and quickly gave it away since I didn't feel that it gave consistent and reliable crimps. Since it was primarily for aircraft avionics, I finally broke down and got a used 8-point military approved crimper, namely the...

The ChibiAkumas page appears to be oriented to the TI-84 and/or some emulator. Personally I much prefer to just use the manufacturer's manuals for reference material ... if those documents contain an error then they usually publish an update or an errata. I've made a few comments about Dean's...

Those I/O ports are not defined on an eZ80190 or eZ80F92/L92/F93 but I've never seen a reference to a Z180-like MMU. Perhaps someone might have implemented a hardware MMU outboard of those processors. To the best of my knowledge, the only way to get 32K "banks" with an eZ80 in Z80 mode without...

For me, there's some missing data as to what may be the best approach. For example: - What are the UART frequencies and the Z80 frequency? - How deep are the UART and possibly USB FIFO's? - How much processing of received data is required? The loop approach of testing for Rx activity works if...

This got me curious to see how the eZ80F91 at 50 MHz on my Min-Ez system using BBC BASIC 3.00 under CP/M 2.2 would compare to the AgonLite 2. The accuracy is the same and the random-ness is all over the map from ~2.09 to ~23.77. Since I don't have internal BBC BASIC timing routines, the...

IcedMuons: Welcome aboard. cjs: At least I lived and worked in Edmonton for 11 years before seeing the light and coming back to Calgary :-) That took a detour via a stint in Toronto and now to a more relaxed lifestyle in Okotoks. However, I'll give Edmonton ONE credit ... it has a hockey...

Although this thread has gotten off topic, I'll add my $0.02 on topic before responding to previous comments. I've written a fair amount of Z80 and derivatives software in assembler. In order to make it available and useful for others, I choose to simply use very commonly available and...

Some of the factors related to new versus used chips should be based on the experience of the builder, the availability of testing tools and the complexity of the devices. Used parts may be cheaper but some issues can take a lot of time and work to determine whether it's a device failure versus...

As the developer of the MinZ series (MinZ, MinZ-C, Min-eZ & eZ-Tiny), I originally chose to let this thread play out with comments from others. While it will be good for the community if an Agon Heavy is released, I'll make a few points: 1) I choose to not include VGA/KBD in my designs since...