Path: Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Tue, 23 Apr 2024 21:40:35 +0000 From: boB Newsgroups: sci.electronics.design Subject: Re: Zilog stopping Z80 production Date: Tue, 23 Apr 2024 14:40:34 -0700 Message-ID: References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 42 X-Trace: sv3-1J6CivOt7oaNtlH2QF/ofDf+n88OGYE9chgZS+G3NksLJgJo7UQfsdb4nmLIoEw2tV2Z5NU8IEqP3/U!IkVCtWln7v3PvHk/7EM3ta60Hkah6+jpOx8tUZ2aqmdQ9vpbLcIozG98QGqia0DJW5ldBPL1QrYw!Zl3JeSs= X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2743 On Tue, 23 Apr 2024 13:40:13 -0700, Don Y wrote: >On 4/23/2024 6:09 AM, Peter Heitzer wrote: >> The most difficult part is to put all into a 40 pin 300 mil package as >> a drop in replacement. > >The most common Zx80's were 600mil. > >> If all I wanted was a machinery to run Z80 software >> my choice wuild be a RP2040 board. >> https://github.com/djbottrill/rp2040_z80_emulator > >You can likely emulate a Zx80's *software* faster than even the >fastest devices, nowadays. But, for legacy software, you would >have problems supporting the I/Os -- even if you virtualized them. > >One amusing anecdote re: MAME's nominal emulation of older games >is how they can't[1] ensure the same timing relationships that were >guaranteed in the original hardware. Getting the functionality >correct but the timing "off" can have visual consequences. > >Part of that is a consequence of trying to get more performance >out of the hardware than was nominally available. And, part was >a lack of concern for "portability" (of which emulation is >probably the epitome). > >[1] You could, of course, do so -- by dramatically increasing the >complexity of the emulator! > > I miss playing with my old home built S-100 CP/M computer around 1980. Those were really the fun days of computing and digital logic circuits. The other day after hearing the demise of the Z80, I ordered 2 of the 20 MHz Z80 40 pin devices. I did not even know there was a 20 MHz version. Not sure what I will ever do with them but who knows ? Maybe I'll just look at them. boB