Circa 1985 ish, I used to buy 8201A's by the five unit case. Still have ~ two dozen of the 8201A's ...and STILL use them for data collectors via soft-ware / programs I wrote and simple CMOS interface . I wrote programs, in basic, to transfer data back and forth between the PC and the NEC. Still use that VERY old ~64k BASICA.exe in a Windows shell on a linux operating system... More recently I will monitor ebay any pick-up a 8201A ...if the price is 'right'.
I have 'all' the circuit manuals, but generally just test, for example, a good screen - keyboard - etc. for the bad one to attempt to isolate the bad component or problem. These are rugged units. I don't remember one failing in the field where they were housed in a simple aluminum box in freezing cold or summer heat. ...arguably after working with both the RS cousin and the Kyocera (spelling?) I found the 8201A more fitting for my needs. I still have both of the cousins. I have two or three never used NEC 8300, which followed the 8201A, (...but TOTALLY redesigned ) in their pristine original 'handled' boxes and the original five unit shipping case. All with matching serial numbers. Likely, a couple of very few virgin machines in the world. Hope you can make your 8201A's operational. They were AND still are good little machines... Regards, Richard Oaks ===================== ________________________________ From: M100 <[email protected]> on behalf of [email protected] <[email protected]> Sent: Saturday, May 25, 2019 16:40 To: [email protected] Subject: M100 Digest, Vol 101, Issue 13 Send M100 mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.bitchin100.com/listinfo.cgi/m100-bitchin100.com or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of M100 digest..." Today's Topics: 1. Dead NEC Units (Kurt McCullum) 2. smoke on the water.... (Ed Graffius) 3. Re: Dead NEC Units (Stephen Adolph) 4. Re: Dead NEC Units (Josh Malone) ---------------------------------------------------------------------- Message: 1 Date: Fri, 24 May 2019 17:22:56 -0700 From: "Kurt McCullum" <[email protected]> To: [email protected] Subject: [M100] Dead NEC Units Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" I've got two NEC 8201s that are both dead. I'd like to get them up and running again. Especially the one with the Japanese keyboard. Has anyone put together a list of what to check to diagnose where the problem might be. I have done the power supply test from the service manual and the CPU seems to be correct but I'm not sure where to start. Both units turn on with a blank screen. Kurt -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20190524/6a14f46c/attachment-0001.html> ------------------------------ Message: 2 Date: Sat, 25 May 2019 04:32:43 +0000 (UTC) From: Ed Graffius <[email protected]> To: [email protected] Subject: [M100] smoke on the water.... Message-ID: <[email protected]> Content-Type: text/plain; charset="utf-8" no I didnt blow it up in the bathroom tub.? I programmed it to play smoke on the water.?? didja know the docs about the sound function are wrong?? the tone gets higher as the number gets LOWER, not the other way as the docs state -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20190525/74647425/attachment-0001.html> ------------------------------ Message: 3 Date: Sat, 25 May 2019 08:22:39 -0400 From: Stephen Adolph <[email protected]> To: [email protected] Subject: Re: [M100] Dead NEC Units Message-ID: <CAMCMnV6RHe2Lw_DXC-d-_e=jRjY9Gp=obg3fxivyp3waxew...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Kurt, do you have a scope? I would certainly try reseating any socketed parts. Main rom is socketed for sure. Then I would start at the clock and work forwards. * verify the CPU has clock * verify the CPU control lines are toggling * look at the address and data lines for toggling and level if that all looks ok then, pin by pin on the main rom, check for toggle and level. again for the ram modules. to make it easy remove as many ram modules as you can. check DC on the power supplies of course. On Fri, May 24, 2019 at 8:41 PM Kurt McCullum <[email protected]> wrote: > I've got two NEC 8201s that are both dead. I'd like to get them up and > running again. Especially the one with the Japanese keyboard. Has anyone > put together a list of what to check to diagnose where the problem might > be. I have done the power supply test from the service manual and the CPU > seems to be correct but I'm not sure where to start. Both units turn on > with a blank screen. > > Kurt > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20190525/c233efff/attachment-0001.html> ------------------------------ Message: 4 Date: Sat, 25 May 2019 09:37:18 -0400 From: Josh Malone <[email protected]> To: [email protected] Subject: Re: [M100] Dead NEC Units Message-ID: <CAB==womgofo0mw01-nbykjptjyjgjbygvzfusqlxbjtdsch...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Does the no-screen BASIC test work? (Cold-start, enter, B E E P, enter) On Sat, May 25, 2019, 8:22 AM Stephen Adolph <[email protected]> wrote: > Kurt, do you have a scope? > I would certainly try reseating any socketed parts. Main rom is socketed > for sure. > Then I would start at the clock and work forwards. > * verify the CPU has clock > * verify the CPU control lines are toggling > * look at the address and data lines for toggling and level > > if that all looks ok then, pin by pin on the main rom, check for toggle > and level. > again for the ram modules. > to make it easy remove as many ram modules as you can. > > check DC on the power supplies of course. > > On Fri, May 24, 2019 at 8:41 PM Kurt McCullum <[email protected]> wrote: > >> I've got two NEC 8201s that are both dead. I'd like to get them up and >> running again. Especially the one with the Japanese keyboard. Has anyone >> put together a list of what to check to diagnose where the problem might >> be. I have done the power supply test from the service manual and the CPU >> seems to be correct but I'm not sure where to start. Both units turn on >> with a blank screen. >> >> Kurt >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20190525/ba328b17/attachment-0001.html> ------------------------------ Subject: Digest Footer _______________________________________________ M100 mailing list [email protected] http://lists.bitchin100.com/listinfo.cgi/m100-bitchin100.com ------------------------------ End of M100 Digest, Vol 101, Issue 13 *************************************
