Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id aBznIB1Mv2hE1AUAcizydQ (envelope-from ) for ; Mon, 08 Sep 2025 16:35:25 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Mon, 08 Sep 2025 16:35:25 -0500 Received: from mail-ed1-f45.google.com ([209.85.208.45]:55613) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.1) (envelope-from ) id 1uvjWG-00000001ayh-3IEh for craig@sbc-85.com; Mon, 08 Sep 2025 16:35:25 -0500 Received: by mail-ed1-f45.google.com with SMTP id 4fb4d7f45d1cf-6228de280ccso5399509a12.3 for ; Mon, 08 Sep 2025 14:35:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757367313; x=1757972113; darn=sbc-85.com; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :from:to:cc:subject:date:message-id:reply-to; bh=7njzDIwP/HOSiifytCYjMIb7AijarcrzBawD9AM3Dbg=; b=Y/S/GUaMYKjiPzjIlrSHcVYT8D02h0SqLC+fNMFiJLbd1L6/bOca8IyiXflfXrY8qb 8o1dmBnsWstzx8w3gdflqrfsT2MJAdZabNpi0DY7k+1hPjn8m9PQlM+UJ9Ls0kZzxVrU Me8rfvMWbZiZ91Jb2/MPotgTis7Sxdv9UZjUm/XWkLXRdv6c/FhgfXIgHUAlQvjzPj30 PIZrw8wKo/T6XK5JSMSxUcZu/5gXpGsPevliPJIrZVbNeqQ61oxdN6aRLsdKZdigkjwx Nho05JyFxeG9djPi+RlmD0FovkxCEaY9oB0xIBTuE3GyCt5wE0JnVw2Bn0v/012e7A35 3YRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757367313; x=1757972113; h=to:subject:message-id:date:from:in-reply-to:references:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=7njzDIwP/HOSiifytCYjMIb7AijarcrzBawD9AM3Dbg=; b=KnvFOKZ+qwcNxCEhLvTzzgyFsHITOS8qVVhTj25ZTQVNxBeO6sWN5aMD5tcitTNu72 q5j+GSQkLGzIKFblwI5evN4qHpdigmWgtGivbXQa8y5FrBCCgJYAWQK+q3x9Wgl66Jan VYawN64OYf98cXzFextxyEzKIgAf35a9qE0bwgY9taDIptKGDG1mqqOH4U2N6jfThLb9 +f1Lc8qmJMACm0RSePqk7aZya8+g/RzXQDnYQjYiYauxZwyde8Oe2uz4uq1d+fMDngpZ BNqFQs5h3+M69+4Ykveg/bczzHG53z1UK6LyXlT0d1NqLV+UMgSShUZQV0cNMCWkjqUT +qfQ== X-Gm-Message-State: AOJu0Yx8dYnphb6RWt/IBE4rLzZ9RGfiUbHpiScU9rOR9N1HT16HSJGF zqtMXwQIxKI70Gp/bdIXy4e/U1PG9TygfF4Ab7O+xOX8uw/Gmsa6SkK5pqcbJ4Wt5Pdpzp5+lIK KfBZuaHkDh9iUIG0px8GgDrLA4ShkOX86aQ== X-Gm-Gg: ASbGncuaU3PTNTZrkWKypGcNNKZPrg4YojjRjWvbfHN600XoADT/A6UkARlpx1617Co tZyNOtBD4pt0MvF/+gDy6nVc1PVuYqz6b7OIdWu3gTYr99QrtCWMPexWCzCAxAwyUqBABGsRIKN /xy1AdAZCIZApimsQqhc2hf0utSK63kODQ53Ci6pf2GtCPybd8lInBCLMaxysCyLVXYl9XvQE2J LwWFdfVdqq5c/rsiw== X-Google-Smtp-Source: AGHT+IF9dQYkU8EFjm6RexrxMYMCB9N6zUoMhePxczr9AzUuJf95vdDMkKjDvtHUX9HB+h7qdPp2uQfVPEhpV5aMYkA= X-Received: by 2002:a05:6402:354a:b0:62a:91d5:8854 with SMTP id 4fb4d7f45d1cf-62a91e4d02emr2449349a12.36.1757367312513; Mon, 08 Sep 2025 14:35:12 -0700 (PDT) MIME-Version: 1.0 References: <0345A09E-A153-4977-BEE9-0A2053367102@sbc-85.com> In-Reply-To: <0345A09E-A153-4977-BEE9-0A2053367102@sbc-85.com> From: Ray Potcinske Date: Mon, 8 Sep 2025 16:34:59 -0500 X-Gm-Features: AS18NWB8kLWQh_9Ctsh6M3mDJpyxReEQ41lFVY6F8PoG-g5EBHw8YUO6D4NIxbU Message-ID: Subject: Re: Digi-Key Nibbler Boards To: SBC-85 Content-Type: multipart/alternative; boundary="00000000000066fe1f063e50f64c" X-Spam-Status: No, score=-3.9 X-Spam-Score: -38 X-Spam-Bar: --- X-Spam-Flag: NO --00000000000066fe1f063e50f64c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable There is signal all over the place. When I do a reset (RESET_N1 low) nothing changes. You would think I would see some start-up sequence of events somewhere. All pulses & waveforms are the same all the time. I think the CPU is not crunching.... On Mon, Sep 8, 2025 at 1:07=E2=80=AFPM SBC-85 wrote: > You have the jp1 and 2 patched as in the photo on the schematic? > Oh, clock is dead-on. I read that as dead. On 4MHz. Are you seeing read > strobes from the cpu and enable strobes both tested at the eprom? > > The standard 74155 should be ok, but it is worth looking at further, I > need to look at the schematic again and check > > NIBL pretty much requires everything to work before anything will work. = I > think some RAMless test code is needed. > > > > On Sep 8, 2025, at 10:39=E2=80=AFAM, Ray Potcinske = wrote: > > =EF=BB=BF > I meant the clock is working properly Right on the money at 4Mhz > > I used wire jumpers instead of wire-wrap. > > Don't know if it makes a difference but I only had 74155 and not the LS > flavor. > > > On Mon, Sep 8, 2025 at 12:30=E2=80=AFPM SBC-85 wrote: > >> You need to wire wrap the jp1 and 2 since I messed up the TxD and RxD. >> But it isn=E2=80=99t going to get very far without a working clock signa= l. Yes, >> NIBL uses sense and flag >> >> On Sep 8, 2025, at 10:14=E2=80=AFAM, Ray Potcinske = wrote: >> >> =EF=BB=BF >> Notes: >> JP1 & JP2 jumpers off in pic. I have tried various configs incl direct >> serial lines to the JP pins. >> I have various test equipment. >> Clock is dead-on 4Mhz. >> In your vid you are not using SIN & SOUT but instead Sense & Flag, right= ? >> >> On Mon, Sep 8, 2025 at 10:58=E2=80=AFAM SBC-85 wrote: >> >>> Send me pictures of the board front and back and jumpers and I will see >>> if I can spot anything >>> >>> On Sep 8, 2025, at 8:24=E2=80=AFAM, SBC-85 wrote: >>> >>> =EF=BB=BF >>> Hi Ray >>> >>> You are using the serial header and usb adapter? You have the hampering >>> correct? Do you have a scope or logic probe? Correct frequency at clock >>> signal? Does it output the heartbeat if sense b input is low on reset? >>> Deselect jumper installed to enable. address decoder? >>> >>> >>> >>> >>> On Sep 8, 2025, at 6:07=E2=80=AFAM, Ray Potcinske = wrote: >>> >>> =EF=BB=BF >>> Hi again Craig, >>> >>> No joy on getting my Nibbler working. Bus address and data seem to be >>> alive but no serial, flag or sense activity. I am suspecting the CPU it= self >>> as it is a pull from an old S100 board that looks pretty rough. I'm >>> ordering more INS8060s but they won't arrive for a while. Might you by >>> chance have one you could sell me? I could give you another back when t= hey >>> arrive. Otherwise, this is a great project and I thank you for doing th= is. >>> It brings back a little history that was in a better time for technolog= y. >>> >>> Ray >>> >>> On Sat, Sep 6, 2025 at 6:34=E2=80=AFPM wrote: >>> >>>> Hi Ray, >>>> >>>> >>>> >>>> I think the rom order is noted in the schematic. The one towards the >>>> edge is lower. The later ROM has the PUTC bit 7 bug fixed >>>> >>>> >>>> >>>> Regards >>>> >>>> craig >>>> >>>> >>>> >>>> *From:* Ray Potcinske >>>> *Sent:* Saturday, September 6, 2025 3:37 PM >>>> *To:* craig@sbc-85.com >>>> *Subject:* Re: Digi-Key Nibbler Boards >>>> >>>> >>>> >>>> Hey Craig! >>>> >>>> >>>> >>>> I got the board built but not yet running. I found your R1 & R2 fix an= d >>>> applied it. I also only had on-hand 81LS95's not 97's but noticed that= the >>>> original board used them and saw that the G1 & G2 are tied together an= yway, >>>> so I figured they will work. One question I have is re the 2 2716's. W= hich >>>> is the high order? U10 or U11? Also, I burned the EPROMs and noticed= the >>>> there are 2 releases for the high order - will either work? >>>> >>>> >>>> >>>> Anyway, if you have any tips to get this running please let me know. >>>> >>>> >>>> >>>> Thanks again, Ray >>>> >>>> >>>> >>>> On Thu, Sep 4, 2025 at 8:10=E2=80=AFPM wrote: >>>> >>>> Hi Ray, thanks for the update. Make sure you have downloaded the >>>> latest schematic on the project page, if we find any errors on the boa= rd >>>> they will be updated there. also the latest ROMs are there. >>>> >>>> >>>> >>>> I will keep your items in mind, maybe the ohio scientific. I think >>>> they were very good value for money. >>>> >>>> >>>> >>>> Regards >>>> >>>> craig >>>> >>>> >>>> >>>> *From:* Ray Potcinske >>>> *Sent:* Thursday, September 4, 2025 4:09 PM >>>> *To:* craig@sbc-85.com >>>> *Subject:* Re: Digi-Key Nibbler Boards >>>> >>>> >>>> >>>> Craig, >>>> >>>> I finally got the PCB yesterday. Our local USPS is really bad. I am >>>> anxious to get it running. For future reference, I got a lot of old >>>> computer stuff if you are ever in need of some hard to find parts. I h= ave >>>> lots of COSMAC (CDP1802) and related stuff, some Ohio Scientific, Heat= hkit >>>> H8, etc. Not really actively trying to get rid of anything but just th= ought >>>> I'd let you know. >>>> >>>> Thanks, Ray >>>> >>>> >>>> >>>> On Thu, Aug 28, 2025 at 7:42=E2=80=AFPM wrote: >>>> >>>> Thanks Ray. I will get a biscotti with my coffee next time ! >>>> >>>> >>>> >>>> I have already walked it out to the mail box, here is your tracking >>>> number >>>> >>>> >>>> >>>> Tracking Number >>>> >>>> 9400150206217253252770 >>>> >>>> >>>> >>>> >>>> >>>> >>>> Regards >>>> >>>> >>>> >>>> craig >>>> >>>> >>>> >>>> *From:* Ray Potcinske >>>> *Sent:* Thursday, August 28, 2025 5:32 PM >>>> *To:* craig@sbc-85.com >>>> *Subject:* Re: Digi-Key Nibbler Boards >>>> >>>> >>>> >>>> I rounded it up. Thanks for your efforts >>>> >>>> >>>> >>>> On Thu, Aug 28, 2025 at 7:26=E2=80=AFPM Ray Potcinske >>>> wrote: >>>> >>>> Thanks, I will! >>>> >>>> >>>> >>>> On Thu, Aug 28, 2025 at 6:30=E2=80=AFPM wrote: >>>> >>>> Hi Ray, >>>> >>>> >>>> >>>> To >>>> >>>> >>>> RAY POTCINSKE >>>> >>>> 15775 RANCHETTE RD, TERRELL TX, 75161-5539, US >>>> >>>> >>>> >>>> Shipping of just the Nibbler board to you will be $6.50. If you decid= e >>>> to go forward with just the board, you can paypal me the shipping cost= to >>>> this address. >>>> >>>> Thanks >>>> >>>> craig >>>> >>>> >>>> >>>> *From:* SBC-85 >>>> *Sent:* Wednesday, August 27, 2025 8:16 PM >>>> *To:* Ray Potcinske >>>> *Subject:* Re: Digi-Key Nibbler Boards >>>> >>>> >>>> >>>> Hi Ray. NIBL uses two 2716 eproms. Usuallh )n the forums you can find >>>> someone locally to program eproms for you. Or you can can send me epro= ms >>>> and k will program or you can buy programmed eproms on my tindie site >>>> >>>> >>>> >>>> >>>> https://www.tindie.com/products/helloworld/programmed-eprom-pick-conte= nts/ >>>> >>>> >>>> >>>> If you get them on tindie, it will charge shipping for the eproms and = I >>>> can then just add the bare nibble board. They can all ship flat rate u= sps >>>> so no more than $11 I think. >>>> >>>> >>>> >>>> On Aug 27, 2025, at 4:08=E2=80=AFPM, Ray Potcinske wrote: >>>> >>>> =EF=BB=BF >>>> >>>> Thanks! Could I also get a EPROM with the NIBL Basic? >>>> >>>> >>>> >>>> On Wed, Aug 27, 2025 at 1:14=E2=80=AFPM wrote: >>>> >>>> Hi Ray, thanks for letting me know. You got the last board. Let me >>>> get a label for it and I will let you know how much it costs. >>>> >>>> >>>> >>>> Regards >>>> >>>> craig >>>> >>>> >>>> >>>> *From:* Ray Potcinske >>>> *Sent:* Wednesday, August 27, 2025 10:39 AM >>>> *To:* 052922@sbc-85.com >>>> *Subject:* Digi-Key Nibbler Boards >>>> >>>> >>>> >>>> Hello, >>>> >>>> I have been looking at your resurrection and it is great! I actually >>>> had an original Nibbler while in the Air Force in 1979. Sadly, I got r= id of >>>> it somewhere along the line. I would like to get a board, or board set= to >>>> re-create my own. I can pay in advance if you like (PayPal?) >>>> >>>> >>>> >>>> Ray Potcinske >>>> >>>> 15775 Ranchette Rd. >>>> >>>> Terrell, TX 75161 >>>> >>>> <20250908_120406.jpg> >> <20250908_120423.jpg> >> >> --00000000000066fe1f063e50f64c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
There is signal all over the place. When I do a reset (RES= ET_N1 low) nothing changes. You would think I would see some start-up seque= nce of events somewhere. All pulses & waveforms are the same all the ti= me. I think the CPU is not crunching....

On Mon, Sep 8= , 2025 at 1:07=E2=80=AFPM SBC-85 <cr= aig@sbc-85.com> wrote:
You= have the jp1 and 2 patched as in the photo on the schematic?
Oh, clock is dead-on. I read that as dead. On 4MHz.=C2=A0 Are you = seeing read strobes from the cpu and enable strobes both tested at the epro= m?

The standard 74155 shou= ld be ok, but it is worth looking at further, I need to look at the schemat= ic again and check

NIBL pr= etty much requires everything to work before anything will work.=C2=A0 I th= ink some RAMless test code is needed.



On Sep= 8, 2025, at 10:39=E2=80=AFAM, Ray Potcinske <potcinske@gmail.com> wrote:

=EF=BB=BF
I meant the clock is working properly Right on the money at 4Mhz=

I used wire jumpers instead of wire-wrap.
Don't know if it makes a difference but I only had 74155 an= d not the LS flavor.


On Mon, Sep 8, 2025 at 12:30=E2=80= =AFPM SBC-85 <crai= g@sbc-85.com> wrote:
You n= eed to wire wrap the jp1 and 2 since I messed up the TxD and RxD.=C2=A0 But= it isn=E2=80=99t going to get very far without a working clock signal.=C2= =A0 Yes, NIBL uses sense and flag=C2=A0

On Sep 8, 2025, at 10:14=E2=80=AFAM, Ray Potcinske <potcinske@gmail.com> wrote:

=EF=BB=BF
Notes:
JP1 & JP2 jumpers off in = pic. I have tried various configs incl direct serial lines to the JP pins.<= /div>
I have various test equipment.
Clock is dead-on 4Mhz.
In your vid you are not using SIN & SOUT=C2=A0but instead Sens= e & Flag, right?

On Mon, Sep 8, 2025 at 10:58=E2=80=AFAM SBC-85 &l= t;craig@sbc-85.com> wrote:
Send me pictures of = the board front and back and jumpers and I will see if I can spot anything= =C2=A0
=EF=BB=BF
Hi Ray

You are= using the serial header and usb adapter? You have the hampering correct? D= o you have a scope or logic probe? Correct frequency at clock signal? Does = it output the heartbeat if sense b input is low on reset?=C2=A0 Deselect ju= mper installed to enable. address decoder?

=



=
On Sep 8, 2025, at 6:07=E2=80=AFAM, Ray Potcinske= <potcinske@gma= il.com> wrote:

<= div dir=3D"ltr">=EF=BB=BF
Hi again Craig,

No joy on getting my Nibbler working. Bus address and data seem to be ali= ve but no serial, flag or sense activity. I am suspecting the CPU itself as= it is a pull from an old S100 board that looks pretty rough. I'm order= ing more INS8060s but they won't arrive for a while. Might you by chanc= e have one you could sell me? I could=C2=A0give you another back when they = arrive. Otherwise, this is a great project and I thank you for doing this. = It brings back a little history that was in a better time for technology.

Ray

On Sat, Sep 6, 2025 at 6:34=E2=80=AFPM <= ;craig@sbc-85.com= > wrote:

Hi Ray,

=C2=A0

I think the rom order is noted in the schematic.= =C2=A0 The one towards the edge is lower.=C2=A0 The later ROM has the PUTC = bit 7 bug fixed

=C2=A0

<= span style=3D"font-size:11pt">Regards

craig

=C2=A0

From= : = Ray Potcinske <= potcinske@gmail.com>
Sent: Saturday, September 6, 2025 3:= 37 PM
To: c= raig@sbc-85.com
Subject: Re: Digi-Key Nibbler Boards

=C2=A0

<= p class=3D"MsoNormal">Hey Craig!

=C2=A0

I got the boar= d built but not yet running. I found your R1 & R2 fix and applied it. I= also only had on-hand 81LS95's not 97's but noticed that the origi= nal board used them and saw that the G1 & G2 are tied together anyway, = so I figured they will work. One question I have is re the 2 2716's. Wh= ich is the high order? U10 or U11?=C2=A0 =C2=A0Also, I burned the EPROMs an= d noticed the there are 2 releases for the high order - will either work?

=C2=A0

<= /div>

Anyway, if you have any tips to get this r= unning please=C2=A0let me know.

=C2=A0

Thanks ag= ain,=C2=A0 =C2=A0Ray

=C2=A0

On Thu, Sep 4, 2025 = at 8:10=E2=80=AFPM <= craig@sbc-85.com&= gt; wrote:

Hi Ray, thanks for the u= pdate.=C2=A0 Make sure you have downloaded the latest schematic on the proj= ect page, if we find any errors on the board they will be updated there.=C2= =A0 also the latest ROMs are there.

=C2=A0

I will keep your items in = mind, maybe the ohio scientific.=C2=A0 I think they were very good value fo= r money.

=C2=A0

Regards

craig

=C2=A0

From:= Ray Potc= inske <potcinsk= e@gmail.com>
Sent: Thursday, September 4, 2025 4:09 PMTo: craig@sbc= -85.com
Subject: Re: Digi-Key Nibbler Boards=

=C2=A0

Craig,

I finall= y got the PCB yesterday. Our local USPS is really bad. I am anxious to get = it running. For future reference, I got a lot of old computer stuff if you = are ever in need of some hard to find parts. I have lots of COSMAC (CDP1802= ) and related stuff, some Ohio Scientific, Heathkit H8, etc. Not really act= ively trying to get rid of anything but just thought I'd=C2=A0let you k= now.

Thanks,=C2=A0 Ray

=C2=A0

=

On Thu, Aug 28, 2025 at 7:42=E2=80=AFPM <craig@sbc-85.com> wrote:<= /u>

Thanks Ray.=C2=A0 I will get a biscotti with my coffee = next time !

=C2=A0

I have already walked it out to the mail box, here= is your tracking number

=C2=A0

Tracking Number<= /p>

9400150206217253252770

=C2=A0

=C2=A0

Regards

=C2=A0

craig

=C2=A0

From: Ray Potcinske <potcinske@gmail.com> <= br>Sent: Thursday, August 28, 2025 5:32 PM
To: craig@sbc-85.com
Subje= ct: Re: Digi-Key Nibbler Boards

=C2=A0

I rounde= d it up. Thanks for your efforts

=C2=A0

On Thu, Aug 28= , 2025 at 7:26=E2=80=AF= PM Ray Potcinske <potcinske@gmail.com> wrote:

<= div>

Thanks, I will!=C2=A0

=C2=A0

On Thu, Aug 28, 2025 at 6:30= =E2=80=AFPM <craig@sbc-85.com> wrote:

Hi Ray,

=C2=A0

To


RAY POTCINSKE

15775 RANCHETTE RD, TERRELL=C2=A0TX,= =C2=A075161-5539, US

=C2=A0

Shipping of just the Nibbler board to you= will be $6.50.=C2=A0 If you decide to go forward with just the board, you = can paypal me the shipping cost to this address.

Thanks=

craig<= u>

=C2= =A0

From: SBC-85 <craig@sbc-85.com>
Sent: Wednesday, Augus= t 27, 2025 8:16 PM
To: Ray Potcinske <potcinske@gmail.com>
Subject:= Re: Digi-Key Nibbler Boards

=C2=A0

Hi Ray= .=C2=A0 NIBL uses two 2716 eproms. Usuallh )n the forums you can find someo= ne locally to program eproms for you. Or you can can send me eproms and k w= ill program or you can buy programmed eproms on my tindie site

=C2=A0

<= p class=3D"MsoNormal">https://www.tindie.com/= products/helloworld/programmed-eprom-pick-contents/

=C2=A0

If you get them on tindie, it will charge shipping for the e= proms and I can then just add the bare nibble board. They can all ship flat= rate usps so no more than $11 I think.=C2=A0

<= p class=3D"MsoNormal" style=3D"margin-bottom:12pt">=C2=A0

=

On Aug 27, 2025, at 4:08=E2=80=AFPM, Ray Potcinske <potcinske@gmail.com> w= rote:

=EF=BB=BF

Thanks!=C2=A0 Could I also get a EPROM with the NIBL Basic?<= u>

=C2=A0

On Wed, Aug 27, 2025 at 1:14=E2=80=AFPM <craig@sbc-85.com> wrote:

Hi Ray,=C2=A0 thanks for letting me know. You got the last board.= =C2=A0 Let me get a label for it and I will let you know how much it costs.=

=C2=A0

Regards

craig

=C2=A0

From: Ray Potcinske &l= t;potcinske@gmail.= com>
Sent: Wednesday, August 27, 2025 10:39 AM
To:<= /b> 052922@sbc-85.co= m
Subject: Digi-Key Nibbler Boards

=C2=A0

Hello,

I have been looking= at your resurrection and it is great!=C2=A0 I actually had an original Nib= bler while in the Air Force in 1979. Sadly, I got rid of it somewhere along= the line. I would like to get a board, or board set to re-create=C2=A0my o= wn. I can pay in advance if you like (PayPal?)

=

=C2=A0

Ray Potcinske

1577= 5 Ranchette Rd.

Terrell,= TX=C2=A0 75161

=
<20250908_120406.jpg>
<20250908_120423.jpg>
--00000000000066fe1f063e50f64c--