Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id bHLDF5TtwWj7VwAAcizydQ (envelope-from ) for ; Wed, 10 Sep 2025 16:28:52 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Wed, 10 Sep 2025 16:28:52 -0500 Received: from mail-ed1-f49.google.com ([209.85.208.49]:44512) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.1) (envelope-from ) id 1uwSN1-000000005mR-2X5f for craig@sbc-85.com; Wed, 10 Sep 2025 16:28:52 -0500 Received: by mail-ed1-f49.google.com with SMTP id 4fb4d7f45d1cf-623720201fdso37040a12.1 for ; Wed, 10 Sep 2025 14:28:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757539720; x=1758144520; 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=yag/Akd/UJ3DC//Hljjrbt6NtT5aPdAkRO7eME7sJFk=; b=UB1SwkCRAOAcvsptdvixucttdpBeQSNLYQzbgKNqFX3IKfSLB9XI0HOKdXTeTgK8zu rOvMHpr8Zghrt6Hh1Hf2G/60P0Xq65Kp0nKok6x9rxdPQ2yWXFA76bEvYxW2WVxRGnzW /hzAjkmRUjDHs/IkRWaR20R6eOK41t0e1t9pPhgNU4qwk4MFi9XzEWENMQSeb14IU5Sn bT6oZiv7SZ9toISzRBkgNbm1jE/Gedneq1O5A63DSFAdXQoKHMOp0LaxAcLjmHhDE7wV wPclzM/NpjxnCgDzEq/mmN34JtbQlXSiKbuYgsVe2Ub1hWwHD5kgdyA6L9agPUgypiU+ Ff2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757539720; x=1758144520; 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=yag/Akd/UJ3DC//Hljjrbt6NtT5aPdAkRO7eME7sJFk=; b=kTSizTMP8x7eF/qiKTeEnXiIGjC9hvq7pKnlVMUSVxwwSMvB//iuLRdDm8kKEJSlLp ddc2UQE/qkIb5ISj8+HOABtNBsOqxB7btIztRnmwgs1x+12P4N9uimIbiSb/p/vJkb6M s60jOu23g9cMslf/+WVw9V5SoA1JP9GLuzErBV33f2NmcjxYnuZtx9KopuwD1ciBmbg1 wBbYmMBWbcGljqj2TUrrGvVfW+FN3w3H21ymJ0xUxBktHx7LNC2czahXAEhCvi2e7gmO afa5VgfSsGxAafNfqZqtnllpUyZTWGb8a01bwPK/KqBwK66r2o9LX2rt0uKrF5scG14x AHjQ== X-Gm-Message-State: AOJu0YxLOOoJlrY2JO+lBIgidNBVUms8DzT4eLK63NJfw7u85pim5D27 HKpc3R3BbWE87cM3DluPJNzroswfDaWffluuq1UTwxss2Gs1tfUEuL/pd7XKeHeSJ7VLQOMo46Y +99U+jw0XZcWQoCfYC4IOobYCJhQjOas7ag== X-Gm-Gg: ASbGnctozT2RMUEytb2mKfqPgHL6AcMH3quCx8GtfoayEQ6QL6wOessEbr4l008R6yS tafKEzHbG6rNu92Y47YxSXr4qsZRM6XK+w9SEsZ03ESbXAJxywKT0gH/aWBf7OpwGllpOSSN7HS SzoMIeTBuyw/S8+xrbwtSTyth/cEgap033shS7bK3Q9KqzILVZKSddHoE69G3iqJj5Zwm4rexnk BGQnvB6CBij64DQDQ== X-Google-Smtp-Source: AGHT+IFOpp55DymHA01VKguFrTxeoPGi7RwUExXcSLKM4Zb/rcFoUyBjqVwRyWWrGWJgQYBtYzbxYgWQ83eViPY91cQ= X-Received: by 2002:a05:6402:5114:b0:62a:768c:221c with SMTP id 4fb4d7f45d1cf-62a768c2539mr9710102a12.35.1757539719393; Wed, 10 Sep 2025 14:28:39 -0700 (PDT) MIME-Version: 1.0 References: <0345A09E-A153-4977-BEE9-0A2053367102@sbc-85.com> <5d5501dc2109$5c784380$1568ca80$@sbc-85.com> In-Reply-To: <5d5501dc2109$5c784380$1568ca80$@sbc-85.com> From: Ray Potcinske Date: Wed, 10 Sep 2025 16:28:26 -0500 X-Gm-Features: AS18NWAGkkAXGX_9tyPSIMXMr2NI1k-BFCfB4YmZpE2LjZoVU8-YetJ_sF7LpS4 Message-ID: Subject: Re: Digi-Key Nibbler Boards To: craig@sbc-85.com Content-Type: multipart/alternative; boundary="000000000000a7336d063e791aab" X-Spam-Status: No, score=-3.9 X-Spam-Score: -38 X-Spam-Bar: --- X-Spam-Flag: NO --000000000000a7336d063e791aab Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I'm going to wait and see if the new CPU helps. If I still have problems I will just send you the board. I really do appreciate your offer. On Mon, Sep 8, 2025 at 4:41=E2=80=AFPM wrote: > All signals should at least stop while the reset is being asserted. That > is not the case? The reset input is working OK? > > > > *From:* Ray Potcinske > *Sent:* Monday, September 8, 2025 2:35 PM > *To:* SBC-85 > *Subject:* Re: Digi-Key Nibbler Boards > > > > 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 thi= nk > 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 signal= . 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 i= f > 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 w= rote: > > =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 itse= lf > 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 the= y > 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 wrote: > > Hi Ray, > > > > I think the rom order is noted in the schematic. The one towards the edg= e > 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 and > applied it. I also only had on-hand 81LS95's not 97's but noticed that th= e > original board used them and saw that the G1 & G2 are tied together anywa= y, > so I figured they will work. One question I have is re the 2 2716's. Whic= h > is the high order? U10 or U11? Also, I burned the EPROMs and noticed th= e > 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 board they wi= ll > 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 have > lots of COSMAC (CDP1802) and related stuff, some Ohio Scientific, Heathki= t > H8, etc. Not really actively trying to get rid of anything but just thoug= ht > 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 numbe= r > > > > 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 decide t= o > go forward with just the board, you can paypal me the shipping cost to th= is > 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 eproms > and k will program or you can buy programmed eproms on my tindie site > > > > https://www.tindie.com/products/helloworld/programmed-eprom-pick-contents= / > > > > 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 usps > 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 rid of i= t > 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> > > --000000000000a7336d063e791aab Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I'm going to wait and see if the new CPU helps. If I s= till have problems I will just send you the board. I really do appreciate y= our offer.


=C2=A0

On Mon, Sep 8, 2025 at 4:41=E2=80=AFPM <craig@sbc-85.com> wrote:

All= signals should at least stop while the reset is being asserted.=C2=A0 That= is not the case?=C2=A0 The reset input is working OK?=

=C2=A0<= /u>

From: Ray Potcinske <potcinske@gmail.com>
Sent: Monday, September 8, = 2025 2:35 PM
To: SBC-85 <craig@sbc-85.com>
Subject: Re: Digi-Key N= ibbler Boards

= =C2=A0

There is signal all over the p= lace. When I do a reset (RESET_N1 low) nothing changes. You would think I w= ould see some start-up sequence of events somewhere. All pulses & wavef= orms are the same all the time. I think the CPU is not crunching....=

=C2=A0

<= p class=3D"MsoNormal">On Mon, Sep 8, 2025 at 1:07=E2=80=AFPM SBC-85 <craig@sbc-85.com> wrote:

You have th= e 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 bo= th tested at the eprom?

= =C2=A0

The standard 7415= 5 should be ok, but it is worth looking at further, I need to look at the s= chematic again and check

=C2=A0

NIBL pretty much= requires everything to work before anything will work.=C2=A0 I think some = RAMless test code is needed.

=C2=A0

=C2= =A0



<= blockquote style=3D"margin-top:5pt;margin-bottom:5pt">

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

=EF=BB=BF

I meant the clock is working properly Right on the money at 4Mhz<= /u>

=C2=A0

I used wire jumpers instead of wire-wrap.

=C2=A0

Don't know if it makes a difference but I onl= y had 74155 and not the LS flavor.

=C2=A0

=C2=A0

On Mon, Sep 8, 2025 at = 12:30=E2=80=AFPM SBC-85= <craig@sbc-85.com= > wrote:

You need to wire wrap the jp1 and 2 since I messed up t= he 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 o= ff in pic. I have tried various configs incl direct serial lines to the JP = pins.

I have various tes= t equipment.

Clock is de= ad-on 4Mhz.

In your vid = you are not using SIN & SOUT=C2=A0but instead Sense & Flag, right?<= u>

=C2=A0

On Mon, Sep 8, 2025 at 10:58=E2=80=AFAM SBC-85 <craig@sbc-85.com> wrote:<= u>

Send me pictures of the board front and back and jumpers and I will see= if I can spot anything=C2=A0



On Sep 8, 2= 025, at 8:24=E2=80=AFAM= , SBC-85 <craig@sb= c-85.com> wrote:

=EF=BB=BF

Hi Ray

=C2=A0

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 i= t output the heartbeat if sense b input is low on reset?=C2=A0 Deselect jum= per installed to enable. address decoder?

=C2=A0

=C2=A0

=C2=A0=



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

=EF=BB=BF

= Hi again Craig,

=C2=A0<= u>

No joy on getting my Nibbler wo= rking. Bus address and data seem to be alive but no serial, flag or sense a= ctivity. I am suspecting the CPU itself as it is a pull from an old S100 bo= ard that looks pretty rough. I'm ordering more INS8060s but they won= 9;t arrive for a while. Might you by chance have one you could sell me? I c= ould=C2=A0give you another back when they arrive. Otherwise, this is a grea= t project and I thank you for doing this. It brings back a little history t= hat was in a better time for technology.

=C2=A0

= Ray

=C2=A0

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

Hi Ray,

=C2=A0

I think the rom ord= er 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

Regards<= u>

crai= g

=C2=A0

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

= =C2=A0

Hey Craig!

=C2=A0

I got the board built but not yet running. I found your R1 = & R2 fix and applied it. I also only had on-hand 81LS95's not 97= 9;s but noticed that the original board used them and saw that the G1 &= G2 are tied together anyway, so I figured they will work. One question I h= ave is re the 2 2716's. Which is the high order? U10 or U11?=C2=A0 =C2= =A0Also, I burned the EPROMs and noticed the there are 2 releases for the h= igh order - will either work?

=C2=A0

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

=C2=A0

<= p class=3D"MsoNormal">Thanks again,=C2=A0 =C2=A0Ray

=

=C2=A0

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

H= i Ray, thanks for the update.=C2=A0 Make sure you have downloaded the lates= t schematic on the project page, if we find any errors on the board they wi= ll be updated there.=C2=A0 also the latest ROMs are there.=

=C2=A0=

I w= ill keep your items in mind, maybe the ohio scientific.=C2=A0 I think they = were very good value for money.

=C2=A0

Regards<= /p>

craig

=C2=A0

<= p class=3D"MsoNormal">From: Ray Potcinske <potcinske@gmail.com>
Sent: Thursday, Sept= ember 4, 2025 4:09 PM
To: craig@sbc-85.com
Subject: Re: Digi-Key Nibbler= Boards

=C2=A0<= u>

Craig,

I finally got the PCB yesterday. Our local USPS is really ba= d. 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 actively trying to get rid of anything but just thought= I'd=C2=A0let you know.

Thanks,=C2=A0 Ray

= =C2=A0

On Thu, Aug 28, 20= 25 at 7:42=E2=80=AFPM &= lt;craig@sbc-85.com> wrote:

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<= u>

Tracking Nu= mber

9400150206217253252770<= u>

=C2= =A0

=C2=A0

Regards

=C2=A0

craig

=C2=A0<= /p>

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

=C2=A0

I rounded it up. Thanks for your efforts

=

=C2=A0

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

Thanks, I will!=C2=A0

=C2=A0

<= div>

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

Hi Ray,

=C2=A0

To


RAY POTCINSKE=

15775 RANCHET= TE RD, TERRELL=C2=A0TX,=C2=A075161-5539, US

=C2=A0<= /p>

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

= Thanks

craig

=C2=A0

From: SBC-85 <craig@sbc-85.com>
S= ent: Wednesday, August 27, 2025 8:16 PM
To: Ray Potcinske <= ;potcinske@gmail.c= om>
Subject: Re: Digi-Key Nibbler Boards<= /u>

=C2=A0

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

=C2=A0

=C2=A0

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

=C2=A0

On Aug 27, 2025, a= t 4:08=E2=80=AFPM, Ray = Potcinske <potc= inske@gmail.com> wrote:

= =EF=BB=BF

Thanks!=C2=A0 Could I also get a EPROM wit= h the NIBL Basic?

=C2=A0

On Wed, Aug 27, 2025 at 1:14<= span style=3D"font-family:Arial,sans-serif">=E2=80=AFPM <craig@sbc-85.com> wro= te:

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<= /u>

From: Ray Potcinske <potcinske@gmail.com>
Sent: Wednesday, August 27,= 2025 10:39 AM
To: 052922@sbc-85.com
Subject: Digi-Key Nibbler Boards

=C2=A0

Hello,

I have been looking at your resurrection and it is great!=C2=A0 I act= ually had an original Nibbler 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 s= et to re-create=C2=A0my own. I can pay in advance if you like (PayPal?)<= /u>

=C2=A0

Ray Potcinske

15775 Ranchette Rd.

Terrell, TX=C2=A0 75161

=
<= /blockquote>

<20250908_120406.jpg>

<20250908_120423.jpg>

--000000000000a7336d063e791aab--