Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id 4H9lIYMqiWeM6gUAcizydQ (envelope-from ) for ; Thu, 16 Jan 2025 09:49:23 -0600 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Thu, 16 Jan 2025 09:49:23 -0600 Received: from mail-wr1-f49.google.com ([209.85.221.49]:43033) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.96.2) (envelope-from ) id 1tYS7X-001s5n-0P for craig@sbc-85.com; Thu, 16 Jan 2025 09:49:23 -0600 Received: by mail-wr1-f49.google.com with SMTP id ffacd0b85a97d-38be3bfb045so1389111f8f.0 for ; Thu, 16 Jan 2025 07:49:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1737042551; x=1737647351; 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=LWHh8octjDDl6JfzpjVw3apbBYkq3e8X9dFLWNcS4pU=; b=NDyYXP1l3RXEzKf3u4mkRPBn9QtB2IXIzCl5FC3n2GfS61yhVEelFO2LMqE+AYiOlF hTP5OKOFBSMWZBGL+Mi+f95+gOsjeVWFGPe7bMeZaTXfIxeH6AlW1Etk1MvLp9kzhxsU DG7IV36l1memW22LXAUblojau2AAc2PBDdhRK30tvfWO0/QTVq8hEhw4kdBNBHX2l1aL Sku1UIQPOH+vrkPl0LH7wE2DMpiZEY8QCB/h1OyiAW0xFPsTNXLlYZtnzxk+kWax0RiQ fDq7JrGXPRwaA5Kpf3TfPROLxNhSk+B4DG20bnDVTCOj5nOApYSsysYQm3dop2sO3n3S bmZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737042551; x=1737647351; 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=LWHh8octjDDl6JfzpjVw3apbBYkq3e8X9dFLWNcS4pU=; b=KcWNbLaZ3ojtTZ962ohEORdwXfjAnhg9pYOOkP8e8btI91lgGmFyvIkllGNSpT/PSd xzaJKO/ZixuGbKFut0eT3Y8Xd2SonbtniKw/n6CRI6jMzNvfnRssjbJv0JNT2O44CrNC WVYbF2tofFsrDTSH3dFHmx9IohO1OV9LrLN0vLXEaJqyuWJbjuKX/q0ebuUUJDla79Ze isLD2E2lO+/tFzmBroRUbllsIlP7Y9KFFpAay0K1vbrXVFhdy/CiHxwbemEQg4C7ZdDN ziQAPy6vI3DrpCKYK1arUyJfL9j7I2LnQJcSRpJdAD2YnAlXf7XGpUuuZ81gKgVBvNiB 3BzQ== X-Gm-Message-State: AOJu0YxKn+FvyBpVXPzhLKLu38B3ijbGtEKT7PTb48bAs1s8OXIM68k+ EhB8wLaKhJ0jaaV+f9DQH0ZblPEvqi95HZmSy+c44vT6rx6V47YEW9hmeL/nzxt718DIwEW96OE /kBJY+7SXXV+zyrwxGraRtOjrKeHezQ== X-Gm-Gg: ASbGncvYdM+ykHy7EbwtjK7r5Oz0lu0dQtc1n9gZqn2hsH/Gn1rDohYsIQ37bvno3fh dUbRymimIkIhWUer3wdW8s1ZMCnqCdmFrbiuvhw== X-Google-Smtp-Source: AGHT+IHSG7hYgxMveELiC/c8gKKlIdA/32HRnqe56mcUhhKxuXqTCttOP+NkGUCUY0Px1acwe/t8sWQYlK7AnkzSUnk= X-Received: by 2002:a5d:648c:0:b0:38a:906e:16c3 with SMTP id ffacd0b85a97d-38bec4fbceemr3317763f8f.13.1737042551304; Thu, 16 Jan 2025 07:49:11 -0800 (PST) MIME-Version: 1.0 References: <1b7e01db67b7$cd103870$6730a950$@sbc-85.com> In-Reply-To: <1b7e01db67b7$cd103870$6730a950$@sbc-85.com> From: Jon Hales Date: Thu, 16 Jan 2025 15:48:59 +0000 X-Gm-Features: AbW1kvaZXL1_HpYFO9ak4UnWIYrDmNrUkIfLOKRQ8fR7dDC-lPSnxVa8rW__pbc Message-ID: Subject: Re: Intellec 8 To: craig@sbc-85.com Content-Type: multipart/alternative; boundary="0000000000003af8c5062bd4bc58" X-Spam-Status: No, score=-3.9 X-Spam-Score: -38 X-Spam-Bar: --- X-Spam-Flag: NO --0000000000003af8c5062bd4bc58 Content-Type: text/plain; charset="UTF-8" Hi Craig Many thanks for the information. Regards Jon On Thu, 16 Jan 2025 at 01:41, wrote: > Hi Jon, > > > > Schematic for the cheater board is attached. It looks like the two caps > are general decoupling 0.1uF and a bulk storage 1uF. The diode is any old > LED you have sitting around and the diode current limiting resistor is > whatever you like for the LED brightness. LEDs are getting so efficient I > have to keep jacking that up. It was 330ohm back in the day, but I find 1K > keeps the LED from being overbright. > > > > As you suggest, the jumper j1-2 is installed but then the switch settings > do not matter. The output of U21B will be pulled low by the jumper and > PROM_RESIDENT into u28B will always be asserted. So as soon as the address > matches the board is enabled. > > > > Regards > > > > craig > > > > *From:* Jon Hales > *Sent:* Wednesday, January 15, 2025 7:17 AM > *To:* SBC-85 > *Subject:* Intellec 8 > > > > Hi Craig > > > > I hope you are keeping well in early 2025. > > > > This message is to let you know that I have completed the building of the > 8080 version of the replica. [See PS below]. The first step towards > completion was to power-up the backplane with a set of boards - but > unpopulated with ICs. If any of the capacitors were about the fail - or if > I had installed them incorrectly - this was their chance to reveal > themselves. Although none did so. This was also an opportunity to check > that derived voltages - such as -5v for the 8080 - were being produced. > > > > I'm just about ready for a further step, namely to power-up the backplane > with each of the fully populated boards in turn to check voltages, etc. > This perhaps unnecessary, but I'm cautious. At some point (soon), I should > be able to use a Tauntek 8080 in-circuit emulator for further checks. > > > > One of the final details is to ask you to confirm the specifications for > the 'cheater' board: > > - R1, D1, C1 and C2. Also, I assume jumper J1-2 can be fitted on the > imm6-26 - as well as setting all the switches to ON. I intend to use > Intel's V3.0 monitor code in a 2732 for initial tests - and I also have > 1702As for later. I noticed your discussion with Mattis (April 23) about > his 'V4.0' code in which some bugs were revealed. I'm asking Mattis for > documentation of his paper tape emulator. > > > > I completed the 'doodad' some time ago, but it doesn't seem feasible to > use this with the 'cheater'. So I'll be aiming - initially - to exploit > ports on the imm6-61 for a terminal. > > > > You may well wonder why it has taken me so many months to get to this > point. It's mainly that the build has been a considerable 'learning > experience' - and a good one. I also had treatment for prostate cancer - a > first stage in May and a second during October - hopefully enough to deal > with it. > > > > Best regards > > > > PS A kind person from whom I purchased some Intel manuals has presented me > with many of the parts required for the 8008 board - but not an 8008. > That's a future project. > > > > Jon > > > > > --0000000000003af8c5062bd4bc58 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Craig

Many thanks for the informatio= n.

Regards

Jon

On Thu, 16 Jan 2025 at 01:41, <craig@sbc-85.com> wrote:

Hi Jon,

=C2=A0

Schematic for the cheater board is attached.=C2=A0 It= looks like the two caps are general decoupling 0.1uF and a bulk storage 1u= F.=C2=A0 The diode is any old LED you have sitting around and the diode cur= rent limiting resistor is whatever you like for the LED brightness.=C2=A0 L= EDs are getting so efficient I have to keep jacking that up.=C2=A0 It was 3= 30ohm back in the day, but I find 1K keeps the LED from being overbright.

=C2=A0

As you suggest, the jumper j1-2 is installed but then the switc= h settings do not matter.=C2=A0 The output of U21B will be pulled low by th= e jumper and PROM_RESIDENT into u28B will always be asserted.=C2=A0 So as s= oon as the address matches the board is enabled.

=C2=A0

Regards

=C2=A0

craig

=C2=A0

From: Jon Hales <jonhales@gmail.com>
Sent= : Wednesday, January 15, 2025 7:17 AM
To: SBC-85 <craig@sbc-85.com>
= Subject: Intellec 8

=C2=A0

Hi Craig=

=C2=A0

I hope you are keeping well in early 2025.=

=C2=A0

This message is to let you know that I have completed = the building of the 8080 version of the replica. [See PS below]. The first = step towards completion was to power-up the backplane with a set of boards = - but unpopulated with ICs. If any of the capacitors were about the fail - = or if I had installed them incorrectly - this was their chance to reveal th= emselves. Although none did so. This was also an opportunity to check that = derived voltages - such as -5v for the 8080 - were being produced.

=C2=A0

I'm just about ready for a further step, name= ly to power-up the backplane with each of the fully populated boards in tur= n to check voltages, etc. This perhaps unnecessary, but I'm cautious. A= t some point (soon), I should be able to use a Tauntek 8080 in-circuit emul= ator for further checks.

=C2=A0

One of the final= details is to ask you to confirm the specifications for the 'cheater&#= 39; board:

- R1, D1, C1 = and C2. Also, I assume jumper J1-2 can be fitted on the imm6-26 - as well a= s setting all the switches to ON. I intend to use Intel's V3.0 monitor = code in a 2732 for initial tests - and I also have 1702As for later. I noti= ced your discussion with Mattis (April 23)=C2=A0about his 'V4.0' co= de in which some bugs were revealed. I'm asking Mattis for documentatio= n of his paper tape emulator.

=C2=A0

I completed= the 'doodad' some time ago, but it doesn't seem feasible to us= e this with the 'cheater'. So I'll be aiming - initially - to e= xploit ports on the imm6-61 for a terminal.=C2=A0

=C2=A0

You may well wonder why it has taken me so many months to get to t= his point. It's mainly that the build has been a considerable 'lear= ning experience' - and a good one. I also had treatment for prostate ca= ncer - a first stage in May and a second during October - hopefully enough = to deal with it.

= =C2=A0

Best regards

=C2=A0

=

PS A kind person from whom I purchased some Intel ma= nuals has presented me with many of the parts required for the 8008 board -= but not an 8008. That's a future project.

=

=C2=A0

Jon

=C2=A0<= u>

=C2=A0

<= /div>
--0000000000003af8c5062bd4bc58--