Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id 3Io5K0MKgWPFjgQAcizydQ (envelope-from ) for ; Fri, 25 Nov 2022 12:32:35 -0600 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Fri, 25 Nov 2022 12:32:35 -0600 Received: from mail128-135.atl41.mandrillapp.com ([198.2.128.135]:42282) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1oydV5-001FcJ-AG for craig@sbc-85.com; Fri, 25 Nov 2022 12:32:35 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tindie.com; s=mandrill; t=1669401144; x=1669703544; i=donotreply@tindie.com; bh=iTGFT0/rNWIRN2ajQhuwkr5L+O/hWOEKQ3g1eHXt7q0=; h=From:Subject:Reply-To:Message-Id:List-Unsubscribe:List-Id: List-Archive:List-Post:To:Feedback-ID:Date:MIME-Version: Content-Type:CC:Date:Subject:From; b=AfZog9Cra1R2fjFOh0zCPkHcipGk5kZIMY9Er/htKkzNi0mlrpn1lxDBnjCVYKdjI HmKcXL9cYdhFw9B9NtLv7QAW9fZeOl2qeWkIsLkxWlY5NJkmJT3mHf/Ju7wzDtZITp MS8upA2HXChbMHbRYYJy8PG1gzYm0v/UCrZLxMJE= Received: from pmta08.mandrill.prod.atl01.rsglab.com (localhost [127.0.0.1]) by mail128-135.atl41.mandrillapp.com (Mailchimp) with ESMTP id 4NJk485kDvzHXYh16 for ; Fri, 25 Nov 2022 18:32:24 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mandrillapp.com; i=@mandrillapp.com; q=dns/txt; s=mandrill; t=1669401144; h=From : Subject : Reply-To : Message-Id : List-Unsubscribe : List-Id : List-Archive : List-Post : To : Date : MIME-Version : Content-Type : From : Subject : Date : X-Mandrill-User : List-Unsubscribe; bh=iTGFT0/rNWIRN2ajQhuwkr5L+O/hWOEKQ3g1eHXt7q0=; b=Mr6+Q4OAlsGKtBRBpOp6eWjy9MXDGJTjQXcIt+iLUagevFCzPBvhT+cnZQcbz20zkNvVUM z0V/DKWpP/8TYu5wL5bJANl7QqG8FxlyDFbtrWCdvb+XnoFu9RRw/yS1GQfp5/vv35jrF4Iw DFzoYsg+RdSYNxZHN+ZWo18i9Xuoo= From: glen hollander via Tindie Community Subject: [Tindie Community] [PM] Possible errata on sec-85 and serial bus monitor board Received: from [54.71.20.37] by mandrillapp.com id 802c7841f02c4614986788790b19cc99; Fri, 25 Nov 2022 18:32:24 +0000 X-Auto-Response-Suppress: All Reply-To: glen hollander via Tindie Community Message-Id: List-Unsubscribe: Auto-Submitted: auto-generated Precedence: list List-Id: Tindie Community List-Archive: https://discuss.tindie.com/t/possible-errata-on-sec-85-and-serial-bus-monitor-board/319841 List-Post: To: craig@sbc-85.com X-Report-Abuse: Please forward a copy of this message, including all headers, to abuse@mandrill.com X-Report-Abuse: You can also report abuse here: http://mandrillapp.com/contact/abuse?id=30145078.802c7841f02c4614986788790b19cc99 X-Mandrill-User: md_30145078 Feedback-ID: 30145078:30145078.20221125:md Date: Fri, 25 Nov 2022 18:32:24 +0000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="_av-It-uCUdyxN1KB9MiskxtnA" X-Spam-Status: No, score=-1.5 X-Spam-Score: -14 X-Spam-Bar: - X-Spam-Flag: NO --_av-It-uCUdyxN1KB9MiskxtnA Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi Craig, I am working on your SBC-85 and bus monitor board. Am finding it interesting as I had worked on an s-100 system many years ago. I did not understand much of the programming and other things (life) got in the way. Suffice to say, I have time to pursue this now and was working on your board and found several items that might be errata in the notes or the schematics. Being more of a hardware person than a software person learning the software is somewhat tough sledding. Maybe I am making more of it than needs to be but that is why I am doing these 'exercises' is to better understand the 8085 and related processors. Back to the errata on the bus monitor board, I am not finding anything in the schematic showing where diode D56 is located and in tracing that and C47, seems as though that capacitor is not shown correctly in the schema. Based on continuity checks the diode is where the capacitor is shown and the capacitor actually goes to ground. Also there seems to be two different values indicated for C47, the schematic calls for a 1 uf and the BOM calls for a 100 pf. On the SBC-85 board jumpers JP% and JP6 are marked in the notes as pin 1 being on the top of the board, and I am finding appears as though pin 3 is along the top edge of the board at least according to my way of looking at things. Also was wondering as I am using a preprogrammed eprom with the bus monitor program loaded on it ( a 2764 eprom) and tried copying the program into a 28c256 eprom and moving jumpers to accommodate the -256 and things do not seem to respond correctly. Does the programming need editing to reflect the larger eprom? Looking forward to some advice on these issues. Thanks for your time. [Sent from SBC-85 Bus Monitor Supreme v1.2b BARE BOARD TIN Page] --- [Visit Message](https://discuss.tindie.com/t/possible-errata-on-sec-85-and-serial-bus-monitor-board/319841/1) or reply to this email to respond to [ccandrews](https://discuss.tindie.com/u/ccandrews), [Glenh](https://discuss.tindie.com/u/glenh). To unsubscribe from these emails, [click here](https://discuss.tindie.com/email/unsubscribe/10932987e5ad146398c5783082e3335055a9228f8f7e86a04ecba6dea8a9fb9b). --_av-It-uCUdyxN1KB9MiskxtnA Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Glenh
No= vember 25

Hi = Craig, I am working on your SBC-85 and bus monitor board. Am finding it int= eresting as I had worked on an s-100 system many years ago. I did not under= stand much of the programming and other things (life) got in the way. Suffi= ce to say, I have time to pursue this now and was working on your board and= found several items that might be errata in the notes or the schematics. B= eing more of a hardware person than a software person learning the software= is somewhat tough sledding. Maybe I am making more of it than needs to be = but that is why I am doing these =E2=80=98exercises=E2=80=99 is to better = understand the 8085 and related processors.
Back to the errata on the bus monitor board, I am not finding anything in t= he schematic showing where diode D56 is located and in tracing that and C47= , seems as though that capacitor is not shown correctly in the schema. Base= d on continuity checks the diode is where the capacitor is shown and the ca= pacitor actually goes to ground. Also there seems to be two different value= s indicated for C47, the schematic calls for a 1 uf and the BOM calls for a= 100 pf.
On the SBC-85 board jumpers JP% and JP6 are marked in the notes as pin 1 be= ing on the top of the board, and I am finding appears as though pin 3 is al= ong the top edge of the board at least according to my way of looking at th= ings.
Also was wondering as I am using a preprogrammed eprom with the bus monitor= program loaded on it ( a 2764 eprom) and tried copying the program into a = 28c256 eprom and moving jumpers to accommodate the -256 and things do not s= eem to respond correctly. Does the programming need editing to reflect the = larger eprom? Looking forward to some advice on these issues. Thanks for yo= ur time. [Sent from SBC-85 Bus Monitor Supreme v1.2b BARE BOARD TIN Page]<= /p>

Visit Message or reply to this em= ail to respond to ccand= rews, Glenh.

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