Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id +NbcHJo+jGiFCgoAcizydQ (envelope-from ) for ; Thu, 31 Jul 2025 23:12:10 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Thu, 31 Jul 2025 23:12:10 -0500 Received: from mail-pj1-f50.google.com ([209.85.216.50]:46481) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.1) (envelope-from ) id 1uhh7p-00000002uEg-3wBq for craig@sbc-85.com; Thu, 31 Jul 2025 23:12:10 -0500 Received: by mail-pj1-f50.google.com with SMTP id 98e67ed59e1d1-31f017262d9so1284552a91.1 for ; Thu, 31 Jul 2025 21:12:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1754021518; x=1754626318; 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=a884W2M7XNe+mtOkTTlWyU81+BUi1JJNbEjNDpHn2Yo=; b=DLXPr0vYBbF/v34ofY4m0uphsXBlc4xluA2T81WuuAUuHk595Z2utdtbpi1hFCuoI+ SZwRL64LS0eA5vURAA6C0AJ66YUFqGMbR9r9PcA66zieeXtGEBIvc9fan5j+P3bJEFWd NczfyTdCTiHWnhukLQu59pdrlpt4nPhdXNphoWvamDQZA3RCXirA971tauBDiaiTi94l dh9ES+C4rYQ5VSJ5BDL3mitySkqpoOqQFhgYobdUBdcSgm+gpKrPn846etGokvN8GCYv EpJzoTZnHUMgtCZBTBZth0gdp9hPB6VdmzIkD/fWiAK2u+dAnRMuHRU4T6GLd+iFxm2Q LkqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754021518; x=1754626318; 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=a884W2M7XNe+mtOkTTlWyU81+BUi1JJNbEjNDpHn2Yo=; b=bqMzU7I4/W5aokFMeodXqkeGCpzUWg2PJNtWUFRKXo9b2ZrF+9M8/e+25CEVkYdbca 9655x7M+/TCFK9CmzDt7n5utL4lqaLYBD9VS26F2i2lHoaFaemegWxMUAYHffN5ViOYp FlfrDhydYwHLJ1LrykMahLE8OfaRMYfU95gQx417bFDJkuGogmalMRFTHyAemscumxcW BDwvAUpXlVuSEJXF3Hm/l6cx5R4t+/Sewi60JNADUeZne61aHiIF0XuVT7TAtOBjyCZh Z4HeuI4qtErRWVOWI95O3WaYs595NyAjsL7sq/0uADS89Ktfm5nnkkoscNHitA272Hcc Fucw== X-Gm-Message-State: AOJu0YyLGJcm8+RJiJlj42wCJocPGhPcgCQKaDP5cMzJsghuSVdWYLp3 flvw+hne1G/f7fqbh/byCsOvKK8ls5Ag5k0D4SnW/pqF8OVCXg8h0IT5cusU6NaOiiSTHLcYUE7 /cpwz59sEmOUCCI3WCTTadXwEkW8ALXRmqWDQ X-Gm-Gg: ASbGncvy3dUHbGwKY5euS09BadQRAGZYV2k8a19WQqIhsY28J5ShpPm8eQT4cSTU48t BsiNI0kAWq/BWOyq+6TIvQq7TTdUOgrvtJph6DHpA1FIR++VDaJXkieAKOJYgo0o22aBLlVd+kO gvXT0DNS97Vo7+nVtDiQ6VUVu8IageO7jTdoBDWOR+3bmVgfJn1SCzRnOGVdNx1zTX4VP8nFe30 gY= X-Google-Smtp-Source: AGHT+IEWc3MP/7klDCpf47TFXRCqC3QK9t/vGLcH/y/EUk9y9+dh5U7Funl0FyqC8BKsNcwsQZrAHqReb3BlnNyvtec= X-Received: by 2002:a17:90b:3890:b0:31f:2ee3:1ab7 with SMTP id 98e67ed59e1d1-31f5de65667mr11670091a91.32.1754021518341; Thu, 31 Jul 2025 21:11:58 -0700 (PDT) MIME-Version: 1.0 References: <84024B58-4EE9-4BDA-9982-604F71257A3C@sbc-85.com> In-Reply-To: <84024B58-4EE9-4BDA-9982-604F71257A3C@sbc-85.com> From: Patrick Wong Date: Thu, 31 Jul 2025 21:11:47 -0700 X-Gm-Features: Ac12FXw6NVLdoDkRYwI3U-bwpXi5CZAoHA_tWEHuIjxCsFrkDPS19cXKzObcQTI Message-ID: Subject: Re: MDS-ROM-SIM-100 To: SBC-85 Content-Type: multipart/alternative; boundary="000000000000877a18063b45f58d" X-Spam-Status: No, score=-3.9 X-Spam-Score: -38 X-Spam-Bar: --- X-Spam-Flag: NO --000000000000877a18063b45f58d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Craig. Good to hear from you. If you mean tomorrow, August 1, unfortunately, I'm in Rancho Cordova helping out my family. Will return by Wednesday, Aug 6. If you mean September, yes i should be available. Let me know. Thanks. Patrick On Thu, Jul 31, 2025 at 8:43=E2=80=AFPM SBC-85 wrote: > Hi Patrick, will you be around the first of next month so I can pick up > those things i forgot? > > On Feb 19, 2025, at 9:00=E2=80=AFAM, Patrick Wong wrote: > > =EF=BB=BF > Hi Craig, > > I'll let you know if I find any info on this or if I find this board. > > Best regards, > > Patrick Wong > Northwest Technical Inc. > 16920 Old County Road > Brookings, OR 97415 > Tel: 541-469-6644 > Email: patrick.nwtec@gmail.com > Website: www.multibus-international.com > > > On Tue, Feb 18, 2025 at 5:05=E2=80=AFPM wrote: > >> Hi Patrick >> >> >> >> Made it back to Vancouver, thanks for meeting me yesterday and taking >> care of that chassis & MDS-800 cover until I get a chance to come back >> down. That chassis will fit in my little airplane but the MDS-800 would= be >> a tight squeeze. >> >> >> >> Here is the catalog cut sheet and a photograph of the MDS-ROM simulator >> board. Please let me know if you come across any information on them. = I >> have the boards running from the MDS side, i.e., I have access to the >> onboard RAM and the next step is to start reverse engineering the interf= ace >> for the device under test. One thing I am trying to figure out first is >> this business of the operating modes you see in the silkscreen on the bo= ard >> in a couple of places. Any idea what Mode 18 and Mode M could mean? I >> have never seen intel use that terminology before. These boards were >> designed so you could have up to four of them in a system and continue t= he >> memory from one board to the next. From the MDS perspective, you set th= e >> high address nibble in the jumpers in the bottom left plus which board o= f >> the four this board is which set the next two address lines down. From = the >> device under test side, the memory could be byte wide or multi-byte and = I >> am guessing that is where the Mode 18 or mode M comes in. in the top ri= ght >> corner the user rom is set in octal or it is set to Mode M. At this po= int >> I am guessing that mode 18 is when the boards were accessed individually >> for byte-wide memory and Mode M is when all boards were accessed >> simultaneously for 32-bit wide access. >> >> >> >> Any insight would be appreciated. >> >> >> >> Thanks >> >> craig >> > --000000000000877a18063b45f58d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Craig.=C2=A0

Good to hear from you. = If you mean tomorrow, August=C2=A01, unfortunately, I'm in Rancho Cordo= va helping out my family.=C2=A0 Will return by Wednesday, Aug 6.=C2=A0
=
If you mean September, yes i should=C2=A0be available.
=

Let me know.=C2=A0 Thanks.

Pat= rick



On Thu,= Jul 31, 2025 at 8:43=E2=80=AFPM SBC-85 <craig@sbc-85.com> wrote:
Hi Patrick, will you be around the first of next month so I can pick up= those things i forgot?

On Feb 19, 2025, at 9:00=E2=80=AFAM, Patrick Wong <patrick.nwtec@gmail.com> wr= ote:

= =EF=BB=BF
Hi Craig,

I'll let you kno= w if I find any info on this or if I find this board.

<= div>Best regards,

Patrick Wong
Northwest Technical Inc.
16920 = Old County Road
Brookings, OR =C2=A097415
Tel: 541-469-6644
Email:= patrick.nwtec= @gmail.com
Website: www.multibus-international.com

=

= On Tue, Feb 18, 2025 at 5:05=E2=80=AFPM <craig@sbc-85.com> wrote:

Hi Patrick

= =C2=A0

Made it back to Vancouver, thanks f= or meeting me yesterday and taking care of that chassis & MDS-800 cover= until I get a chance to come back down.=C2=A0 That chassis will fit in my = little airplane but the MDS-800 would be a tight squeeze.

=

=C2=A0

Here = is the catalog cut sheet and a photograph of the MDS-ROM simulator board.= =C2=A0 Please let me know if you come across any information on them.=C2=A0= I have the boards running from the MDS side, i.e., I have access to the on= board RAM and the next step is to start reverse engineering the interface f= or the device under test.=C2=A0 One thing I am trying to figure out first i= s this business of the operating modes you see in the silkscreen on the boa= rd in a couple of places.=C2=A0 Any idea what Mode 18 and Mode M could mean= ?=C2=A0 I have never seen intel use that terminology before.=C2=A0 These bo= ards were designed so you could have up to four of them in a system and con= tinue the memory from one board to the next.=C2=A0 From the MDS perspective= , you set the high address nibble in the jumpers in the bottom left plus wh= ich board of the four this board is which set the next two address lines do= wn.=C2=A0 From the device under test side, the memory could be byte wide or= multi-byte and I am guessing that is where the Mode 18 or mode M comes in.= =C2=A0 in the top right corner the user rom is set in octal or it is set to= =C2=A0Mode M.=C2=A0 At this point I am guessing that mode 18 is when the b= oards were accessed individually for byte-wide memory and Mode M is when al= l boards were accessed simultaneously for 32-bit wide access.=

=C2=A0

A= ny insight would be appreciated.

=C2=A0

Thanks

craig

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