Return-Path: Delivered-To: craig@sbc-85.com Received: from gator4254.hostgator.com by gator4254.hostgator.com with LMTP id 8IkyEsuYZ2Z43AgAcizydQ (envelope-from ) for ; Mon, 10 Jun 2024 19:22:35 -0500 Return-path: Envelope-to: craig@sbc-85.com Delivery-date: Mon, 10 Jun 2024 19:22:35 -0500 Received: from p-impout004aa.msg.pkvw.co.charter.net ([47.43.26.135]:39655 helo=p-impout004.msg.pkvw.co.charter.net) by gator4254.hostgator.com with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96.2) (envelope-from ) id 1sGpHW-002seN-2W for craig@sbc-85.com; Mon, 10 Jun 2024 19:22:35 -0500 Received: from GeorgeAdams ([174.97.1.103]) by cmsmtp with ESMTPA id GpHJsQsaFXdDUGpHKsnqOz; Tue, 11 Jun 2024 00:22:22 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cinci.rr.com; s=c20240129; t=1718065342; bh=D23z2O9+gPkAd3O69SwoMnxy6zJwf009Wkc+7P1W4KI=; h=From:To:References:In-Reply-To:Subject:Date; b=LEg6TIcYYyV/HG+DsHNAdz77uaxFUawmSAM1L2edfZoSfgE9Dh5XtT+S7MH8x4iXI AFc/QX1h6rl9D9cul3XSq1g3h6+jXXUCU01GWa9aYizxRFFjQ0nXhUTWioTpYUEJba Y0R2zOpThb4b4wND0qo4bHzn0qDMsXC3FquYZUbaGqTAtx/wsP7xMLou3ylW7O1H08 N6gQPMzM3qUA43WKCVICd+Uze1uObWUHVrkIvl0p/ba07Gee0TWAeyaxYJi/DqG+Fs hAGO43/przh0H0ioTr2HZNzA9OeKTpEzlYZfFU7rVyDWYeglCaaNGjea1miL/Db6wU vIfLIQYPqAKow== X-Authority-Analysis: v=2.4 cv=WowtM8fv c=1 sm=1 tr=0 ts=666798be a=OzurZGb7dcUwVJBQbH0rwg==:117 a=OzurZGb7dcUwVJBQbH0rwg==:17 a=DAwyPP_o2Byb1YXLmDAA:9 a=HjitWDSJAAAA:8 a=ayC55rCoAAAA:8 a=_6GpL_ENAAAA:8 a=lkwqxCcCpzpL_BsT6GsA:9 a=QEXdDO2ut3YA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=4d2D4LtiAAAA:8 a=6XLI8c5e2Qn3AIis:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 a=lqcHg5cX4UMA:10 a=IB1QFG2aBfq3amWdyr0s:22 a=hJnrvW8ITIrk0Oi8sSDQ:22 From: To: "'SBC-85'" References: <000101dabb76$45801d50$d08057f0$@cinci.rr.com> In-Reply-To: Subject: RE: SDK85+ Debug SUCCESS! Date: Mon, 10 Jun 2024 20:22:21 -0400 Message-ID: <000001dabb95$6dbbb3f0$49331bd0$@cinci.rr.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01DABB73.E6AD9660" X-Mailer: Microsoft Outlook 16.0 Thread-Index: Adq7lVdWwesTG/IwT/KkiWJLmQrSjA== Content-Language: en-us X-Antivirus: Avast (VPS 240610-4, 6/10/2024), Outbound message X-Antivirus-Status: Clean X-CMAE-Envelope: MS4xfLyrcbCyCSC9oTbn1Rx1Yk93RTbG7L4yQCA3cKfqyd5Hc0ll6D3JFTKfC65IkacrO6f7D4zIcj5BXS8cpvbhJDLJF1VG7BlyRNdJuAhKzCUiXfc+QAnM GHCddcrHZad2swTnQNCj1guCoDRfUCO2LmXgPfd4Li1/4AzLAmSk1LCovnAipiTL6i/V/paoOnz29Q== X-Spam-Status: No, score=-0.6 X-Spam-Score: -5 X-Spam-Bar: / X-Spam-Flag: NO This is a multipart message in MIME format. ------=_NextPart_000_0001_01DABB73.E6AD9660 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Craig, I checked the interrupts and there are none being activated. Thanks for poi= nting that out. So, after reviewing your code where the line =E2=80=98DELAY VALUES IF ONE W= AIT STATE=E2=80=99 is, it dawned on me that the READY Line from U2-8755 was= being used by my installing JP1.1-2. So it was removed and the baud rate i= s now back to 2400. The delay values used in the code are for no wait state= s, and by installing the jumper it made the processor wait causing the baud= rate to be slower. Finally, it works!! I see from reviewing the original SDK85 schematics, the READY line from the= 8755=E2=80=99s is an optional jumper. Thanks again for the help. Regards, George From: SBC-85 Sent: Monday, June 10, 2024 5:22 PM To: adamsgl@cinci.rr.com Subject: Re: SDK85+ Debug I don=E2=80=99t get it. You are getting a good clock output at 1/2 the crystal frequency, but the b= aud rate is some random screwy value. At that screwy value, you are getting= a reliable output. Check that interrupts are turned off and check with your scope . With a par= tially populated board maybe something is slowing the processor down. On Jun 10, 2024, at 1:39=E2=80=AFPM, adamsgl@cinci.rr.com wrote: =EF=BB=BF Craig, 3.2 Mhz (just like on my STD85 cpu board) George From: SBC-85 > Sent: Monday, June 10, 2024 4:30 PM To: adamsgl@cinci.rr.com Subject: Re: SDK85+ Debug What is the frequency of CLK output on the 8085? On Jun 10, 2024, at 1:26=E2=80=AFPM, adamsgl@cinci.rr.com wrote: =EF=BB=BF Craig, Yes, that is correct. Changing the terminal baud rate to 1883, I get the si= gnon and am able to enter commands. Regards, George From: SBC-85 > Sent: Monday, June 10, 2024 4:18 PM To: adamsgl@cinci.rr.com Subject: Re: SDK85+ Debug You are saying that you get the signon when you change your baudrate to 188= 3 ? On Jun 10, 2024, at 11:39=E2=80=AFAM, adamsgl@cinci.rr.com wrote: =EF=BB=BF Hi Craig, Yes, the boards and keycaps arrived. Thank You for including the alignment= fixture. I am only using the serial port for now as I haven=E2=80=99t received all t= he parts from Mouser and ebay. The firmware is iSDK_85+ version 2.1. The only change I made was to jmp to = the tty monitor regardless of the state of the RIM value. (in the label RES= 10 the JC was changed to JMP) When looking at the SOD line with digital scope (logic) there are framing e= rrors on every byte transmitted with the terminal set to 2400 baud. After reviewing the bit timing on the scope, 1 bit time is 0.531 ms which i= s 1/0.531ms =3D 1883 baud. And I now have a signon message =E2=80=9CSDK-85+= VER 2.1=E2=80=9D. Not sure where that came from, but I will continue to r= eview the code and the hardware to see where that is. I suspected a baud ra= te issue to start, but had to get smart enough to check the bit timing on t= he scope to prove my idea. Also, I wanted to let you know that I reworked the SDK85 eprom programmer t= hat I previously sent you the link to, so that I would plug into J8 on the = SDK85+ board. The files should be ready for the fab shop in a few days. It = will now plug into the original SDK85 and also the SDK85+ boards directly w= ithout i/o map changes. Regards, George From: SBC-85 > Sent: Monday, June 10, 2024 11:08 AM To: adamsgl@cinci.rr.com Subject: Re: SDK85+ Debug Hi George I was just going to ask if the boards and keycaps arrived okay. Are there other signs of life? Is the display showing anything or are you = just trying the serial first? What firmware are you using? Including version? I think I brought the SDK-8= 5+ firmware up to 9600 but would need to look at the code. I see your installed IC list, I will need to look at the schematic. As long= as the 8085 can fetch instructions and has RAM, the SOD should work proper= ly. I would take out the MAX and just look at the TTL signal on SOD until = you get it going correctly. On Jun 9, 2024, at 6:09=E2=80=AFPM, adamsgl@cinci.rr.com wrote: =EF=BB=BF Hi Craig, I have assembled the SDK-85 and could use a little help, as I am somewhat o= ut of ideas. The problem I am having is the serial output from the board is scrambled. W= hen looking at it with a digital scope, on the 8085 SDO pin, there are fram= ing errors. The processor clock is correct at 6.144 Mhz, and the processor runs and app= ears to access the 8755 correctly. (especially since there is serial output= ) Also tested with the max232 removed with the digital scope on the 8085 with= the same results. The Max232 has the correct voltages on pin 2 (9.6v) and pin 6 (-9.8). I have U1, U2, U3, U6, U7, U13 and U14 installed, all other ic=E2=80=99s a= re not installed. JP1 (1-2). All the chips have been swapped with those on my STD-85 board with no chang= e. Except for the 8755 and I have tried others. Usually this is a timing issue, baud rate setting (2400) (the numbers for t= he serial timing in the code are the same as the STD85, so I=E2=80=99m gues= sing this is also 2400). Tried other baud rates on the terminal with no luck. Any ideas where to look would be appreciated. Thanks Again, George Virus-free. www.avast.com -- This email has been checked for viruses by Avast antivirus software. www.avast.com ------=_NextPart_000_0001_01DABB73.E6AD9660 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Craig,

 

I checked = the interrupts and there are none being activated. Thanks for pointing = that out.

 

So, after reviewing your code where the line = =E2=80=98DELAY VALUES IF ONE WAIT STATE=E2=80=99 is, it dawned on me = that the READY Line from U2-8755 was being used by my installing = JP1.1-2. So it was removed and the baud rate is now back to 2400. The = delay values used in the code are for no wait states, and by installing = the jumper it made the processor wait causing the baud rate to be = slower.

 

Finally, it works!!

 

I see from = reviewing the original SDK85 schematics, the READY line from the = 8755=E2=80=99s is an optional jumper.

 

Thanks again = for the help.

 

Regards,

 

George

 

 

 

From: SBC-85 = <craig@sbc-85.com>
Sent: Monday, June 10, 2024 5:22 = PM
To: adamsgl@cinci.rr.com
Subject: Re: SDK85+ = Debug

 

I = don=E2=80=99t get it. 

You are getting a good clock output at 1/2 the crystal = frequency, but the baud rate is some random screwy value. At that screwy = value, you are getting a reliable = output. 

 

Check that interrupts are turned off and check with = your scope . With a partially populated board maybe something is slowing = the processor down. 



On Jun 10, 2024, at 1:39=E2=80=AFPM, adamsgl@cinci.rr.com = wrote:

=EF=BB=BF

Craig,

 

3.2 Mhz = (just like on my STD85 cpu board)

 

George

 

 

From: SBC-85 <craig@sbc-85.com> =
Sent: Monday, June 10, 2024 4:30 PM
To: adamsgl@cinci.rr.com
Subje= ct: Re: SDK85+ Debug

 

What is = the frequency of CLK output on the 8085?




On Jun 10, 2024, at 1:26=E2=80=AFPM, adamsgl@cinci.rr.com = wrote:

=EF=BB=BF

=

Craig,

 

Yes, that is = correct. Changing the terminal baud rate to 1883, I get the signon and = am able to enter commands.

 

Regards,

 

George

 

 

From: SBC-85 <craig@sbc-85.com> =
Sent: Monday, June 10, 2024 4:18 PM
To: adamsgl@cinci.rr.com
Subje= ct: Re: SDK85+ Debug

 

You are = saying that you get the signon when you change your baudrate to 1883 = ?





On Jun 10, 2024, at 11:39=E2=80=AFAM, adamsgl@cinci.rr.com = wrote:

=EF=BB=BF

=

Hi Craig,

 

Yes, the = boards and keycaps arrived.  Thank You for including the alignment = fixture.

 

I am only using the serial port for now as I = haven=E2=80=99t received all the parts from Mouser and = ebay.

 

The firmware is iSDK_85+ version 2.1. The only change = I made was to jmp to the tty monitor regardless of the state of the RIM = value. (in the label RES10 the JC was changed to JMP)

 

When looking = at the SOD line with digital scope (logic) there are framing errors on = every byte transmitted with the terminal set to 2400 = baud.

 

After reviewing the bit timing on the scope, 1 bit = time is 0.531 ms which is 1/0.531ms =3D 1883 baud. And I now have a = signon message =E2=80=9CSDK-85+  VER 2.1=E2=80=9D. Not sure where = that came from, but I will continue to review the code and the hardware = to see where that is. I suspected a baud rate issue to start, but had to = get smart enough to check the bit timing on the scope to prove my = idea.

 

Also, I wanted to let you know that I reworked the = SDK85 eprom programmer that I previously sent you the link to, so that I = would plug into J8 on the SDK85+ board. The files should be ready for = the fab shop in a few days. It will now plug into the original SDK85 and = also the SDK85+ boards directly without i/o map changes. =

 

Regards,

 

George

 

 

From: SBC-85 <craig@sbc-85.com> =
Sent: Monday, June 10, 2024 11:08 AM
To: adamsgl@cinci.rr.com
Subje= ct: Re: SDK85+ Debug

 

Hi = George

 

I = was just going to ask if the boards and keycaps arrived = okay.

 

Are there other signs of life?  Is the display = showing anything or are you just trying the serial = first?

 

What firmware are you using? Including version? I = think I brought the SDK-85+ firmware up to 9600 but would need to look = at the code.

 

I = see your installed IC list, I will need to look at the schematic. As = long as the 8085 can fetch instructions and has RAM, the SOD should work = properly.  I would take out the MAX and just look at the TTL signal = on SOD until you get it going correctly.






On Jun 9, 2024, at 6:09=E2=80=AFPM, adamsgl@cinci.rr.com = wrote:

=EF=BB=BF

=

Hi Craig,

 

I have = assembled the SDK-85 and could use a little help, as I am somewhat out = of ideas.

 

The problem I am having is the serial output from the = board is scrambled. When looking at it with a digital scope, on the 8085 = SDO pin, there are framing errors.

 

The = processor clock is correct at 6.144 Mhz, and the processor runs and = appears to access the 8755 correctly. (especially since there is serial = output)

 

Also tested with the max232 removed with the digital = scope on the 8085 with the same results.

 

The Max232 = has the correct voltages on pin 2 (9.6v) and pin 6 = (-9.8).

 

I have U1, U2, U3, U6, U7, U13  and U14 = installed, all other ic=E2=80=99s are not installed. JP1 = (1-2).

 

All the chips have been swapped with those on my = STD-85 board with no change. Except for the 8755 and I have tried = others.

 

Usually this is a timing issue, baud rate setting = (2400) (the numbers for the serial timing in the code are the same as = the STD85, so I=E2=80=99m guessing this is also 2400).

Tried other baud rates on the terminal with no = luck.

 

Any ideas where to look would be = appreciated.

 

Thanks Again,

 

George

 

V= irus-free.www.avast.com

 

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