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Hermes SMTP Server) with ESMTPA ID 65392c217d8e2b10fdbb5c85d467cf2e; Thu, 30 Jun 2022 09:08:56 +0000 (UTC) From: James McCoull Content-Type: multipart/alternative; boundary="Apple-Mail=_7D86FB6E-0F66-403F-9C17-DA92BB364730" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.21\)) Subject: Re: SBC-85 boards Date: Thu, 30 Jun 2022 19:08:49 +1000 References: To: SBC-85 In-Reply-To: Message-Id: <86ABDEA4-421A-4F9B-891E-585492568FCB@yahoo.com> X-Mailer: Apple Mail (2.3445.104.21) Content-Length: 14172 X-Spam-Status: No, score=-0.2 X-Spam-Score: -1 X-Spam-Bar: / X-Spam-Flag: NO --Apple-Mail=_7D86FB6E-0F66-403F-9C17-DA92BB364730 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Craig, I went to grab the BOM files from sbc-85.com , but = it looks like the site is playing up. (I know this is probably the last thing you want to hear). Just thought I would inform you. Cheers James. > On 20 Jun 2022, at 5:47 pm, SBC-85 wrote: >=20 > These arrive ok? >=20 > Regards > C >=20 >> On Jun 9, 2022, at 1:43 PM, SBC-85 wrote: >>=20 >> =EF=BB=BF >> Hi James >>=20 >> Did you see I added the tracking number? It looks like it has arrived = in LA and now waiting to catch a flight headed west. =20 >>=20 >>> On Jun 4, 2022, at 4:50 PM, James McCoull = wrote: >>>=20 >>> =EF=BB=BFHi Craig, >>>=20 >>> Yes. I forgot the jig. I thought I had ordered it but must have = forgotten. >>>=20 >>> For the EPROM I was thinking I'lll probably run emulate EPROM via = SRAM for initial bring up and testing whilst I resolve the programming = voltage issue. >>>=20 >>> I saw your ZIF trick (https://youtu.be/MvzTYd76yM4?t=3D234 = ), terrific stuff. I=E2=80=99ve = generally been using http://www.cnctech.us/pdfs/220-1-XX-00X_.pdf = etc and make small = adaptor boards. I must try the ZIF+header trick. >>> Of course my next challenge is to source the 38P70 and other = components. >>>=20 >>> This is my first time with F8. I wasn=E2=80=99t even aware of it = until watching your great videos. I was learning about micros mainly in = the mid 80s onwards, so there is a whole range of products from the 70s = that is new to me. >>> Only just discovered the RCA1802 a few months back, and now the F8. = Its great fun learning about these. >>>=20 >>> Regards, >>> James. >>>=20 >>>> On 4 Jun 2022, at 4:59 pm, SBC-85 > wrote: >>>>=20 >>>> Hi James, >>>>=20 >>>> The original tl866 can do 25v I think, but later versions lost that = ability. my tl866 is a later version and only goes up to 15V or = something, so I use my William for 2716s . Someone commented once that = you could use pull-ups to 21V on the newer version to help it along with = the 2716A. But I have no reason, incentive, or desire to test their = suggestion. >>>>=20 >>>> I think the 2716As are mostly 21V devices which WAS the improvement = from the 2716 which was 25Vpp. I am pretty sure I have only been = running 2716A eproms on my F8 board. I only assume that because my = programmer is set to 21V and the eproms are taking a program ok. Many = of my eproms are unreadable marking on top and almost none have Vpp = written on them. If I can=E2=80=99t read the EPROM markings, I try = programming at increasing voltages until I get to 25Vpp. Either it = starts programming or it never takes. If it programs, I label it with = the memory size and Vpp , otherwise it goes into my scrap chip bin for = someone else to wonder about after I am dead. >>>>=20 >>>> Most of the memory manufacturers seemed to skip making an A version = of the 2716 since by the time the 21Vpp A version came out the 2732 was = cheaper. So many went right from the 2716 to the 2732A and never went = back to make the 2716A. I am not sure if intel or Mostek even made a = 2716A did they? >>>>=20 >>>> It is purely for convenience, but the LED alignment jig for the bus = monitor is handy. I don=E2=80=99t remember seeing one in your order but = I just glanced at it so may have missed it. >>>>=20 >>>> Several dollars for a pre programmed eprom, but that is a last = resort since you will need to have a 2716 programmer sooner or later. = My clock code is still very rough and I am back on the STD-85 board for = the next few weeks, so it will be a while before I get back to the F8 = code. I will start posting source files on the SBC-85 site as I get it = in better shape. >>>>=20 >>>> The SBC-85 is a load of fun, and programming the F8 board made me = appreciate the 8085 even more. Are you an old F8 guru or is the 3870 = your first entry into the F8? >>>>=20 >>>> Regards >>>>=20 >>>> Craig >>>>=20 >>>>=20 >>>>> On Jun 3, 2022, at 10:33 PM, James McCoull > wrote: >>>>>=20 >>>>> =EF=BB=BFHi Craig, >>>>>=20 >>>>> That was a quick reply! >>>>>=20 >>>>> Good point, I only have a TL866 programmer handy, so I=E2=80=99m = probably limited to 21V or less. >>>>> Will 2716A=E2=80=99s work with the F8? (I think they can be = programmed with 12.5V). >>>>>=20 >>>>> Not got any parts handy for the F8 board - I was going to file it = away for a rainy day project. >>>>> Whats the price on a 2716 pre-programmed? >>>>>=20 >>>>> Regards, >>>>> James. >>>>>=20 >>>>>> On 4 Jun 2022, at 2:16 pm, SBC-85 > wrote: >>>>>>=20 >>>>>> Hi James, >>>>>>=20 >>>>>> Thanks for your order of SBC-85 boards. I will get these sent = out in the next day or two. >>>>>>=20 >>>>>> For the F8 board, I wanted to make sure you can program 2716 = eproms. If not, I can send one with the current (but rough) clock code = so you have something to run right out of the gate. >>>>>>=20 >>>>>> Let me know if you need anything else. Also, please let me know = if you find anything wrong or missing from an6 of the documentation. >>>>>>=20 >>>>>> Regards >>>>>>=20 >>>>>> Craig >>>>>=20 >>>>=20 >>>=20 --Apple-Mail=_7D86FB6E-0F66-403F-9C17-DA92BB364730 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Hi = Craig,

I went to = grab the BOM files from sbc-85.com, but it looks like the site is playing = up.
(I know this is probably the last thing you = want to hear).

Just thought I would inform you.

Cheers
James.


On 20 = Jun 2022, at 5:47 pm, SBC-85 <craig@sbc-85.com> wrote:

These arrive ok?

Regards
C

On Jun 9, 2022, at 1:43 PM, SBC-85 <craig@sbc-85.com> = wrote:

=EF=BB=BF
Hi James

Did you see I added the = tracking number? It looks like it has arrived in LA and now waiting to = catch a flight headed west.  

On Jun 4, 2022, at 4:50 = PM, James McCoull <jmccoull@yahoo.com> wrote:

=EF=BB=BFHi Craig,

Yes. I forgot the jig. =  I thought I had ordered it but must have forgotten.

For the EPROM I was = thinking I'lll probably run emulate EPROM via SRAM for initial bring up = and testing whilst I resolve the programming voltage issue.

I saw your ZIF trick (https://youtu.be/MvzTYd76yM4?t=3D234), terrific stuff. =  I=E2=80=99ve generally been using http://www.cnctech.us/pdfs/220-1-XX-00X_.pdf etc and = make small adaptor boards.  I must try the ZIF+header = trick.
Of course my next challenge is to source the = 38P70 and other components.

This is my first time with F8.  I wasn=E2=80=99t even = aware of it until watching your great videos.  I was learning about = micros mainly in the mid 80s onwards, so there is a whole range of = products from the 70s that is new to me.
Only just = discovered the RCA1802 a few months back, and now the F8.  Its = great fun learning about these.

Regards,
James.

On 4 Jun 2022, at 4:59 pm, SBC-85 <craig@sbc-85.com> = wrote:

Hi James,

The original tl866 can = do 25v I think, but later versions lost that ability. my tl866 is a = later version and only goes up to 15V or something, so I use my William = for 2716s .   Someone commented once that you could use = pull-ups to 21V on the newer version to help it along with the 2716A. = But I have no reason, incentive, or desire to test their suggestion.

I think the 2716As are mostly 21V devices = which WAS the improvement from the 2716 which was 25Vpp.   I = am pretty sure I have only been running 2716A eproms on my F8 board. =  I only assume that because my programmer is set to 21V and the = eproms are taking a program ok.  Many of my eproms are unreadable = marking on top and almost none have Vpp written on them.  If I = can=E2=80=99t read the EPROM markings, I try programming at increasing = voltages until I get to 25Vpp. Either it starts programming or it never = takes.  If it programs, I label it with the memory size and Vpp , = otherwise it goes into my scrap chip bin for someone else to wonder = about after I am dead.

Most of the memory = manufacturers seemed to skip making an A version of the 2716 since by = the time the 21Vpp A version came out the 2732 was cheaper.  So = many went right from the 2716 to the 2732A and never went back to make = the 2716A.  I am not sure if intel or Mostek even made a 2716A did = they?

It is purely for convenience, but the = LED alignment jig for the bus monitor is handy.  I don=E2=80=99t = remember seeing one in your order but I just glanced at it so may have = missed it.

Several dollars for a pre = programmed eprom, but that is a last resort since you will need to have = a 2716 programmer sooner or later.  My clock code is still very = rough and I am back on the STD-85 board for the next few weeks, so it = will be a while before I get back to the F8 code.  I will start = posting source files on the SBC-85 site as I get it in better shape.

The SBC-85 is a load of fun, and programming = the F8 board made me appreciate the 8085 even more.  Are you an old = F8 guru or is the 3870 your first entry into the F8?

Regards

Craig


On Jun 3, = 2022, at 10:33 PM, James McCoull <jmccoull@yahoo.com> wrote:

=EF=BB=BFHi Craig,

That was a = quick reply!

Good point, I only have a = TL866 programmer handy, so I=E2=80=99m probably limited to 21V or = less.
Will 2716A=E2=80=99s work with the F8? (I think they = can be programmed with 12.5V).

Not got any = parts handy for the F8 board - I was going to file it away for a rainy = day project.
Whats the price on a 2716 pre-programmed?

Regards,
James.

On 4 Jun 2022, at 2:16 = pm, SBC-85 <craig@sbc-85.com> wrote:

Hi= James,

Thanks for your order of SBC-85 = boards.  I will get these sent out in the next day or two.

For the F8 board, I wanted to make sure you = can program 2716 eproms.  If not, I can send one with the current = (but rough) clock code so you have something to run right out of the = gate.

Let me know if you need anything = else.  Also, please let me know if you find anything wrong or = missing from an6 of the documentation.

Regards

Craig




= --Apple-Mail=_7D86FB6E-0F66-403F-9C17-DA92BB364730--