[vcf-midatlantic] Working Tandy 1000 or 2000

[Dean Notarnicola]

I just picked up an SX.  I'll check it in the morning

On Wed, Aug 29, 2018 at 11:13 PM Jonathan Gevaryahu via vcf-midatlantic <
vcf-midatlantic at lists.vcfed.org> wrote:

> The problem is I've found that the parts lists in some of the Tandy
> manuals is incorrect.
>
> On 8/29/2018 10:11 PM, Kelly Leavitt wrote:
> >
> > OK, sorry I got that backward. I have an SX apart on the bench for
> > some testing. I cannot find any chip with either part number. It is
> > either hiding under a Tandy house number or part of the 2 big (for the
> > time) ASICs. I'm pulling up the technical reference manual now.
> >
> >
> > OK, according to the parts list on P51, U37A is an SN76496 Tone
> > Generator. That agrees with page 7 of the schematic.
> >
> >
> > I've attached screen grabs of these if they don't get stripped.
> >
> >
> > You can find the tech ref for the 1000sx at
> >
> ftp://ftp.mindcandydvd.com/pub/drivers/Tandy/Tandy_1000SX_Technical_Reference_Manual.pdf
> >
> >
> > I'll verify the part number of IC U37A tomorrow.
> >
> >
> >
> > ------------------------------------------------------------------------
> > *From:* Jonathan Gevaryahu <jgevaryahu at gmail.com>
> > *Sent:* Wednesday, August 29, 2018 9:18 PM
> > *To:* Kelly Leavitt; vcf-midatlantic
> > *Subject:* Re: [vcf-midatlantic] Working Tandy 1000 or 2000
> > The TI chip is fairly well understood; the original Tandy 1000/1000HD,
> > and the slightly enhanced 1000A used the 'real' TI chip, SN76496, for
> > certain.
> > Its possible that the EX (and maybe HX?) also used it, but unclear.
> >
> > The SX and TX (and maybe the HX?) SUPPOSEDLY used the weird NCR8496
> > chip, which is what I need tested. (assuming wikipedia is correct,
> > which it actually isn't regarding the SN76496 on the Tandy 1000/1000A...)
> > The SL2, TL2, RLX, RSX use the PSSJ-3 ASIC, which would also be ok for
> > testing, but ideally I'd like to run these tests on both the NCR8496
> > and the PSSJ-3.
> >
> >
> > On 8/29/2018 8:36 AM, Kelly Leavitt wrote:
> >>
> >> I have manyof the 1000 series computers (hx, ex, sx, sl, sl2, tl,
> >> etc). Do you know which used the wonky TI chip? I can always start
> >> opening them up.
> >>
> >>
> >>
> >> ------------------------------------------------------------------------
> >> *From:* Jonathan Gevaryahu <jgevaryahu at gmail.com>
> >> <mailto:jgevaryahu at gmail.com>
> >> *Sent:* Wednesday, August 29, 2018 12:55 AM
> >> *To:* Kelly Leavitt; vcf-midatlantic
> >> *Subject:* Re: [vcf-midatlantic] Working Tandy 1000 or 2000
> >> Another thing: I need to test against a tandy 1000-series with an
> >> NCR8496 or PSSJ-1 asic in it, i.e. not the original tandy
> >> 1000/1000a/1000hd, since they actually use a real TI SN76496 PSG
> >> which actually behaves differently! (that's the whole reason I need
> >> to do these tests, the behavior isn't consistent!)
> >>
> >>
> >> On 8/29/2018 12:53 AM, Jonathan Gevaryahu wrote:
> >>> Indeed, I was thinking of the 1000 series, not the 2000.
> >>> I'm trying to figure the best way to run the tests from basic, i
> >>> might need to mess around with dosbox to get the program written,
> >>> since MAME has keyboard issues with the tandy machines (which I'd
> >>> also love to fix...)
> >>>
> >>>
> >>>
> >>> On 8/28/2018 8:45 PM, Kelly Leavitt wrote:
> >>>>
> >>>> The 2000 and the 1000 were remarkably different beasts. The 2000
> >>>> had a basic speaker that did beeps. There was a rumored TV board
> >>>> but I have never seen one in the wild. Fun tidbit, the 2000 loaded
> >>>> BIOS from floppy (a 720k 5.25 inch floppy). The built in ROM was a
> >>>> simple boot loader.
> >>>>
> >>>>
> >>>> The 1000 was mostly compatible with the XT/jr with some added sound
> >>>> and graphics capabilities.
> >>>>
> >>>>
> >>>> I have working models of the 1000 hear that I cant test with
> >>>> Tandy's Basica if you'd like. My 2000's are iffy so I can't make
> >>>> any promises. Send me the pokes you'd like to try.
> >>>>
> >>>>
> >>>> Kelly
> >>>>
> >>>> kelly at catcorner.org <mailto:kelly at catcorner.org>
> >>>>
> >>>>
> >>>>
> >>>>
> ------------------------------------------------------------------------
> >>>> *From:* vcf-midatlantic <vcf-midatlantic-bounces at lists.vcfed.org>
> >>>> <mailto:vcf-midatlantic-bounces at lists.vcfed.org> on behalf of
> >>>> Jonathan Gevaryahu via vcf-midatlantic
> >>>> <vcf-midatlantic at lists.vcfed.org>
> >>>> <mailto:vcf-midatlantic at lists.vcfed.org>
> >>>> *Sent:* Sunday, August 26, 2018 5:16 AM
> >>>> *To:* vcf-midatlantic at lists.vcfed.org
> >>>> <mailto:vcf-midatlantic at lists.vcfed.org>
> >>>> *Cc:* Jonathan Gevaryahu
> >>>> *Subject:* [vcf-midatlantic] Working Tandy 1000 or 2000
> >>>> Does VCF have a working Tandy 1000 or 2000 on display or in the
> >>>> warehouse?
> >>>>
> >>>> I need someone with access to a working Tandy 1000/2000 to do some
> >>>> poking from basic of the sound chip, since there's an issue I'm
> >>>> running
> >>>> into with a possible incompatibility of the Tandy 1000/2000 NCR8496
> >>>> PSG
> >>>> (sound chip) and the more common SN76489/SN76496 PSG which the
> >>>> colecovision etc used.
> >>>>
> >>>> --
> >>>> Jonathan Gevaryahu
> >>>> jgevaryahu at gmail.com <mailto:jgevaryahu at gmail.com>
> >>>> jgevaryahu at hotmail.com <mailto:jgevaryahu at hotmail.com>
> >>>>
> >>>
> >>> --
> >>> Jonathan Gevaryahu
> >>> jgevaryahu at gmail.com  <mailto:jgevaryahu at gmail.com>
> >>> jgevaryahu at hotmail.com  <mailto:jgevaryahu at hotmail.com>
> >>
> >>
> >> --
> >> Jonathan Gevaryahu
> >> jgevaryahu at gmail.com  <mailto:jgevaryahu at gmail.com>
> >> jgevaryahu at hotmail.com  <mailto:jgevaryahu at hotmail.com>
> >
> >
> > --
> > Jonathan Gevaryahu
> > jgevaryahu at gmail.com  <mailto:jgevaryahu at gmail.com>
> > jgevaryahu at hotmail.com  <mailto:jgevaryahu at hotmail.com>
>
>
> --
> Jonathan Gevaryahu
> jgevaryahu at gmail.com
> jgevaryahu at hotmail.com
>
>