The 1000TX I've heard (but am not sure) uses an NCR8496, but again, just a rumor. On 8/30/2018 10:23 AM, Kelly Leavitt wrote:
Just confirmed, my 1000SX has the SN76496 TI chip. I'll have to look at the others in this family.
------------------------------------------------------------------------ *From:* Dean Notarnicola <dnotarnicola@gmail.com> *Sent:* Wednesday, August 29, 2018 11:48 PM *To:* vcf-midatlantic *Cc:* Jonathan Gevaryahu; Kelly Leavitt *Subject:* Re: [vcf-midatlantic] Working Tandy 1000 or 2000 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@lists.vcfed.org <mailto:vcf-midatlantic@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@gmail.com <mailto:jgevaryahu@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@gmail.com <mailto:jgevaryahu@gmail.com>> >> <mailto:jgevaryahu@gmail.com <mailto:jgevaryahu@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@catcorner.org <mailto:kelly@catcorner.org> <mailto:kelly@catcorner.org <mailto:kelly@catcorner.org>> >>>> >>>> >>>> >>>> ------------------------------------------------------------------------ >>>> *From:* vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org <mailto:vcf-midatlantic-bounces@lists.vcfed.org>> >>>> <mailto:vcf-midatlantic-bounces@lists.vcfed.org <mailto:vcf-midatlantic-bounces@lists.vcfed.org>> on behalf of >>>> Jonathan Gevaryahu via vcf-midatlantic >>>> <vcf-midatlantic@lists.vcfed.org <mailto:vcf-midatlantic@lists.vcfed.org>> >>>> <mailto:vcf-midatlantic@lists.vcfed.org <mailto:vcf-midatlantic@lists.vcfed.org>> >>>> *Sent:* Sunday, August 26, 2018 5:16 AM >>>> *To:* vcf-midatlantic@lists.vcfed.org <mailto:vcf-midatlantic@lists.vcfed.org> >>>> <mailto:vcf-midatlantic@lists.vcfed.org <mailto:vcf-midatlantic@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@gmail.com <mailto:jgevaryahu@gmail.com> <mailto:jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com>> >>>> jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com> <mailto:jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com>> >>>> >>> >>> -- >>> Jonathan Gevaryahu >>> jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com> <mailto:jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com>> >>> jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com> <mailto:jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com>> >> >> >> -- >> Jonathan Gevaryahu >> jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com> <mailto:jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com>> >> jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com> <mailto:jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com>> > > > -- > Jonathan Gevaryahu > jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com> <mailto:jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com>> > jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com> <mailto:jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com>>
-- Jonathan Gevaryahu jgevaryahu@gmail.com <mailto:jgevaryahu@gmail.com> jgevaryahu@hotmail.com <mailto:jgevaryahu@hotmail.com>
-- Jonathan Gevaryahu jgevaryahu@gmail.com jgevaryahu@hotmail.com