[vcf-midatlantic] Working Tandy 1000 or 2000

Jonathan Gevaryahu jgevaryahu at gmail.com
Wed Aug 29 21:18:01 EDT 2018


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>
> *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
jgevaryahu at hotmail.com



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