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
------------------------------------------------------------------------ *From:* vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> on behalf of Jonathan Gevaryahu via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> *Sent:* Sunday, August 26, 2018 5:16 AM *To:* 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 jgevaryahu@hotmail.com
-- Jonathan Gevaryahu jgevaryahu@gmail.com jgevaryahu@hotmail.com
-- Jonathan Gevaryahu jgevaryahu@gmail.com jgevaryahu@hotmail.com