Oh how I wished I'd bought up the stock when I saw them
(C;
Wanted: ULA or 2
Re: Wanted: ULA or 2
I've got a spare (working) Issue One board with a 2C184E if it's of any use? All ICs socketed Think I have the case too but it was heat damaged from what I recall, and don't think keyboard worked.
I may have another spare ZX81 too. Let me know.
Cheers,
Chad
I may have another spare ZX81 too. Let me know.
Cheers,
Chad
Re: Wanted: ULA or 2
It's the later ULA I wanted - I have working boards but no way to display them
The picture is just about viewable on an old composite monitor I have here but no TV will work with them.
Thanks!
C
The picture is just about viewable on an old composite monitor I have here but no TV will work with them.
Thanks!
C
Re: Wanted: ULA or 2
I'm not convinced on the whole old ULA = dark/ new ULA = bright picture thing. I've got a 2C184 in one of my machines which gives me a cracking picture via composite video on both a CRT and LCD TV. Then I can swap in a 2C184 from another machine and the picture's almost black.
There's always the back porch mod using an LM1881 described in these forums somewhere. Wasn't there also a plug-in replacement engineered on an FPGA?
Regards,
Chad
There's always the back porch mod using an LM1881 described in these forums somewhere. Wasn't there also a plug-in replacement engineered on an FPGA?
Regards,
Chad
Re: Wanted: ULA or 2
Please describe the ULA chip or chips to me as they apply to each of the Sinclair family of machines, Timex included please. I am looking at a chip that has (c)Sinclair 1982 above (c)Timex 1983 with numbers-8334A 812200..some 201's..most are regular chip material , but one has a porcelin base and a gold square in the middle with..M8331 812200 same Sinclair above timex writing. Are these ULA chips? There are some that are square with little gold contacts on all 4 sides of the chip, the writing saysTimex 1500 PT 609-0380485 f707715 usa. the base looks whit, I assume porcelin. most are black square chip with f807207 usa. I seeTimex 2000 PT 609-0380784 f707892 usa , some NCRf808979 8345d Is this a ULA from the Timex 2068 of Portugal? Thanks in advance, I am trying to identify some chips.
Re: Wanted: ULA or 2
Hi Neil.
ULAs are 40 pin plastic packages - there's a thread elsewhere dealing with the identifying numbers.
The other chips you have don't sound like anything you'd find inside a ZX81/TS1000.
Could you please snap some pictures?
THanks!
C
ULAs are 40 pin plastic packages - there's a thread elsewhere dealing with the identifying numbers.
The other chips you have don't sound like anything you'd find inside a ZX81/TS1000.
Could you please snap some pictures?
THanks!
C
Re: Wanted: ULA or 2
Although there is still no replacement ULA readily available, we have of course, now released ZXvid, which provides composite video out and also fixes the back porch problem ! See viewtopic.php?t=628Chad wrote:I'm not convinced on the whole old ULA = dark/ new ULA = bright picture thing. I've got a 2C184 in one of my machines which gives me a cracking picture via composite video on both a CRT and LCD TV. Then I can swap in a 2C184 from another machine and the picture's almost black.
There's always the back porch mod using an LM1881 described in these forums somewhere. Wasn't there also a plug-in replacement engineered on an FPGA?
Regards,
Chad
Rich Mellor
RWAP Software
RWAP Adventures
SellMyRetro
Retro-Printer Module
Also Involved in:
Icephorm
RWAP Software
RWAP Adventures
SellMyRetro
Retro-Printer Module
Also Involved in:
Icephorm