Re: Mystery 8085-related IC identification needed please

2018-07-25 Thread alemoco4--- via cctalk
Hi Are you still looking to purchase STC executel, I have just found my old one in the cupboard under my bed and could sell. Please email me if interested Regards Peter Sent from my iPhone

Re: Mystery 8085-related IC identification needed please

2016-12-22 Thread Adrian Graham
On 21/12/2016 19:37, "Brent Hilpert" wrote: > On 2016-Dec-17, at 10:34 AM, Adrian Graham wrote: >> One problem I have is that I've already found a few chips with dead outputs >> so I've no idea if these will be any different. The pinouts I have match the >> LS92 since pins

Re: Mystery 8085-related IC identification needed please

2016-12-21 Thread Brent Hilpert
On 2016-Dec-21, at 11:44 AM, Tony Duell wrote: > On Wed, Dec 21, 2016 at 7:37 PM, Brent Hilpert wrote: > >> The counters may be the beginning of a video timing divider chain or a clock >> divider for the LUCY chip. >> (e.g. a diagram in the document you mentioned shows a

Re: Mystery 8085-related IC identification needed please

2016-12-21 Thread Tony Duell
On Wed, Dec 21, 2016 at 7:37 PM, Brent Hilpert wrote: > The counters may be the beginning of a video timing divider chain or a clock > divider for the LUCY chip. > (e.g. a diagram in the document you mentioned shows a div-6 between a 6MHz > crystal osc and the LUCY chip. >

Re: Mystery 8085-related IC identification needed please

2016-12-21 Thread Brent Hilpert
On 2016-Dec-16, at 5:43 AM, Adrian Graham wrote: > viewdata side of things is powered by a Plessey MR9735-002 teletext > processor supported by a pair of 2112 RAM chips and an SAA5070 "LUCY". > > http://txlib.mb21.co.uk/main.php?g2_view=core.DownloadItem_itemId=2034 On 2016-Dec-17, at 10:34 AM,

Re: Mystery 8085-related IC identification needed please

2016-12-18 Thread Adrian Graham
On 17/12/2016 18:49, "Tony Duell" wrote: >>> What value resistor? >> >> It's a 5-band red-red-black-black-violet so either 220R or 70k? Based on >> what Pete said about the Z80 I'm going for 220R without pulling it out of >> circuit. >> > > Yes. I would agree with that.

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread Tony Duell
On Sat, Dec 17, 2016 at 6:34 PM, Adrian Graham wrote: > On 17/12/2016 14:28, "Tony Duell" wrote: > >> On Sat, Dec 17, 2016 at 2:02 PM, Adrian Graham >> wrote: >>> >> >>> >>> Thanks all, the pinouts are matching

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread dwight
10:34:01 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Mystery 8085-related IC identification needed please On 17/12/2016 14:28, "Tony Duell" <ard.p850...@gmail.com> wrote: > On Sat, Dec 17, 2016 at 2:02 PM, Adrian Graham > <wit...@binarydinosaur

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread Adrian Graham
On 17/12/2016 14:28, "Tony Duell" wrote: > On Sat, Dec 17, 2016 at 2:02 PM, Adrian Graham > wrote: >> > >> >> Thanks all, the pinouts are matching the LS9x counters so I just need to >> trace more lines to hopefully narrow it down. Pins 6

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread Pete Turnbull
On 17/12/2016 14:28, Tony Duell wrote: On Sat, Dec 17, 2016 at 2:02 PM, Adrian Graham wrote: Thanks all, the pinouts are matching the LS9x counters so I just need to trace more lines to hopefully narrow it down. Pins 6 and 7 are definitely inputs so you're right

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread Tony Duell
On Sat, Dec 17, 2016 at 2:02 PM, Adrian Graham wrote: > > > Thanks all, the pinouts are matching the LS9x counters so I just need to > trace more lines to hopefully narrow it down. Pins 6 and 7 are definitely > inputs so you're right Tony, the reset must come from

Re: Mystery 8085-related IC identification needed please

2016-12-17 Thread Adrian Graham
On 16/12/2016 18:25, "Tony Duell" wrote: > On Fri, Dec 16, 2016 at 6:19 PM, Peter Coghlan > wrote: >>> >>> They aren't 'standard' 14-pin DIPs in that they don't follow the >>> GND-on-pin-7-Vcc-on-pin-14 layout. Pins 6 and 7 on both are wired

Re: Mystery 8085-related IC identification needed please

2016-12-16 Thread allison
On 12/16/2016 08:43 AM, Adrian Graham wrote: > Hi folks, > > I have an 8085-based viewdata telephone system on the bench that's proving > to be a labour of love in trying to get it running with zero documentation - > there are only 6 known examples that I've come across and all but 2 of them > are

Re: Mystery 8085-related IC identification needed please

2016-12-16 Thread Tony Duell
On Fri, Dec 16, 2016 at 6:19 PM, Peter Coghlan wrote: >> >> They aren't 'standard' 14-pin DIPs in that they don't follow the >> GND-on-pin-7-Vcc-on-pin-14 layout. Pins 6 and 7 on both are wired together >> (not to GND) and form the RESET signal for the 8085 via the 7414

Re: Mystery 8085-related IC identification needed please

2016-12-16 Thread Peter Coghlan
> > They aren't 'standard' 14-pin DIPs in that they don't follow the > GND-on-pin-7-Vcc-on-pin-14 layout. Pins 6 and 7 on both are wired together > (not to GND) and form the RESET signal for the 8085 via the 7414 at 10A, > source for this signal is unknown currently. Pin 5 on both appears to be

Re: Mystery 8085-related IC identification needed please

2016-12-16 Thread Vincent Slyngstad
From: Adrian Graham: Friday, December 16, 2016 5:43 AM They aren't 'standard' 14-pin DIPs in that they don't follow the GND-on-pin-7-Vcc-on-pin-14 layout. Pins 6 and 7 on both are wired together (not to GND) and form the RESET signal for the 8085 via the 7414 at 10A, source for this signal is

Mystery 8085-related IC identification needed please

2016-12-16 Thread Adrian Graham
Hi folks, I have an 8085-based viewdata telephone system on the bench that's proving to be a labour of love in trying to get it running with zero documentation - there are only 6 known examples that I've come across and all but 2 of them are in museums, none known to work. If any of you fancy