Re: 8085 IO ports

On 21/01/2017 21:39, "Tony Duell" wrote: >> I don't think I'll touch them, they're obviously part of the phone subsystem >> and I doubt I'll ever plug it into a phone line - I have several One Per >> Desks for that sort of thing if needs be. > > A telephone line similator is a useful toy to have

Re: 8085 IO ports

On 21/01/2017 21:39, "Tony Duell" wrote: >>> sequence of locations that the CPU is reading. Most (but not all) will be >>> instructions. Find one, compare with the listing, see if the sequence makes >>> sense. >> >> I can trigger it on the RD signal yes. There's 2 LS373s which both had dead > >

Re: 8085 IO ports

On Sat, Jan 21, 2017 at 4:27 PM, Adrian Graham wrote: > Back to the Executel after a few days relaxing :) > > On 17/01/2017 20:59, "Tony Duell" wrote: > >>> Yep, on the left two. I haven't dared to pull them from the board though >>> even though they're socketed. >> >> Do be careful, the substrat

Re: 8085 IO ports

70 "LUCY" chip which I guess I can't easily test or even source a known working spare if it turns out to be faulty :/ Cheers > > From: cctalk on behalf of Adrian Graham > > Sent: Saturday, January 21, 2017 8:27:06 AM > To: Gener

Re: 8085 IO ports

shaking when the processor is asking for data from the modem. Just a though. Dwight From: cctalk on behalf of Adrian Graham Sent: Saturday, January 21, 2017 8:27:06 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: 8085 IO ports Back to

Re: 8085 IO ports

Back to the Executel after a few days relaxing :) On 17/01/2017 20:59, "Tony Duell" wrote: >> Yep, on the left two. I haven't dared to pull them from the board though >> even though they're socketed. > > Do be careful, the substrate is a brittle ceramic material... I don't think I'll touch the

Re: 8085 IO ports

On 19/01/2017 15:47, "Tony Duell" wrote: > On Wed, Jan 18, 2017 at 11:42 PM, Adrian Graham > wrote: >> On 18 January 2017 at 20:13, Tony Duell wrote: >> >>> >>> Just to keep you updated, I have located one of my units that contains said >>> drive. I am rather busy at the moment with more mund

Re: 8085 IO ports

On Wed, Jan 18, 2017 at 11:42 PM, Adrian Graham wrote: > On 18 January 2017 at 20:13, Tony Duell wrote: > >> >> Just to keep you updated, I have located one of my units that contains said >> drive. I am rather busy at the moment with more mundane things, but I will >> try to pull it apart and ide

Re: 8085 IO ports

On Wed, Jan 18, 2017 at 11:42 PM, Adrian Graham wrote: > On 18 January 2017 at 20:13, Tony Duell wrote: > >> >> Just to keep you updated, I have located one of my units that contains said >> drive. I am rather busy at the moment with more mundane things, but I will >> try to pull it apart and ide

Re: 8085 IO ports

On 18 January 2017 at 20:13, Tony Duell wrote: > > Just to keep you updated, I have located one of my units that contains said > drive. I am rather busy at the moment with more mundane things, but I will > try to pull it apart and identify said capacitors. Thanks Tony :) -- adrian/witchy Own

Re: 8085 IO ports

On Tue, Jan 17, 2017 at 8:59 PM, Tony Duell wrote: > On Tue, Jan 17, 2017 at 7:15 PM, Adrian Graham > wrote: >>> What is the tape drive? That board has a distinct look of Philips about it. >>> What tapes does it use? If I were a gambling man I would guess at Phlips >>> minicassettes (not microca

Re: 8085 IO ports

On Tue, Jan 17, 2017 at 7:15 PM, Adrian Graham wrote: > On 17/01/2017 16:53, "Tony Duell" wrote: > >> Z80, PDP8, P850, etc) you have special I/O instructions accessing I/O >> devices. >> The address spaces are totally separate, I/O location 0 has nothing to do >> with >> memory location 0. On t

Re: 8085 IO ports

On 17/01/2017 18:22, "allison" wrote: >> The transport motors move fine but the head unit itself is badly rusted >> around the edges. I also don't know what capacitance the ex-caps are since >> they're that badly damaged but that's info I can hopefully get from the >> other unit since that one is

Re: 8085 IO ports

On 17/01/2017 16:53, "Tony Duell" wrote: > Z80, PDP8, P850, etc) you have special I/O instructions accessing I/O devices. > The address spaces are totally separate, I/O location 0 has nothing to do with > memory location 0. On the 8085, an I/O instructon (IN or OUT) will cause > IO/M to be assert

Re: 8085 IO ports

> On Jan 17, 2017, at 1:22 PM, allison wrote: > > On 1/17/17 11:38 AM, Adrian Graham wrote: >> On 17 January 2017 at 02:14, allison wrote: >> >>> ... >>> >> The transport motors move fine but the head unit itself is badly rusted >> around the edges. I also don't know what capacitance the ex-c

Re: 8085 IO ports

On 1/17/17 11:38 AM, Adrian Graham wrote: On 17 January 2017 at 02:14, allison wrote: snippage> That's the later 1983 version but its the book you want. Thanks, that was some light reading o

Re: 8085 IO ports

On Tue, Jan 17, 2017 at 1:15 AM, Adrian Graham wrote: > On 15/01/2017 14:38, "Tony Duell" wrote: > >> But do you know it''s not doing I/O. OK IO/M is never going into the >> right state for >> I/O, but what that _really_ means is that the 8085 is never executing >> any IN or OUT >> type instructi

Re: 8085 IO ports

On 17 January 2017 at 02:14, allison wrote: > > > > That's the later 1983 version but its the book you want. > Thanks, that was some light reading over lunchtime. The descriptions of the interfacing he

Re: 8085 IO ports

On 01/16/2017 08:37 PM, Adrian Graham wrote: > On 15/01/2017 16:59, "allison" wrote: > >>> I've thought of that which is why I'm chasing down details on the Viewdata >>> chip and the D8741A which I assume is being used as a keyboard controller. >>> There are also 3 modules on the phone side which

Re: 8085 IO ports

On 15/01/2017 16:59, "allison" wrote: >> I've thought of that which is why I'm chasing down details on the Viewdata >> chip and the D8741A which I assume is being used as a keyboard controller. >> There are also 3 modules on the phone side which I can't find anything >> about, marked "NKT NMC1515

Re: 8085 IO ports

On 15/01/2017 14:38, "Tony Duell" wrote: > But do you know it''s not doing I/O. OK IO/M is never going into the > right state for > I/O, but what that _really_ means is that the 8085 is never executing > any IN or OUT > type instructions. But of course memory mapped I/O is possible > (storing or

Re: 8085 IO ports

On 01/15/2017 01:06 PM, Chuck Guzis wrote: > On 01/15/2017 09:37 AM, Glen Slick wrote: > > >> In the EPROM binary dump you posted I see code that is doing IN and >> OUT accesses to the following port locations... > I've seen that technique used to address a device, such as off-chip > EEPROM--basica

Re: 8085 IO ports

On 01/15/2017 08:02 AM, Adrian Graham wrote: > On 15/01/2017 03:04, "allison" wrote: > >> On 01/14/2017 08:18 PM, dwight wrote: >>> If it is not doing I/O and waiting for something, it is likely waiting for >>> an >>> interrupt. >>> >>> Dwight > > Apologies for all the daft sounding questions (th

Re: 8085 IO ports

On 01/15/2017 09:37 AM, Glen Slick wrote: > In the EPROM binary dump you posted I see code that is doing IN and > OUT accesses to the following port locations... I've seen that technique used to address a device, such as off-chip EEPROM--basically, rather than employ a separate latch for the add

Re: 8085 IO ports

On Sat, Jan 14, 2017 at 12:01 PM, Adrian Graham wrote: > Hi folks, > > STC Executel fun continues and I'm at the point where I'm fairly sure code > is running but it's stuck in a tight loop waiting for something to happen. > > The 8085A reference tells me a non-memory I/O is signalled by IO/M goin

Re: 8085 IO ports

On Sun, Jan 15, 2017 at 1:02 PM, Adrian Graham wrote: > On 15/01/2017 03:04, "allison" wrote: > >> On 01/14/2017 08:18 PM, dwight wrote: >>> If it is not doing I/O and waiting for something, it is likely waiting for >>> an >>> interrupt. >>> >>> Dwight But do you know it''s not doing I/O. OK IO

Re: 8085 IO ports

On 15/01/2017 03:04, "allison" wrote: > On 01/14/2017 08:18 PM, dwight wrote: >> If it is not doing I/O and waiting for something, it is likely waiting for an >> interrupt. >> >> Dwight Apologies for all the daft sounding questions (this goes to Dwight, Tony and Chuck too) but historically I'm

Re: 8085 IO ports

:01:32 PM > To: Discussion: On-Topic and Off-Topic Posts > Subject: 8085 IO ports > > Hi folks, > > STC Executel fun continues and I'm at the point where I'm fairly sure code > is running but it's stuck in a tight loop waiting for something to happen. And maybe w

Re: 8085 IO ports

If it is not doing I/O and waiting for something, it is likely waiting for an interrupt. Dwight From: cctalk on behalf of Adrian Graham Sent: Saturday, January 14, 2017 12:01:32 PM To: Discussion: On-Topic and Off-Topic Posts Subject: 8085 IO ports Hi folks

Re: 8085 IO ports

perly timed? Dwight From: cctalk on behalf of Adrian Graham Sent: Saturday, January 14, 2017 12:01:32 PM To: Discussion: On-Topic and Off-Topic Posts Subject: 8085 IO ports Hi folks, STC Executel fun continues and I'm at the point where I'm fair

8085 IO ports

Hi folks, STC Executel fun continues and I'm at the point where I'm fairly sure code is running but it's stuck in a tight loop waiting for something to happen. The 8085A reference tells me a non-memory I/O is signalled by IO/M going high while it puts the port number on the address bus (0xE3 to 0