Re: 6502 code

2016-12-13 Thread Sean Conner
It was thus said that the Great drlegendre . once stated: > @Sean > > I was wondering the same, but perhaps he needs physical hardware for some > specific purposes, like timing and so forth? The 6502 (as well as many of the other 8-bit CPUs of that era) are deterministic to the point where publ

Re: 6502 code

2016-12-13 Thread Peter Coghlan
> Hi > > There has been so much PDP and other stuff lately I kind of feel out of place > asking about 6502 stuff. > > Anyway, I've mentioned on the 6502.org that QuickSort is not always the > fastest sort. So I wrote a 6502 assembly sort but don't have a machine big > enough to test it > > on. I've

Re: looking for keytronics keyboard pad replacement kit

2016-12-13 Thread Peter Cetinski
I haven't had the greatest success with the Mylar blankets on my Tandy 6000 keyboards. Some of the keys would act flaky and result in garbage characters on the screen. I had to replace those problematic keys with original discs. But, I rebuilt a Model II keyboard where the blanket discs work

Re: TOPS-20 Telnet and Port Forwading issue

2016-12-13 Thread Peter Coghlan
On Mon, 12 Dec 2016 23:10:57 -0700, Warner Losh wrote: > > On Mon, Dec 12, 2016 at 11:04 AM, Seth Morabito > wrote: > > Hi folks, > > > > I don't know if this is the best place to ask this question, but I don't > > know of any better forums for PDP-10 discussion, so hopefully it's > > on-topic eno

Re: looking for keytronics keyboard pad replacement kit

2016-12-13 Thread Santo Nucifora
I've had good luck with Apple Lisa's, Processor Technology Sol-20s, Dynalogic Hyperions and a TRS-80 model II keyboard. I make my own with weather stripping (sticky on one side), two sided tape and silver gift wrapping (mylar). I would re-use the original plastic disk (after cleaning them up) or

Re: 6502 code

2016-12-13 Thread Charles Anthony
On Mon, Dec 12, 2016 at 11:20 PM, Sean Conner wrote: > > If you have a modern system, you could always download a 6502 emulator > and > test it on that. Such a tactic wasn't even unheard of in the day---if I > recall correctly, that's how Gates & Co. tested their first BASIC---on an > emulated

Re: TOPS-20 Telnet and Port Forwading issue

2016-12-13 Thread Mouse
> Interestingly, when I telnet from _outside_ the network to my > firewall's port 2320, it works, but Telnet goes into line mode rather > than character mode! Probably, as I think someone said, telnet noticing it's not using the standard telnet port and not even trying to go character-at-a-time.

Re: looking for keytronics keyboard pad replacement kit

2016-12-13 Thread Ethan Dicks
On Tue, Dec 13, 2016 at 7:19 AM, Peter Cetinski wrote: > I haven't had the greatest success with the Mylar blankets on my Tandy 6000 > keyboards... I've heard of people using mylar balloons or mylar potato chip bags. I'm sure there are some analog effects that come into play and perhaps one type

Re: looking for keytronics keyboard pad replacement kit

2016-12-13 Thread william degnan
On Tue, Dec 13, 2016 at 11:24 AM, Ethan Dicks wrote: > On Tue, Dec 13, 2016 at 7:19 AM, Peter Cetinski wrote: > > I haven't had the greatest success with the Mylar blankets on my Tandy > 6000 keyboards... > > I've heard of people using mylar balloons or mylar potato chip bags. > I'm sure there a

Re: Megatek Series 7000 Graphics System?

2016-12-13 Thread Al Kossow
On 12/12/16 10:53 AM, Al Kossow wrote: > I also need to dig out the chassis to see what model number mine is. > None of the boards have Unibus connectors out the top. > > I also put up a couple of Megatek related documents and a product announcement > for the 7000 on bitsavers. > > I took ano

Re: TOPS-20 Telnet and Port Forwading issue

2016-12-13 Thread Peter Coghlan
> > > Interestingly, when I telnet from _outside_ the network to my > > firewall's port 2320, it works, but Telnet goes into line mode rather > > than character mode! > > Probably, as I think someone said, telnet noticing it's not using the > standard telnet port and not even trying to go character

Re: 6502 code

2016-12-13 Thread Fred Cisin
If you have a modern system, you could always download a 6502 emulator and test it on that. Such a tactic wasn't even unheard of in the day---if I recall correctly, that's how Gates & Co. tested their first BASIC---on an emulated 8080. On Tue, 13 Dec 2016, drlegendre . wrote: I was wonderi

Re: 6502 code

2016-12-13 Thread dwight
I'm not that much into learning how to use an emulator. I'll admit for something like this it might be fine but I find that most are not well written for things like I/O connections, timed events or random events. Sometimes that is needed. I have three volunteers so far. That should be fine.

Re: Megatek Series 7000 Graphics System?

2016-12-13 Thread Al Kossow
a product spec for the 7000 is up now on bitsavers. there are two busses, graphics and peripheral. On 12/13/16 9:07 AM, Al Kossow wrote: > I think that most of the backplane may just be bussed, with 16 bit adr and 32 > bit data. >

Re: TOPS-20 Telnet and Port Forwading issue

2016-12-13 Thread Eric Smith
It's the SGA (suppress go-ahead) negotiation that's necessary to avoid line mode. Many telnet clients don't try to negotiate any telnet options if you connect to a non-standard port, because they assume that you're talking to something other than a telnet server, and that you therefore want an 8-b

Re: TOPS-20 Telnet and Port Forwading issue

2016-12-13 Thread Peter Coghlan
> > It's the SGA (suppress go-ahead) negotiation that's necessary to avoid line > mode. > > Many telnet clients don't try to negotiate any telnet options if you > connect to a non-standard port, because they assume that you're talking to > something other than a telnet server, and that you therefor

Re: SGI Indigo Update

2016-12-13 Thread Pontus Pihlgren
On Mon, Dec 12, 2016 at 10:59:36AM -0500, et...@757.org wrote: > >Damn, you're right, that's the pinout for the Indy. I have both an Indy and > >an Indigo with a modified ATX power supply. > > You're running an Indigo on ATX power supply guts? Interesting. My co-worker > has a SGI Fuel on his desk

ARPAnet maps

2016-12-13 Thread jim stephens
A friend posted an interesting map of the network as it grew (his interest was the 1981 map) of Arpanet interconnects. They range from the beginning to at least that map. I can't share that one both because it's on Facebook, and because it was low quality having been bastardized by FB and I c

Re: ARPAnet maps

2016-12-13 Thread Al Kossow
On 12/13/16 4:59 PM, jim stephens wrote: > http://www3.sympatico.ca/n.rieck/docs/vms_vs_unix.html > The '71 map shows the 810 connected to an IMP and no 6700 which implies to me that the 810 was working as a TIP

Re: ARPAnet maps

2016-12-13 Thread Al Kossow
http://files.eric.ed.gov/fulltext/ED097913.pdf is interesting. Jef Raskin and a Microdata 800 at UCSD On 12/13/16 6:17 PM, Al Kossow wrote: > > > On 12/13/16 4:59 PM, jim stephens wrote: > >> http://www3.sympatico.ca/n.rieck/docs/vms_vs_unix.html >> > The '71 map shows the 810 connected to

Re: Y Combinator is restoring one of Alan Kay's Xerox Alto machines

2016-12-13 Thread Curious Marc
Session 12 https://youtu.be/XhIohWr10kU We were happy and humbled to get a friendly visit from David Boggs (Alto engineer, co-inventor of Ethernet) and Ron Crane (also ex-Xerox, co-founder of 3Com with Bob Metcalfe, and CHM restoration team colleague). > On Nov 23, 2016, at 1:37 PM, Curious Ma

Z-80 code question about a loop that depends on the contents of the refresh register

2016-12-13 Thread Ethan Dicks
Hi, All, I'm disassembling a vintage program and ran across this bit of code that is causing emulators to hang... MYSUB: LD A,R JP M, MYSUB JR Z, MYSUB CP 0x65 RET M LD A, 0x32 RET I know plenty of 8-bit assembler (mostly 6502, 1802, and a couple others), but I'm by no means exper

Re: Z-80 code question about a loop that depends on the contents of the refresh register

2016-12-13 Thread Ethan Dicks
On Tue, Dec 13, 2016 at 5:49 PM, Ethan Dicks wrote: > I'm disassembling a vintage program... > > MYSUB: > LD A,R... > > So far, this loop hangs on all three emulators I've tried - simh's > altairz80, simcpm010 for AmigaDOS, and EMUZ80 for Raspberry Pi. I'm > guessing none of these environments

Re: Z-80 code question about a loop that depends on the contents of the refresh register

2016-12-13 Thread Ethan Dicks
On Tue, Dec 13, 2016 at 5:51 PM, Ethan Dicks wrote: > On Tue, Dec 13, 2016 at 5:49 PM, Ethan Dicks wrote: >> I'm disassembling a vintage program... >> >> MYSUB: >> LD A,R... I'm now thinking this is the RNG which is supposed to return a number from 0-100 in most cases, for calculating probabil

RE: Odd "endianness" [was Re: RE: Base 64 posts to the list]

2016-12-13 Thread Rich Alderson
From: Eric Smith Sent: Saturday, December 10, 2016 6:38 PM > On Fri, Dec 9, 2016 at 12:47 PM, Rich Alderson > wrote: >> [1] For non-PDP10 programmers: The original architecture of the PDP-6 >> and PDP-10 used an 18-bit (256KW) address space. The KI-10 >> processor added a 22-bit pager

ADM-3A Lower case ROM issue

2016-12-13 Thread Steve Hatle
I acquired an ADM3-A a while back from the NWA auction, and a generous friend was able to get me the lower case ROM chip that was "missing" from my terminal. I set the DIP switches and installed the ROM. When I turned on the terminal, the whole screen was filled with "`" characters before the h

Re: Z-80 code question about a loop that depends on the contents of the refresh register

2016-12-13 Thread Tony Duell
On Tue, Dec 13, 2016 at 10:49 PM, Ethan Dicks wrote: > Hi, All, > > I'm disassembling a vintage program and ran across this bit of code > that is causing emulators to hang... > > MYSUB: > LD A,R > JP M, MYSUB > JR Z, MYSUB > CP 0x65 > RET M > LD A, 0x32 > RET > > > I know plenty of 8

Re: ADM-3A Lower case ROM issue

2016-12-13 Thread Ian S. King
On Tue, Dec 13, 2016 at 5:50 PM, Steve Hatle wrote: > I acquired an ADM3-A a while back from the NWA auction, and a > generous friend was able to get me the lower case ROM chip that > was "missing" from my terminal. > > I set the DIP switches and installed the ROM. When I turned on the > termina