-----Original Message-----
From: Dwight Elvey <elvey(a)hal.com>
>Hi Mike
> The 1101 was a 256x1 part 2102 is a 1Kx1 part. I'm sure
>the pinouts would be similar but exactly what I don't know.
>2101 is a 256x4. I think all of these have seperate input
>and outputs, unlike the 2111 that has a bidirectional I/O.
Thanks Dwight.
There is a good article in Kilobaud #1, "How Memory Works" that features the
2102.... It shows the chip's 1K bits as a 32x32 'memory matrix' addressable
in a row(5 bit) x column(5 bit) format.
- Mike:dogas@leading.net
>>
>> Try "Exec". I don't have any details of how to use it, sorry. Let me know
>> what you find out.
>>
>
> Hmmm...this brings back some memories. From my recollection, this
> statement accepted a string argument. The character string supplied
> was coded in a special pseudo-hexadecimal:
>
> 0="0", 1="1", 2="2", 3="3", 4="4", 5="5", 6="6", 7="7"
> 8="8", 9="9", a=":", b=";" c="<", d="=", e=">", f="?"
>
> For example, to represent the hex sequence 6e7f391d, the string would be
> "6>7?391="
>
> Each two characters represent a byte.
>
> Now, using this method, you could 'code' 6800 machine code instructions.
>
> The EXEC statement would store the bytes supplied in the string argument
> as a linear sequence of machine code, and cause a jump to the segment
> of code. I don't recall if it was JMP'd to, or JSR'd to...and don't
> remember any of the details of how to return from a segment of code
> executed with the EXEC statement. Obviously, sending random stuff
> to an EXEC statement could wedge the machine up.
>
> I remember that EXEC was used frequently by folks who were experts
> with the machine (and had magic lists of the internal runtime
> calls) to make game programs and stuff in machine code that would
> run much faster than the interpreted BASIC. It also allowed
> 'extensions' to BASIC that you could use to do things like PEEK and POKE,
> etc. There were conventions for passing variables in and out of
> EXEC'd code, so BASIC could be used for 'high level' functions, and
> the fast EXEC'd machine code could be used for time-critical or
> other functions that were too slow, or too tedious (IE: bit manipulation)
> to do in BASIC.
>
> Hope this helps. It's all from foggy memories..all the fun with 4051's
> that I had happened sometime around 1978...21 years ago. I'm amazed
> that I can remember ANY of it, given that many times I can't remember
> where I put my car keys :-)
Rick, you wonderful person! I wonder what this does on the 4052... Something
to try when I get home tonight, perhaps.
Joe, what was it you were saying about already having picked Rick's brains?
(FWIW I am still negotiating a trade with Zane for that ROM)
Now what we need are some exec calls for things like peek, poke, reading the
joystick port without a "pointer" instruction, and so on. I must step up the
pace of my own research...
Philip.
I'm following the discussion around the danger of household circuits:
>> I have worked on various appliances ,electrical devices and/or wiring
>> most of my life, close to 50 years, and I have been "bitten" on occasion.
>> Of course, except for stoves and dryers, the voltage here is 110 v. I
>can
>> understand the respect given to 220v.(3wire) and have never worked on
>> anything at that voltage without shutting down the circuit. I have also
>been
>> very cautious about working on anything in damp conditions like in a
>> washroom or wet basement.
Travelling in some other EU countryes, I've noticed that
few household installations have "SAFETY DIFFERENTIAL-CURRENT BREAKERS"
(here in Italy are called "Salva-vita=Life-saver), and also from these
messages I learn that 220v are used also in the US (surprise) for heavy
applications, but again nobody from both side of the ocean refers to the
presence, safetiness, of these devices that here are used and mandatory from
15-20 years.
I would like to hear from you all what's the situation there, if they are
diffused, you use them, are considered (toghether with earthing) enough to
avoid danger situations.
Ciao
Riccardo Romagnoli <chemif(a)mbox.queen.it>
-----Original Message-----
From: Dwight Elvey <elvey(a)hal.com>
>> Anyone know where 1101 RAM chips are for sale (if at all?)
BTW, the pinouts for the 2102 is 1-a6,2-a5, 3-r/w, 4-a1,
5-a2,6-a3,7-a4,8-a0,9-gnd,10-vcc,11-din,12-dout,13-ce,14-a9,15-a8,16-a7.
So, what's the difference between the 2102 and 1101? 512 bits???
- Mike, dogas(a)leading.net
> Philip,
>
> You need to read the messages more closely. I was the one that found the
I probably do, but I don't have time for that :-) In fact I didn't see your
message at all! (and I've been getting other Classiccmp messages out of order,
but that's nothing new)
> EXEC command and posted it here. And yes I had already talked to Rick
> about them but he couldn't remember the command or anything about it. I
> told you about that conversation. It wasn't till I posted the message about
> the EXEC command and Rick read it that it stuck a chord and he remembered
> the codes to use with it.
Oh, you mean you'd already _tried_ to pick Rick's brains. That's something
quite different ;-) ;-) ;-)
Philip.
As the Amiga 1000 has been brought up ....
Sometime last year I acquired an Amiga 1000 (Built Feb 1986) and an
Amiga 500 but only recently have I got arround to playing with them.
The 1000 came with a sidecar unit and by now you should have
guessed what I'm about to ask ....
I've got the 1000, I've got the sidecar, I've got kickstart
and workbench but I haven't got the
software required to access the sidecar from the amiga.
The sidecar has 448K of memory (256K on motherboard (with
space for another 256K) plus 3x64K on a ISA card (with space for
another 64K) and a hardcard (which hopefully has an amiga partition).
Anyone out there have this software or know where I can get it
from,
Ta,
Doug.
Keep in mind that the 820 is from Xerox and the 802/803/806 . . . are from
Televideo. The TVI stuff is MUCH more sophisticated in design and
packaging, not to mention capabilities. The TVI models used the 1793 and
5.25" DSDD while the XEROX used the 1771 with 8" SSSD . . .
Dick
----------
> From: Don Maslin <donm(a)cts.com>
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: Xerox 820 family almost complete
> Date: Wednesday, February 24, 1999 1:38 PM
>
> On Wed, 24 Feb 1999, Joe wrote:
>
> > At 10:45 PM 2/23/99 -0800, George wrote:
> >
> > >Is there still a source for 5.25 inch CP/M for the Xerox 820?
> > >
> >
> > Will the CPM for the 803 or one of the other models work on the 820?
> > Does anyone know what the capability is between the various Televiedo
models?
>
> No, and for a variety of reasons, Joe. First. the 820 can only read
single
> density disks and the TeleVideo disks are all double density. Even the
> DD 820-II disk uses a single density first track, so it would choke too.
> Second, the Xerox 820 disks read all of the first side before even
> venturing into the second side, whereas, the TeleVideo machines read the
> tracks on both sides of the disk before moving the heads to the nexr
> track. Third, there are other format differences also. Different number
> of sectors per track, different skew, ...
>
> As to the Televideo disks, most of the machines can read/write another
> models disks. However, there is much less commonality between CP/M
> operating systems used. A few will interchange, others will not.
>
> - don
>
I only mentioned it because I was occasionally prone to mix them up myself.
They had numerous things in common. They were both single-board types of
approximately the same size, they both ran CP/M, they both used a Z-80 . .
Dick
----------
> From: Joe <rigdonj(a)intellistar.net>
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: Xerox 820 family almost complete
> Date: Thursday, February 25, 1999 1:37 AM
>
> Dick,
>
> At 10:46 PM 2/24/99 -0700, you wrote:
> >Keep in mind that the 820 is from Xerox and the 802/803/806 . . . are
from
> >Televideo.
>
> Yeah, I realized that after Don posted his reply. I don't know what I
> was thinking of when I asked that question.
>
> Joe
Hi Sam and all,
At 09:03 PM 2/24/99 -0800, you wrote:
>On Wed, 24 Feb 1999, Dave Dameron wrote:
>
>> I have both the AMD and Intel data sheets for the 1101(A). They also may be
>> in a early (~1976) Intel data catalog.
>
>Cool. Is it a couple pages I can convince you to photocopy and mail out
>for a future favor?
Yes, the Intel data sheet is 4 pages.
>
>> >Anyone know where 1101 RAM chips are for sale (if at all?)
>>
>> A few years ago I searched all over the place, not only Halted, James, ACP,
>> and any other advertisers in early Byte magagines that might still exist,
>> but the "obsolete ic" house resellers too. Remember the ads for "8008 +8
>> 2102's"? I only found about 3 "tubes", but may not ever use them as wire
>> wrapping 8 chips give only 256 bytes. How many do you want?
>>
>> Can't you find this stuff by the barrel and data sheets by the ream there
>> in Si valley :-)? ..Like a west coast "Poly Pac's".
>
>Probably at one of these surplus shops somewhere. I've just never looked
>before (never had a need until now). Based on some of the exotic things
>I've found over the years, I don't doubt there's at least one of
>everything laying around this great Valley somewhere (I know there's an
>IBM 360 stashed in someone's garage waiting to be liberated).
I think I bought some 1101's at Alltronics in San Jose. Also, for those
looking for replacements, the Mostek MK4007 seems functionally and pinout
the same, although they call it a dynamic ram?
-Dave
>
>Sellam Alternate e-mail:
dastar(a)siconic.com
>---------------------------------------------------------------------------
---
>Always hasslin' the man.
>
-----Original Message-----
From: Dave Dameron <ddameron(a)earthlink.net>
>For the 8008, the best is the mcs8 microcomputer set users manual. Someone
>on the list just found one in the last week or 2. I probably have a
That would be me... Let me know is some info is still needed
- Mike: dogas(a)leading.net
