25 Dec
1998
25 Dec
'98
1:20 a.m.
How do I change my email address on this forum.
My currenet email address is handyman(a)sprintmail.com
My new email address will be musicman38(a)mindspring.com
Phil...
25 Dec
25 Dec
1:50 p.m.
Phil Clayton wrote:
How do I change my email address on this forum.
My currenet email address is handyman(a)sprintmail.com
My new email address will be musicman38(a)mindspring.com
Phil...
To the best of my knowledge from my last change, you need to send an
unsubscribe message to listproc(a)u.washington.edu while your mail
identification id is set to your old address, and then once you get
verification from listproc, change your mail id to your new one and send
a subscribe message to the same address. You should pick up at the same
point in themessages if it goes through smoothly.
8:59 a.m.
New subject: Apple 1
Pretty interesting picture and information on the Apple 1 computer.
http://www.chass.utoronto.ca/~edtracy/apple1.html
Phil..
10:23 p.m.
New subject: Apple 1
Phil Clayton <handyman(a)sprintmail.com> wrote on Fri, 25 Dec 1998 14:59:46 -0500
Pretty interesting picture and information on the Apple
1 computer.
http://www.chass.utoronto.ca/~edtracy/apple1.html
Phil..
Beautiful site... I poked around in there a bit, but didn't see what I
really wanted to see... a circuit board design for the Apple 1. Anybody
know if such exists, without having one of these artifacts in hand? I've
got a number of the early MC68000 (gold & ceramic) chips that would have
been used in this circuitry. -Jim Weiler
"I wish I was deep, instead of just macho."
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
mailto:heavy@ctesc.net Jim Weiler mailto:native-sun@usa.net
http://home.talkcity.com/TechnologyWay/heavyside/index.html
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
26 Dec
26 Dec
10:44 a.m.
New subject: Apple 1
On Sat, 26 Dec 1998, Jim Weiler wrote:
I've
got a number of the early MC68000 (gold & ceramic) chips that would have
been used in this circuitry. -Jim Weiler
Uhh, the 68000 didn't exist in the days of the Apple 1. The apple 1 used
a 6502 (or a 6800 IIRC -- is that what you meant?).
ttyl
srw
12:54 p.m.
New subject: Apple 1
On Sat, 26 Dec 1998, Jim Weiler wrote:
Nope, sorry, my mistake. What I have is the 68000. I misread the text
there, and jumped to an extra zero. Nevermind. I wasn't into computers that
far back, but I still think it'd be kewl to build one of those up from
scratch. -Jim Weiler
"I wish I was deep, instead of just macho."
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
mailto:heavy@ctesc.net Jim Weiler mailto:native-sun@usa.net
http://home.talkcity.com/TechnologyWay/heavyside/index.html
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I've
got a number of the early MC68000 (gold & ceramic) chips that would have
been used in this circuitry. -Jim Weiler
Uhh, the 68000 didn't exist in the days of the Apple 1. The apple 1 used
a 6502 (or a 6800 IIRC -- is that what you meant?).
ttyl
srw 
27 Dec
27 Dec
5:19 a.m.
New subject: Apple 1
>On Sat, 26 Dec 1998, Jim Weiler wrote:
>
>> I've
>> got a number of the early MC68000 (gold & ceramic) chips that would have
>> been used in this circuitry. -Jim Weiler
As has been pointed out, Apples used the 6502 (or descendents). On the 68K
topic, I used to work for a company that made intellegent (synchronous) serial
cards for PDP-11 and VAXen. My former boss still has XC68000 S/N 424. The
very first run was hand numbered; we were told that 1-400 were for in-house
Motorola projects. We only got one because our company was so persistent
to the sales office that they shipped us a chip to shut us up.
The fun part is that the chip has bugs. Some of the instructions (I don't
know which ones) cause a microcode exception and the processor restarts
the microcode engine, resulting in delays of several microseconds. The
instruction completes, but not in the advertised number of machine cycles.
This wasn't a real problem for us, but some early 68K designs borrowed
heavily from existing Z-80 designs, including processor driven DRAM refresh.
These boards just lost the contents of memory whenever certain instructions
were executed. We had 32K of 2114 1Kx4 SRAMs. Our board performed oddly,
but it still worked. AFAIK, all MC68000 chips work to spec.
Anyone want to buy a vintage 1982, gold and ceramic Motorola MC68000? Make
offer. Not available in stores. Not found on eBay.
-ethan
8:17 a.m.
New subject: Apple 1
Ethan Dicks <erd(a)infinet.com> wrote:
AFAIK, all MC68000 chips work to spec.
They had various bugs that were sometimes mentioned in later data sheets.
For instance, early parts would generate the UDS* and/or LDS* strobes even
on accesses that cause an address exception. This can lead to memory
corruption. Although since usually an address exception means that the
system (or process) failed, it usually didn't matter. Which is probably
why they didn't find it early on.
Very early parts had a slightly different set of shift and rotate
instructions than later parts. This was mentioned in some early data sheets,
but not in more recent ones.
Eric
9344
days inactive
9346
days old
7 comments
6 participants
participants (6)
-
erd＠infinet.com -
eric＠brouhaha.com -
handyman＠sprintmail.com -
heavy＠ctesc.net -
rhblake＠bigfoot.com -
scott＠saskatoon.com