Does any one here collect old microprocessors like 4004, 4040, 8008,
8080 etc?
The oldest CPU type I have is an NEC 8080A. Still trying to figure out
how to make use of it. The legs are pretty corroded (used to live in
humid climates).
I've a Z8001 too, paid more than $100 for it but never used. Maybe
I'll find an Olivetti M20 one of these days...
There's a UK company that used to advertise in the UK version of the
Elektor 4-5 years ago. They advertised the TI9900, NS32032 and other
odd CPUs.
Ben
> -spc (Although with proper programming, the CGA could support 160x100
> 16 colors (or was it 160x200?))
160x100. You program the 6845 to display two scanlines per character then
use the half-on/half-off blocks to control the pixels.
Roger Ivie
ivie(a)cc.usu.edu
> The reason I liked the 7000 so much was the display. It used a - I want
> to say NEC 7202 display chip - might be wrong tho. It allowed vector
> graphics and text to share the same screen. You could tell it how much
> text and then anything above that was graphics. It took basically plotting
> commands to do the graphics. Never did understand why that didn't catch
> on!
That would be the NEC 7220. It was also used in the DEC Rainbow graphics
option; I've not seen a DECmate II graphices option, but I suspect it was
used there as well.
A friend of mine built a video card for an Apple ][ using the 7220. We could
do 1024 x 780, IIRC. He was experimenting with it and a touch screen device
(a flat glas plate to go over the monitor with transducers along two edges;
it put a high-frequency vibration on the glass then listened for echoes) as
a programmable user interface. We were using Microsoft F80 on the Softcard
connected to 8" DSDD diskettes. When does it start being an Apple ][ and start
being a CP/M machine?
Oh yeah; we used a plotting library from a company called Tesseract. Anyone
else used it?
Roger Ivie
ivie(a)cc.usu.edu
> >What is a Heath H8 worth?
I generally see H89's go for $25 US at hamfests. *I* wouldn't tie up $100
unless it was lovely and I really wanted one.
Of course...it's worth what you want to pay for it, as Jim says
I'd like to suggest that we all keep in mind the following tenets to
help reduce the amount of superfluous traffic on this discussion list:
- If your reply is to one individual, please send directly to them
(you'll have to override your email program's default Reply address).
- Please direct responses to solicitations such as group purchases, etc.
directly to the solicitor only.
thanks!
Kai
It's been years since I fiddled with a PCjr. It has a self test, to
activate press Control-Alternate-Insert. Can't remember the specifics of
the self test though.
I don't know if Lotus for the jr required a disk, but I have been told it
came on two separate cartridges.
At 02:35 PM 6/23/97 +0000, you wrote:
>As such, right now I have 1 complete Jr with floppy drive, sidecar, and
>128K mem expansion (I believe... hafta look at the chips & calculate the
>storage) with an extra internal floppy drive, an extra motherboard, an
>extra keyboard (neither are chicklet, and one has a few stuck keys) I think
>there was a Lotus 123 cartridge with it (but I heard rumors that it needed
>a disk as well?) and a basic cartridge. There may be more stuff, but I
>haven't looked at it since the move...
>
>Are you interested in it?
>
>HTH,
>Roger "Merch" Merchberger
James
jscarter(a)worldnet.att.net
In the process of getting ready to upgrade my RQD11 QBus/SCSI adapter to
near-current level, I discovered that I need a source for a hard-to-get
PROM. Specifically, one of two parts should do it.
Signetics 82HS189
AMD AM27S281A
I've already checked with the manufacturers and a couple of local
distributors. Yes, I'll be looking for these on my upcoming scrounging
trip, but it would be a Really Cool Thing if someone could point me at a
source for them.
Thanks in advance.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Sysop, The Dragon's Cave BBS (Fidonet 1:343/272)
(Hamateur: WD6EOS) (E-mail: kyrrin(a)wizards.net)
http://www.wizards.net/technoid
"Our science can only describe an object, event, or living thing in our own
human terms. It cannot, in any way, define any of them..."
Yes, that's correct. Over in the UK you had the Dragon, a neat little machine.
Regards,
Bob
----------
From: e.tedeschi[SMTP:e.tedeschi@ndirect.co.uk]
Sent: Sunday, June 22, 1997 3:22 AM
To: Discussion re-collecting of classic computers
Subject: Cocos
Just to help me understand better...when you refer to Cocos, do you
refer to the Tandy TRS-80 COlour COmputers?
Thanks
enrico
--
================================================================
Enrico Tedeschi, 54, Easthill Drive, BRIGHTON BN41 2FD, U.K.
tel/fax +(0)1273 701650 (24 hours) or 0850 104725 mobile
website <http://www.ndirect.co.uk/~e.tedeschi>
================================================================
visit Brighton: <http://www.brighton.co.uk/tourist/welcome.htm>
--------------------
Wanted:
--------------------
Apple I *
Altair 680 *
Altair 8800a ("a" only) *
Altair disk system *
Compucolor II or 8051
Apple Lisa
Exidy Sorcerer
IBM 5100
KIM-1
RCA COSMAC (ELF/VIP)
Commodore PET dual floppy system model 2040
Commodore SX-64 Portable (only if cheap or local)
TRS-80 Model III (only if cheap or local)
* Will trade Altair 8800b up/down/across for Apple I, or Altair
equipment. Will also make substantial cash offers for these items and
will reward leads.
--------------------
For Trade:
--------------------
North Star Horizon (wood case model)
Apple ///+
Mattel Aquarius
C64 in original color display box
Kaypro II (wonky keyboard; FREE if you pick up, Seattle area)
(Must sell/trade! Need space! Especially good deals available for
LOCALS with reasonably interesting trades and/or cash offers, since that
saves me so much time and effort with shipping!)
Kai
A friend of mine has the following systems available for sale (he's not
a collector). Neither of us could really come up with a price, since
these systems are a little out of my line. The Sanyo is a Z80 (not to be
confused with the later MBC-550 which was an early 8088 MS-DOS clone).
Both are in full operating condition.
Altos 586
- 8086/512K
- Xenix 3.0b
- With 2 terminals (supports 8-9 users)
- Hard drive
- Floppy
- Xenix Multiplan, etc.
Sanyo MBC-1000
- Z80A
- Built-in monitor
- Single floppy
- External 10MB HD
- Keyboard
- CP/M, WordStar, CalcStar, etc.
email thadh(a)microsoft.com with offers (local preferred due to the size
of this stuff)
You are correct about the slowness of the 1541, and I was not saying the 64
was 100% perfect, but for the money, the 64 still gives more bang in the
video and sound department. and recently, CMD (Creative Micro Designs) wrote
a new OS called JiffyDOS. it was comaptible with the original ROM, but used
better timing loops that increased the serial bus performance! you just
replace the ROM in the motherboard, and the rom in the 1541 with jiffydos,
and the results were fantastic, just by rewriting the firmware, the 1541 was
now FASTER than a 486 running MS-Hoss with a 5.25 drive. but no matter what
8 bit cpu you use, it is amazing what you can do with 1 MHZ by proper
software design.
I also timed the performace with a stopwatch, and I loaded a large music
editor from the same disk, 1541 drive, with and without jiffyDOS
stock 1541 1541 with Jdos
1 minute 20 sec 10 SECONDS!!!
pretty spiffy eh?
Phew. Well I've pruned through my mail and made it to the bottom.
To all of you who sent me personal e-mail over the last week - I'll
get back to you in the next couple days. I'll also work on processing
all the unsubs.
On topic - this weekend I picked up some stuff:
Need info on:
Acorn monitor with strange connector, switch selects modes I, II, III
5 1/4" floppy drive for Atari ST (no brand)
Just gloating:
Apple IIgs with monitor and 5.25" drive (ROM 1) for $15
Stack of needed manuals at 0.39$ ea. (I'll post duplicates)
Apple Disk III drive
Franklin Ace 1000
An interesting one - I already have a 1000 and unforch. I think this
one is too damaged to save (crushed case - cracked board). The thing
is it has a strange disk controller which the Disk III (as in Apple
II disk drive) was attached to. It also has a video board of some
kind. No part numbers but I'll play around with it some more later.
Bill
----------------------------------------------------
Bill Whitson - Classic Computers ListOp
bill(a)booster.u.washinton.edu or bcw(a)u.washington.edu
http://weber.u.washington.edu/~bcw
At 05:04 PM 6/22/97 -0700, you wrote:
>On Sun, 22 Jun 1997, A.R. Duell wrote:
>
>> > from, there are compnents of computers that are shear art as the disk
>> > controller in the apple II (from what I read the board was drawn 'not
>>
>> I'll have to disagree with you there. IMHO the Disk II controller is
>> nothing other than a kludge. It could certainly have done with a track 0
>> sensor (that would have stopped the heads from banging on start-up). And,
>> as a hardware designer, I don't like designs where most of the
>> functionality is handled in software.
>
>Blasphemer! No really though, if you must call the Disk ][ controller a
>kludge, at least qualify it by calling it a beautiful kludge, which it is.
>Also, having software control over the disk drive is not a bad thing at
>all. It allowed you to play directly with the bits on the disks and make
>your own disk formats. It provided years of fun and challenge during my
>teenage days trying to crack the ever-more-complicated disk copy
>protection schemes that the software houses kept creating by way of being
>able to control the disk circuitry from software.
>
>> > totally in the dark about). Case in point, Exidy Sorceror, I purchased
>> > one and sent it to Sam Ismael, he is now looking for information, not
>> > very many people ever seen one, much less an ad for one, sometimes the
>>
>> Somewhere I have a Techref for the Sorceror, and one for the S100 adapter
>> for it. I also have some user group newsletters, etc. Feel free to pester
>> me on this list if you want me to dig this stuff out.
>>
>> BTW, it's not up for grabs. I need it to maintain my Sorceror :-)
>
>Tony, any information you can e-mail me or send me concerning the
>Sorcerer would be appreciated. I need information about the power
>requirements, plus just general information such as how much RAM it came
>with, processor type, built-in languages, etc. Thanks.
>
>Sam
Hello there, I an fairly new here, but I am interested in all kinds of
hardware and software hacks.
Someone out there mentioned the 'sophistication' of the Apple ]['s video
addressing, saying that the
RAM refresh steals CPU cycles, Apples method is worse than a kludge, it was
simply a crufted idea. yes, the Disk II is an elegent kludge,as ALL of my
homebrewed electronic gear are kludges just to make them work!<G>. My first
computer was a Commodore 64, and comparing it to apples(not oranges :0) the
64 is WAY more advanced, and it too shares a medium populated motherboard. I
can do 90% of the multimedia stuff on the 64 as you can with a P-133! my
point being, the Apple and 64 both had 6502 compatible proccessors, but the
6510 used by the 64 has smarter memory mangament, and it is fast enough to
refresh the ram AND do sprite graphics AND use bit mapped memory. adding
perhiperals to the 64 via the serial bus worked NICE, and I can prove
history is repeating itself. Look at the new USB (Universal Serial Bus)
standard, where they want to run evrything from keyboards, mice, modems
etc... the Wintel croud calls it BRAND NEW IDEA, but we did this 10 years or
more ago. I got a good taste of Apple's machines in school, and they were
ok, but nothing I would ever try to own. the only drawback to the C=64 is
that it did not have an expansion bus built in, however it did have a
expansion connector which you can hook up a passive backplane to.
I dont have much classic stuff but here is what I have:
3 CoCo's, one with 1 floppy drive, all 16K machines. the floppy drive as
sold by radio shack is actually an IBM compatible 5.25 drive! the ONLY
difference is an attempt by radio shack to foil anyone trying to USE off the
shelf floppy drives by placing the ribbon connector on the opposite side,
and because of this, the data cable was too short to connect the normal
drive. But the controller card and pinouts are all the same IBM standard.
The reason was that radio scrap wanted to charge you $400 for adding a drive
that costed $50 max at the time. so IBM drives are not limited and can be
used in any way, it just takes more hacker skill to implement it.
3 Commodore 64's, one is souped up with JiffyDOS, 1 meg REU, and 1.6 MEG
floppy drive.
2 Commodore 128's both work and was extensively used, and because of this,
they are on the verge of expiring... the keyboards on the 128's were never
as durable as the 64's.
1 IBM XT works, but needs XT keyboard.
1 IBM 286-12, works too, and loaded with MORE TTL than the XT was....
Now the rest of the bunch are not classic, but I will place them here to
make the list complete.
1 Acer 386-33, used as a file server
1 home built AMD 586 machine which is what I am composing this message from.
I was looking through a book I had picked up a year or so ago called
"The Elementary Commodore 64". Towards the front amongst the
description of various types of peripherals available for the C64 under
the title "Other Gadgets" was this:
Z-80 CP/M -- This cartridge goes right into the cartridge slot to turn
your machine into a Z-80 base computer enabling you to access the vast
array of CP/M software. With over 2000 CP/M software programs
available, there is little you will not be able to access.
Dan Rector
At 21:44 20/06/97 +0100, we wrote:
>>
>>>Besides, I was talking about CP/M for the Commodore 1541 drive. That's a
>>>multi-speed drive that uses GCR encoding, not MFM. Try writing THAT with
>>>22DISK on your PC-clone.
>>>I used to know that only C=1570 and C=1571 were capable to read and write
>>CP/M disks in a proper way. (GCR+MFM)
>>By the way anyone else apart me owning a C=1570 here?
>>
>>Ciao
>>
>>i own a 1570, its a american one with a step down transformer, Its
>connected to my PC, and guess what, it writes CPM!!!
>Steve
>Emulator BBS
>01284 760851
>Keeping 8-Bit ALIVE
Hi Steve,
Yours was the only one response I get (since now) from C=1570 owners
Mine was made in Germany (did you buy it in the U.S.?)
Ciao
A place in my location called surplus exchange, has about a dozen pcJR's on
a skid. I didn't find any power supplies, but by the looks of the place,
they could be anywhere. Let me know what to look for when I go back and
I'll see if I can't rescue some more. (assuming the old lady lets me). I
know the PC JR I bought, has a Parallell port on the outside, which I
learned only today is a "Side-car". I have dozens of composite mono and
color monitors from my apple// and Zenith collections. I also managed to
scrounge out of this pile, [one] keyboard with cable, and [one] joystick
and about 5 or 6 cartridges. The other PCjr,s seemed to be alone. Let me
know what to look for on the CPU's and I can go through all of them one by
one. If anyone else want's one, let me know and we can see what we can do.
Last trip there I got a TI99/4a, atari 800, 1050 drive, 410 drive, Tandy
COCO 1,. Commodore 1741 drive, Commodore mps 803 printer (I think) it works
good. And an apple//+ for parts. I paid 35 for everything. I noticed this
pallete of Jr's but I sure as heck didn't see any monitors, keyboards or
power, except the one keyboard I did find elsewhere in the building.
----------
> From: jpero(a)mail.cgo.wave.ca
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: IBM PCjr
> Date: Monday, June 23, 1997 9:28 AM
>
>
> > Welp, that rules out rigging one, thats beyond my techincal ability to
> > fabricate. Anyone have an Extra for sale or trade?
> They're underrated but you can just get one to keep orginals but I
> could supply you a adapter for your own use with a PC power supply
> box. This way, you can simply plug in and go?
>
> I do not know where to get these black transformer bricks. The
> PCjr around here is rare as hen's teeth in my hometown. :)
> Considering that, I was lucky to find it in standard configuration of
> parallel port side car and the box but no cartidges! :(
>
> I also overheard that someone was trying to use TV with PCjr, you
> missed something really needed: demodulator box or find a computer
> compsite monitor which works better especially in 80 column mode.
> Commorde color monitors is good picks for this.
>
> Jason D.
but *not* from me! Read carefully!
Forwarded from comp.apple2.marketplace
--- Begin forwarded message ---
Date: Mon, 23 Jun 1997 05:22:35 -0600
From: HartranftR(a)nabisco.com
Newsgroups: comp.sys.apple2.marketplace
Subject: Apple III's for sale
FYI ... I have 5 Apple ///'s for sale (improved re-release
version), including original monitors. Some with 512K memory. Some
peripherals also, including spare parts, Corvus 20 meg server with
related Apple III interface cards. Would prefer selling at least
computers/monitors in bulk and will consider any reasonable offers. I
understand there are now thriving museums and actual user groups still
utilizing. If NOT interested, would appreciate any leads for other
possible contacts. These machines actually served us quite well !
Thanks
Rich H
-------------------==== Posted via Deja News ====-----------------------
http://www.dejanews.com/ Search, Read, Post to Usenet
--- end of forwarded message ---
-jim
---
jimw(a)agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
Computer Garage Fax - (503) 646-0174
Okay, I asked a simple question. Got 3 differnt answers, and folks
referring to "over here" and whatever.
I live in the US, I will need to go to radio shack to build this.
Which diagram is the safest, what parts do I need, and what do I do.
----------
> From: jpero(a)mail.cgo.wave.ca
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: IBM PCjr Allright?????
> Date: Monday, June 23, 1997 12:27 PM
>
>
> > Yes, I've seen that convention. But if you buy a transformer over here,
> > the connection tags will be labelled 0V and 17V or whatever. I've never
> > seen a physical transformer marked with a dot (that's not to say they
> > don't exist).
> Yeah, nothing marked to tell us of phases. :) So that invites
> mistakes by unwary who makes power supplies on their own. That why I
> offered warning. :)
>
> (hey, my power supply did not work...) eyes up. :)
>
> Jason D.
What am I making here? Do we know yet?
----------
> From: jpero(a)mail.cgo.wave.ca
> To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
> Subject: Re: IBM PCjr
> Date: Monday, June 23, 1997 9:51 AM
>
> Hello Tony,
> >
> > >From memory the central pin is chassis ground and the outside 2 are
18V AC
> > at about 3A.
> Actually 34vac 2amp center tapped transformer. The center tap goes
> to ground, what else how can negative voltages can be generated so
> it needs this ground. The both outside 2 pins for 17v ac lines goes
> there. The card rectify it to generate 3 dc voltages, two is
> positive and other one is negative. Bulk of the components is used
> to generate 5vdc, and a wimpy 12vdc source for the floppy drive and
> fan. And last one is in very small current negative current -12v dc
> which takes this voltage and go through a 7905 regulator to get -5v
> dc, both voltages are strictly for serial use and little use for
> else.
>
> Funny, instead of 60hz, you get the same type of circuit design in
> secondary side in lots of switching power supplies with few minor
> differences.
>
> The limits to overdrive if you do, both card and slot is due to the
> current limit allowance per contact on that slot. :( Leave it to be
> and parallel the seperate power sources to the sidecars if they have
> them. Another problem with this is that 3 connections is not enough
> to carry more than 2amp on each socket.
>
> By the way, I am Electomechanical major in training "on hold". :)
>
> > The manual doesn't give the schematics of the transformer unit (it does
> > for the PSU card in the main unit), and it's not clear from the
> > description whether the AC input is centre-tapped to ground or not.
> > Looking at the schematics, I think that it is _NOT_
>
> Oh yes, I did saw the techref for the outside PSU transformer is
> pretty simple just a disconnectable center tapped transformer.
> One thing I hated that they did not give us the that schematics for
> that power card module which I revsere engineered instead!
>
> Jason D.
The Color Computers were:
Color Computer 1: Silver/black, 4K-64K
Color Computer 2: White, 4K-64K
Color Computer 3: White, 64K-128K
Micro Color Computer: White, tiny, 4K
I've never heard of a TDP-100. The Color Computers had ROM BASIC and
most serious users ran an operating system called OS-9 which was kind of
like TopView.
Expansion is via the cartridge slot. The floppy disk interface was
implemented as a cartridge, with the floppy OS in ROM in the controller
cartridge. CoCo floppy drives are rare. Floppies stored 156K. There
was also a hard disk cartridge, believe it or not; plus, a Multi-Pak
Interface which allowed you to connect four different carts and switch
between them.
There are lots of CoCo fanatics around, somebody probably sells parts
and maybe even schematics.
In regard to the Inboard/386, as I recall it had 1MB 32-bit RAM on the
card, and could optionally use motherboard RAM which of course ran at a
much slower rate. My memories may be confused with the Inboard/386 AT,
but I seem to remember a daughtercard which could store an additional
2MB or so. Good luck finding a daughtercard though.
Kai
> ----------
> From: allisonp@world.std.com[SMTP:allisonp@world.std.com]
> Reply To: classiccmp(a)u.washington.edu
> Sent: Tuesday, June 10, 1997 11:01 AM
> To: Discussion re-collecting of classic computers
> Subject: cocos and stuff
>
> HI,
>
> In my non-op list of equipment I have three cocos apparently
> operational.
> They are of two different styles.
>
> The smaller is the TRS80 color computer with real keys on the
> keyboard.
> I have two of these one the case was wiped out, board is ok.
>
> The larger is TDP-100 personal color computer with chiclet keys.
>
> Lacking docs I presume these have rom Basic. What expansion is
> possible
> (there is a port) and how hard. Do they run any real OSs or some
> TRShack?
>
> What's the odds of finding DOCS especially schematics?
>
>
> I have a xt class machine with an Intel Inboard386...(works too!)
> what's the
> odds of finding schemtics or expansion ram for it? The 1meg of ram is
> tight
> for somne stuff. Currently I use it as a 10x faster xt.
>
> Allison
>
> %I've been looking for a Jupiter Ace for over 10 years! Do you have any
> %leads on them?
The schematics were printed in The Computer Journal last year sometime.
IIRC, The Computer Journal's URL is http://www.psyber.com/~tcj/.
> I have a jupiter ace. It's sitting is a closet somewhere back in
> Singapore.
>
> Another sign of the folly of my youth :
I have a Jupiter Ace hanging around, also. However, I just built it
last year. Unfortunately, I had to give the rubber keyboard and most of the
memory back to the fellow I borrowed them from; I haven't yet gotten around to
building a keyboard from aluminized mylar, cardboard, and Tyvek (this should
give me a working keyboard, but it will be of ZX80 quality). I've also found
enough 2114s in an old MDA card to bring my Ace back to life...
> the machine is stripped out,
> the TV modulator is missing
I don't have a modulator in mine. I gummed a 15-pin D connector to it so I
could drive a spare DEC VR201 I had lying around (yes, the VR201 apparently
does have enough range to do PAL; it worked great).
Roger Ivie
ivie(a)cc.usu.edu
Actually, I believe that Hot Coco was a mag published by Wayne Green of 80-Micro and Byte fame.
Regards,
Bob
----------
From: Mike Sprague[SMTP:sprague@VivaNET.com]
Sent: Sunday, June 22, 1997 9:40 AM
To: Discussion re-collecting of classic computers
Subject: Re: Cocos
e.tedeschi wrote:
>
> Just to help me understand better...when you refer to Cocos, do you
> refer to the Tandy TRS-80 COlour COmputers?
Yes. I don't know where the name origionally started, but the support
magazine Tandy put out was called Hot CoCo.
~ Mike
You aren't the only one who does old PC's...that's my business (I
recondition old XT/AT's and sell them. Send strange questions to me.
I also still sell an occasional Commodore piece!
> My main interests (although I enjoy reading all of this) is the older
> systems based on the IBM-PC (XT & AT class) machines and PS/2s which I
> know is a bit more current than many of you like. I also have a
> Commodore 64 and Plus/4 and periphs, I guess I can qualify based on
> that.
"A.R. Duell" <ard12(a)eng.cam.ac.uk> writes:
> I've never liked bit-banged serial ports either (except on
> microcontrollers). They always seem to have problems with full-duplex
> operation. Yes, Apple sold a bit-banged serial port for a time - I have
> one with the manual (which, amazingly contains instructions on linking it
> to an ASR33), presumably to save a UART chip. They then sold one that
> worked properly (in full-duplex mode, etc) under the name 'super serial
> card'. It used (IIRC) a 6850 chip (or was it a 6551?)
Hmm? What was that bit-banged serial port?
If you look in the Apple ][ red book, there is a little circuit
in there that plugs into the game I/O connector and drives a
20mA current loop. Alongside there is a short assembly program
to drive it. Now there is a bit-banger.
There was an unspectacular serial card for the ][. I don't recall it
being a bit banger, just that the combination of it and the printer I
was using at the time (an IDS BrighterWriter) wasn't smart enough to
manage any sort of common flow control, so that I had to run it at 300
baud. I thought it had some sort of UART-like thing, but maybe my
brain is going again.
Hmm, I think it was called the Asynchronous Serial Interface or
something like that. There was also a Synchronous Serial Interface
that (I recently found out) was the Silentype printer interface.
I don't remember the Mountain Hardware CPS card that well, and I feel
very good about that based on what I do remember. Now there was a
klu[d]ge.
The Apple Super Serial Card was designed around a 6551.
There were a couple of other cards designed around the 6850.
The Hayes Micromodem ][ was one of these.
...
Strange as it seems today (now that I have done some programming
around PC-contemptible serial ports), the Apple ][ serial cards and
software generally worked by software-polling-hardware. The only
serial card I can remember supporting interrupts was the Super Serial
Card, and I can't say that I ever saw it used that way. Certainly
none of the "standard" software required it; interrupts just weren't
generally done on Apple ][s.
-Frank McConnell
