Groups > alt.folklore.computers > #153493

Re: the FORTH computer language

From	"Charles Richmond" <numerist@aquaporin4.com>
Newsgroups	alt.folklore.computers
Subject	Re: the FORTH computer language
Date	2015-10-28 17:39 -0500
Organization	A noiseless patient Spider
Message-ID	<n0rin9$3f0$1@dont-email.me> (permalink)
References	(4 earlier) <n0ef99$r9l$1@dont-email.me><PM000522D9EAB50649@aca44296.ipt.aol.com> <n0g7s1$he$1@dont-email.me><PM000522EE18B332A4@aca42931.ipt.aol.com> <n0j050$2n8$1@dont-email.me><PM00052300F849B5FD@aca2d620.ipt.aol.com><11ba64cd-50b8-4778-9c06-97e204309109@googlegroups.com><PM000523155F10ED51@aca410a7.ipt.aol.com> <n0on75$th0$1@dont-email.me><PM00052329BD057935@aca4145e.ipt.aol.com><c307784a-5e50-49db-96a1-d7e0ad199840@googlegroups.com><n0r51h$anr$1@dont-email.me><alpine.LNX.2.02.1510281755340.31930@darkstar.example.org> <844mhamyzz.fsf@example.com>

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"David Hume" <David.Hume@example.com> wrote in message 
news:844mhamyzz.fsf@example.com...
> Michael Black <et472@ncf.ca> writes:
>
>> The 6502 had a bug.  Maybe not a bug, but an early release was missing
>> one of the shift register capabilities, so the manual said to shift
>> the other way using the op-code that did work.  I think it was that
>> the opcode was missing, rather than implemented wrong.  A later
>> release did fix it.
>>
>> The 6502 also had a bug, I can't remember if it was fixed when the
>> CMOS version came along.  The 6502 used a single page for the stack
>> and the right combination of op-codes and address caused a problem,
>> the exact details I can't remember.  That one was simply lived with,
>> someone found the bug, but it was a fairly esoteric combination that
>> caused it.
>>
>
> Wasn't there a bug whereby if you tried to load from an address ending
> in FF it would load the high byte from the wrong place? i.e. 00 on the
> same page.
>
> Anyway I think it was fixed in a later, maybe 6502C.
>

 The 6502's memory indirect jump instruction, JMP (<address>), is partially 
broken. If <address> is hex xxFF (i.e., any word ending in FF), the 
processor will not jump to the address stored in xxFF and xxFF+1 as 
expected, but rather the one defined by xxFF and xx00 (for example, JMP 
($10FF) would jump to the address stored in 10FF and 1000, instead of the 
one stored in 10FF and 1100). This defect continued through the entire NMOS 
line, but was corrected in the CMOS derivatives.

IOW, when the address to be "jump"ed to was stored in memory (i.e., an 
indirect jump through an address that is stored in RAM), if the first byte 
of the address was stored at an address like $xxFF (the last byte of a 256 
byte page) and the next byte was stored on the first byte of the next 256 
byte page...  the second byte of the "jump" address was taken from the first 
byte of the *original* page and *not* the first byte of the next page.

https://en.wikipedia.org/wiki/MOS_Technology_6502

-- 

numerist at aquaporin4 dot com

Thread

the FORTH computer language hancock4@bbs.cpcn.com - 2015-10-19 11:57 -0700
  Re: the FORTH computer language mentificium@gmail.com - 2015-10-20 05:05 -0700
  Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-20 13:57 -0400
    Re: the FORTH computer language Daiyu Hurst <daiyu.hurst@gmail.com> - 2015-10-24 21:26 -0700
      Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-25 10:17 +0000
      Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-25 18:13 -0500
        Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-25 21:35 -0400
          Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-26 14:28 -0500
            Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-26 17:46 -0400
              Re: the FORTH computer language Peter Flass <peter_flass@yahoo.com> - 2015-10-26 17:49 -0400
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:29 -0500
              Re: the FORTH computer language Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-27 19:55 +0000
  Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-21 11:45 +0100
    Re: the FORTH computer language Whiskers <catwheezel@operamail.com> - 2015-10-21 12:34 +0000
      Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-21 14:36 +0100
    Re: the FORTH computer language David Hume <David.Hume@example.com> - 2015-10-22 09:38 +0100
      Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-22 11:07 +0100
        Re: the FORTH computer language David Hume <David.Hume@example.com> - 2015-10-22 11:35 +0100
          Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-22 12:26 +0100
            Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-23 21:52 +0100
              Re: the FORTH computer language David Hume <David.Hume@example.com> - 2015-10-23 23:16 +0100
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-24 00:21 +0100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-24 13:23 +0000
                Re: the FORTH computer language Stan Barr <plan.b@bluesomatic.org> - 2015-10-24 15:25 +0000
                Re: the FORTH computer language Morten Reistad <first@last.name.invalid> - 2015-10-24 22:37 +0200
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-25 13:30 +0000
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-25 13:30 +0000
                Re: the FORTH computer language Stan Barr <plan.b@bluesomatic.org> - 2015-10-25 15:53 +0000
                Re: the FORTH computer language Stan Barr <plan.b@bluesomatic.org> - 2015-10-25 16:08 +0000
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-26 12:08 +0000
                Re: the FORTH computer language Stan Barr <plan.b@bluesomatic.org> - 2015-10-26 16:24 +0000
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-24 16:26 +0100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-25 13:30 +0000
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-25 16:33 +0000
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-26 12:03 +0000
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 06:49 -0700
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 07:02 -0700
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 07:18 -0700
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 07:28 -0700
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 07:39 -0700
                Re: the FORTH computer language pechter@S20.pechter.dyndns.org (William Pechter) - 2015-10-26 16:25 +0000
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-26 14:36 -0500
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-26 17:41 -0400
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:26 -0500
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-27 22:47 -0400
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-27 12:22 +0000
                Re: the FORTH computer language Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-10-27 09:03 -0600
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:38 -0500
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-27 08:43 -0700
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:43 -0500
                Re: the FORTH computer language hankvc@blackhole.lostwells.org (Hank) - 2015-10-28 19:05 +0000
                Re: the FORTH computer language "78lp" <78lp@nospam.com> - 2015-10-28 16:08 +1100
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-28 05:43 -0700
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-27 15:37 -0500
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-27 18:48 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-28 12:58 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-28 08:15 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-29 13:55 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:37 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-30 04:58 +1100
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 12:19 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-28 12:58 +0000
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-28 11:08 -0700
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-28 18:46 +0000
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-28 17:58 -0400
                Re: the FORTH computer language David Hume <David.Hume@example.com> - 2015-10-28 22:04 +0000
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-28 17:39 -0500
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-29 00:13 -0400
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-28 22:52 -0600
                Re: the FORTH computer language "78lp" <78lp@nospam.com> - 2015-10-29 15:54 +1100
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-28 16:47 -0600
                Re: the FORTH computer language Walter Bushell <proto@panix.com> - 2015-11-04 12:04 -0500
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-29 05:54 +1100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-29 13:55 +0000
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 07:21 -0700
                Re: the FORTH computer language Andrew Swallow <am.swallow@btinternet.com> - 2015-10-29 16:48 +0000
                Re: the FORTH computer language JimP <solosam90@gmail.com> - 2015-10-29 14:47 -0500
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 15:09 -0700
                Re: the FORTH computer language Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 17:19 +0000
                Re: the FORTH computer language Greymaus <mausg@mail.com> - 2015-10-29 18:18 +0000
                Re: the FORTH computer language Ahem A Rivet's Shot <steveo@eircom.net> - 2015-10-29 18:02 +0000
                Re: the FORTH computer language Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 19:37 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 11:28 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:42 -0600
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-29 14:49 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:57 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-30 08:39 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-31 13:22 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-31 09:36 -0600
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-31 09:47 -0700
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-01 15:14 +1100
                Re: the FORTH computer language David Wade <dave.g4ugm@gmail.com> - 2015-11-01 16:38 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-02 12:58 +1100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-11-02 13:17 +0000
                Re: the FORTH computer language "Osmium" <r124c4u102@comcast.net> - 2015-11-02 10:05 -0600
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-31 15:23 +1100
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:44 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language hancock4@bbs.cpcn.com - 2015-10-30 12:25 -0700
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-31 13:22 +0000
                Re: the FORTH computer language David Wade <dave.g4ugm@gmail.com> - 2015-11-01 16:32 +0000
                Re: the FORTH computer language "Osmium" <r124c4u102@comcast.net> - 2015-11-01 11:03 -0600
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-11-01 12:48 -0500
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-11-02 13:17 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-03 07:16 +1100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-11-03 12:55 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-04 08:07 +1100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-11-04 13:52 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-05 08:52 +1100
                Re: the FORTH computer language Morten Reistad <first@last.name.invalid> - 2015-11-05 07:48 +0100
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-11-06 06:31 +1100
                Re: the FORTH computer language hancock4@bbs.cpcn.com - 2015-11-02 07:34 -0800
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-11-01 23:55 -0800
                Re: the FORTH computer language hancock4@bbs.cpcn.com - 2015-11-02 07:40 -0800
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-11-02 14:59 -0600
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-30 05:08 +1100
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-28 13:15 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-29 13:55 +0000
                Re: the FORTH computer language Andrew Swallow <am.swallow@btinternet.com> - 2015-10-29 16:47 +0000
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-29 07:29 -0700
                Re: the FORTH computer language "gareth" <no.spam@thank.you.invalid> - 2015-10-29 14:47 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:53 -0600
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-29 15:24 -0500
                Re: the FORTH computer language scott@slp53.sl.home (Scott Lurndal) - 2015-10-28 13:20 +0000
                Re: the FORTH computer language hankvc@blackhole.lostwells.org (Hank) - 2015-10-28 18:54 +0000
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-28 12:47 -0700
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-28 15:46 -0400
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-28 12:50 -0700
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-29 13:55 +0000
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 08:33 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-30 04:55 +1100
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-31 15:18 +1100
                Re: the FORTH computer language pechter@S20.pechter.dyndns.org (William Pechter) - 2015-10-29 19:34 +0000
                Re: the FORTH computer language Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-29 19:43 +0000
                Re: the FORTH computer language pechter@S20.pechter.dyndns.org (William Pechter) - 2015-10-29 20:04 +0000
                Re: the FORTH computer language hancock4@bbs.cpcn.com - 2015-10-29 13:28 -0700
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language pechter@S20.pechter.dyndns.org (William Pechter) - 2015-10-30 16:43 +0000
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-29 15:37 -0400
                Re: the FORTH computer language rpw3@rpw3.org (Rob Warnock) - 2015-11-03 06:56 +0000
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-29 13:55 +0000
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-29 15:47 -0400
                Re: the FORTH computer language Lawrence Statton <lawrence@senguio.mx> - 2015-10-29 14:14 -0600
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-30 20:50 -0400
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-30 13:54 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-28 16:05 +1100
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-28 15:52 -0400
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-29 12:29 +1100
                Re: the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-29 15:51 -0400
                Re: the FORTH computer language Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-10-26 09:05 -0600
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-26 14:44 -0500
                Re: the FORTH computer language hancock4@bbs.cpcn.com - 2015-10-27 10:28 -0700
                Re: PDP-11, was the FORTH computer language John Levine <johnl@iecc.com> - 2015-10-26 17:19 +0000
                Re: PDP-11, was the FORTH computer language Rich Alderson <news@alderson.users.panix.com> - 2015-10-26 17:02 -0400
                Re: PDP-11, was the FORTH computer language pechter@S20.pechter.dyndns.org (William Pechter) - 2015-10-29 19:40 +0000
                Re: the FORTH computer language "Charles Richmond" <numerist@aquaporin4.com> - 2015-10-26 14:34 -0500
                Re: the FORTH computer language Huge <Huge@nowhere.much.invalid> - 2015-10-26 21:22 +0000
                Re: the FORTH computer language Morten Reistad <first@last.name.invalid> - 2015-10-27 07:00 +0100
                Re: the FORTH computer language timcaffrey420@gmail.com - 2015-10-27 10:15 -0700
                Re: the FORTH computer language scott@slp53.sl.home (Scott Lurndal) - 2015-10-27 20:09 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-27 06:42 +1100
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 15:22 -0700
                Re: the FORTH computer language Quadibloc <jsavard@ecn.ab.ca> - 2015-10-26 15:23 -0700
                Re: the FORTH computer language Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2015-10-27 19:55 +0000
                Re: the FORTH computer language Michael Black <et472@ncf.ca> - 2015-10-27 16:09 -0400
                Re: the FORTH computer language Elliott Roper <nospam@yrl.co.uk> - 2015-10-25 19:31 +0000
                Re: the FORTH computer language jmfbahciv <See.above@aol.com> - 2015-10-26 12:03 +0000
                Re: the FORTH computer language scott@slp53.sl.home (Scott Lurndal) - 2015-10-26 13:10 +0000
                Re: the FORTH computer language "Rod Speed" <rod.speed.aaa@gmail.com> - 2015-10-27 06:45 +1100
                Re: the FORTH computer language Stan Barr <plan.b@bluesomatic.org> - 2015-10-24 07:03 +0000

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