{"id":1284,"date":"2015-11-17T12:19:17","date_gmt":"2015-11-17T12:19:17","guid":{"rendered":"http:\/\/www.sydneysmith.com\/wordpress\/?p=1284"},"modified":"2017-05-14T01:29:05","modified_gmt":"2017-05-14T01:29:05","slug":"hp67-merged-keycodes-state-info","status":"publish","type":"post","link":"https:\/\/www.sydneysmith.com\/wordpress\/1284\/hp67-merged-keycodes-state-info\/","title":{"rendered":"HP67 Merged Keycodes – State Info"},"content":{"rendered":"

As you key in a merged keycode the calculator has to remember which keys led up to this point. After all, pressing the [0] key produces very different results if it was preceded by [f], [g], [h], [STO], [RCL], [STO] [+], and so on. Here’s how it keeps track: <\/p>\n

The “state” information (where it is up to) is stored in a combination of the S register bits and the M1[x] nibbles like this:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
keys<\/td>\ns<\/td>\nm1<\/td>\nnotes<\/td>\n<\/tr>\n
GTO<\/td>\n7,10,13<\/td>\n0d0<\/td>\n<\/td>\n<\/tr>\n
GTO f<\/td>\n4,6,10,13<\/td>\n0d0<\/td>\n<\/td>\n<\/tr>\n
GTO .<\/td>\n7,8,10,13<\/td>\nff0<\/td>\n<\/td>\n<\/tr>\n
GTO . n<\/td>\n7,8,10,13<\/td>\nfn0<\/td>\n<\/td>\n<\/tr>\n
GTO . n n<\/td>\n7,8,10,13<\/td>\nnn0<\/td>\n<\/td>\n<\/tr>\n
GTO [0-9,A-E,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
GTO f [A-E]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
GTO . n n n <\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
DSP<\/td>\n13<\/td>\n060<\/td>\n<\/td>\n<\/tr>\n
DSP [0-9,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
f<\/td>\n4,6,13<\/td>\n000<\/td>\n<\/td>\n<\/tr>\n
f GSB<\/td>\n7,13<\/td>\n0b0<\/td>\n<\/td>\n<\/tr>\n
f LBL<\/td>\n7,13<\/td>\n0f0<\/td>\n<\/td>\n<\/tr>\n
f others<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
f GSB [0-9,A-E,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
f LBL [0-9,A-E]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
g<\/td>\n4,6,7,13<\/td>\n000<\/td>\n<\/td>\n<\/tr>\n
g GSB f<\/td>\n6,7,13<\/td>\n0a0<\/td>\n<\/td>\n<\/tr>\n
g LBL f<\/td>\n6,7,13<\/td>\n0e0<\/td>\n<\/td>\n<\/tr>\n
g GSB f [A-E]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
g LBL f [A-E]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
g others<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
STO<\/td>\n4,7,13<\/td>\n090<\/td>\n<\/td>\n<\/tr>\n
STO –<\/td>\n4,7,8,13<\/td>\n0a0<\/td>\n<\/td>\n<\/tr>\n
STO +<\/td>\n4,7,8,13<\/td>\n0c0<\/td>\n<\/td>\n<\/tr>\n
STO *<\/td>\n4,7,8,13<\/td>\n0e0<\/td>\n<\/td>\n<\/tr>\n
STO \/<\/td>\n4,7,8,13<\/td>\n080<\/td>\n<\/td>\n<\/tr>\n
STO [0-9,A-E,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
STO – [0-9,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
STO + [0-9,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
STO * [0-9,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
STO \/ [0-9,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
RCL<\/td>\n4,10,13<\/td>\n070<\/td>\n<\/td>\n<\/tr>\n
RCL [0-9,A-E,Sum,(i)]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h<\/td>\n4,6,8,13<\/td>\n000<\/td>\n<\/td>\n<\/tr>\n
h SF<\/td>\n6,8,13<\/td>\n080<\/td>\n<\/td>\n<\/tr>\n
h CF<\/td>\n6,8,13<\/td>\n060<\/td>\n<\/td>\n<\/tr>\n
h F?<\/td>\n6,8,10,13<\/td>\n050<\/td>\n<\/td>\n<\/tr>\n
h STI<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h RCI<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h SF [0-3]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h CF [0-3]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h F? [0-3]<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
h others<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n
others<\/td>\n<\/td>\n<\/td>\nfinal<\/td>\n<\/tr>\n<\/table>\n

When you press the [0] key it needs to check the S register and M1[x] to see what you mean.<\/p>\n

There’s more to untangle yet but here’s a trace\/listing for prefixes then [0]<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

As you key in a merged keycode the calculator has to remember which keys led up to this point. After all, pressing the [0] key produces very different results if it was preceded by [f], [g], [h], [STO], [RCL], [STO] [+], and so on. Here’s how it keeps track:<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[16,5,3],"tags":[33],"_links":{"self":[{"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/posts\/1284"}],"collection":[{"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/comments?post=1284"}],"version-history":[{"count":3,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/posts\/1284\/revisions"}],"predecessor-version":[{"id":1287,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/posts\/1284\/revisions\/1287"}],"wp:attachment":[{"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/media?parent=1284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/categories?post=1284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sydneysmith.com\/wordpress\/wp-json\/wp\/v2\/tags?post=1284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}