For Slashdot readers:

The CM-100 calculator is pictured about a quarter of the way down this page.

Regarding manuals:

Casio has a number of manuals available for download here, although many of their older ("vintage") models are not online.

I found this note but have not verified the phone number or the service:

Re: Getting a manual for Casio FX-19

From: Frank Travis

Casio Document Center has manuals (else copies of manuals) for all Casio calculators (even ones no longer made). Their phone number is (973) 252-7570. They sent me Xerox copies of the user's manual for the CM-100 (CM standing for Computer Math) calculator made in the 1980s.

Setting the time on a Casio QA-70

Setting the time on a Casio QA-300

Listing

Model	Serial Number	Notes
121-A		AC-powered four-function desktop 12-digit Nixie adjustable sliding decimal points
121-B	A 205205	AC-powered desktop 12-digit Nixie four function plus total adjustable sliding decimal points
121-E	B 705409	AC-powered desktop 12-digit vacuum-flourescent four function plus memory, percent, total and square root adjustable decimal point
121-L	B 723684	AC-powered desktop 12-digit vacuum-flourescent four function plus memory, percent and total adjustable decimal point
122-F	2118339	AC-powered desktop 12-digit vacuum-flourescent with percent, square root, reciprocal, accumulator and item counter, division with remainder, standard deviation, fractional and time calculations. With instruction manual and vinyl cover
803-MR	2114782	large LED with memory, percent, and square root
805-MR	7416908	large blue-green vacuum-flourescent with memory, percent, and square root
8E	198612	early eight-digit red LED with constant switch have manual (indicates purchase date of 20 December 1973) and AC adapter model AD-4145 (DC 4.5v center negative)
AL-8S		with case
AQ-1400		LCD calculator/clock/alarm in fold-open wallet I need a manual for this one.
AS-8D	707964 / Q 86857	desktop four function blue flourescent
AS-8E	Q 116574	desktop four function blue flourescent
AS-L	B 708624	desktop 12-digit nixie tube four-function plus memory
AZ-45F
CM-100		Computer Math calculator In box with instruction booklet
CQ-1	1744841 1767833 1954665 5061151 5785035	Combination clock/timer/alarm/calculator with a blue/green vacuum-flourescent display Uses AC adapter LR 21061 (1.4 VDC) I have five of these neat early clock/calculators, three black, one white and one red (Japanese instruction label) One of them (1767833) is missing both battery covers and another is missing the inner cover, so if anyone has a unit they wouldn't mind parting with, please let me know. You can download the instruction manual (in PDF) by clicking here (thanks to Kathrine Wasserman for the manual scan ).
CQ-81	??? 4054184 4127862	Combination clock/alarm/calculator, eight digit LCD
fx-1	206866	very early Nixie tube desktop scientific
fx-10	??? 2193419 8108737	scientific one with a zippered case
fx-11	2178375 27005286	scientific
fx-120	4574993	scientific with AC adapter 3-3128B (4.5 VDC 300 ma, outside sleeve positive)
fx-19	2206078 3769094	LED scientific one with case, instructions and AC adapter
fx-101	2363361	scientific
FX-20	3132426 9031178	Scientific (one with case)
FX-21	4117824	Scientific (with case)
FX-250HC		(new, sealed in box)
fx-31	0100603	VFD scientific with case and instruction booklet
FX-310		LCD scientific
FX-39		early LED scientific
FX-451M		solar-powered flip-open LCD scientific
FX-5000F
fx-550		ten digit LCD scientific with case and operation manual
fx-7		scientific LCD I have two of these, both with battery covers stamped 3D708A
FX-702P		Programmable calculator I have two of these, one with case and manual
FX-7000G		scientific graphing
FX-7500G		fold-open LCD scientific graphing
fx-82B		LCD scientific, auto power off
FX-82C		LCD scientific, auto power off
FX-85N		LCD scientific, solar powered, auto power off
FX-880P		Personal Computer
H-1	1K111A	eight digit blue electroflourescent LED with percent, square root and memory. with case and operation manual
H-801	(4362163) 4368648 4373008 5254817	Biolator biorhythm calculator each with case and instruction booklet This calculator is not Y2K compliant.
HL-807	0C104A	Early LCD four-function plus memory and percent (I have two of these)
HL-809		Early LCD four-function plus memory and percent uses NEC D1871C chip with original box
HL-811		LCD in original box
HQ-31		LCD calculator/clock/calendar/alarm with case and instruction booklet
HR-10	1S103A	LCD printing calculator
HS-8G		LCD solar with memory, percent and square root
JL-20		larger handheld LCD with memory, percent and square root also has adjustable decimal switches
JS-8
LC-796		"mini card" LCD calculator with memory, percent and square root with folding case, instructions and box has "RCA Records" and Nipper imprint on case
Memory 81	4558729 4655178 4655595	blue fluorescent four-function plus memory, percent and square root. two with cases, one is missing a battery cover
memory 8A	0252134	blue fluorescent with memory, percent, square root with case and original box
memory 8F	4528282 4564445	blue fluorescent with memory, percent and square root
memory 8R	4006438 4419672 4725181 4973991 4974471 7024772	blue fluorescent four-function with memory and percent one is missing the battery door
memory A-1	0154692 0022454 0622709	blue fluorescent four-function with memory, percent and square root
memory B-1	0617691	blue fluorescent four-function with memory, percent and square root with case
Mini CM-605		with case and a Japanese manual
Melody-80		musical LCD calculator/clock/alarm/stopwatch in fold-open case
Mini Memory	1046348
ML-860		LCD musical calculator
MQ-1	0164504	LCD combined clock/calculator
MQ-11B	0131968	Card Watch micro computer quartz LCD combined clock/alarm/calculator with wallet case and Operation Manual
MQ-1200		eight-digit LCD combined clock/calculator/alarm
MQ-2	2266542 3160191 3298636 3322046	LCD combined clock/calculator all have cases, one also has original box and instruction booklet
MQ-5		LCD combined clock/calculator/alarm/timer
PB-300		BASIC programmable "Personal Computer" and calculator with case
Personal I	4088557	six digit display, with case
personal-I	4088557	eight digit vacuum-flourescent display with square root and percent
personal mini	0048720 0202018 0341146 0409776 4106467 4267024 4420825	six digit display, with case
Personal M-1	0E106A 4242615 4243074	fluorescent four-function with memory, percent and square root one with box, instruction sheet and warranty card one with boxed Casio AC adapter 2-2000
Personal-mini	4078990 6434762	each with case and box, one instruction booklet
pocket mini	0132715 21053481	red LED four-function with square root
PW-60		Eight-digit LCD "Pocket Watch" calculator with box and instruction book
R-3	8 706417	12 digit vacuum flourescent printing calculator with memory, percent and square root
Root-8	21348903
SL-100B		folding solar LCD with memory, square root and percent
SL-702		early wallet-sized solar LCD
QA-10		"Time Face" LCD clock/calculator, can do time calculations
QA-100		"Time Face" LCD clock/alarm/timer/calculator, can do time calculations
SL-1200L		12-digit LCD "Time Calculations" plus square root Need instruction booklet
ST-1		Stopwatch/Calculator, 8 digit LED (same display module at the CQ-1) with case but missing keypad cover