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Memory as for the person who thinks of that it increases please refer in the substance of .MSX2/2+ which collected the technical information which is necessary to the case where memory is increased in MSX2/2+ which loads S1985. Furthermore, the inquiry to the manufacturer modesty concerning this case. 1995.5.2 Fujimoto 昌 interest (NIFTY-ID: MCN00585) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - S1985 (MSX-SYSTEMII) S1985, with LSI which was developed in one for MSX2, by the fact that it constitutes with LSI of Z80CPU and V9938, can actualize MSX2 with the little part. With the favor of S1985, very cheap MSX2 appeared in comparison with early MSX2. 1. Functional summary Slot as for control slot 0, slot 3 simultaneously open-ended The control of DRAM (lead/read, light/write and refreshment) Mapper function is possible to 512KB MSX2 real time clock built-in of standard VDP selection signal Control of keyboard Control of printer (bidirectional mode correspondence of printer) Kanji ROM selection signal SSG (PSG) built-in CMOS (100 pin plastic flat packages)
3. Memory, slot control-related signal Terminal terminal name Input-output capability
3 MA18/KBDIR out [matsupaadoresu] or keyboard bus direction
4 MA17 out [matsupaadoresu]
5 MA16 out [matsupaadoresu]
6 MA15 out [matsupaadoresu]
7 MA14 out [matsupaadoresu
*28 ~RSEL in When expanding the slot, NAND logic of [ato] ゙ less AB8~AB13 The signal which you take input (the [hu] ゚ [ruatsuhu] ゚ resistance attaching)
39 ~RAS out The RAS signal of DRAM
41 MPX out Multiplex signal of DRAM address
42 ~CAS out The CAS signal of DRAM
43 ~WE out The WE signal of DRAM
44 ~CS1 out ROM selection 4000H~7FFFH signal
45 ~CS2 out ROM selection 8000H~BFFFH signal
46 ~CS12 out ROM selection 4000H~BFFFH signal
47 ~SLT0/00 out The selection signal of SLOT#0 or SLOT#00
48 ~SLT01 out The selection signal of SLOT#01
49 ~SLT02/~CS0 out Selection of SLOT#02 or ROM selection 0000H~3FFFH signal
50 ~SLT03/~CS01 out Selection of SLOT#03 or ROMselection 0000H~7FFFH signal
51 ~SLT1 out The selection signal of SLOT#1
52 ~SLT2 out The selection signal of SLOT#2
53 ~SLT3/30 out The selection signal of SLOT#3 orSLOT#30
54 ~SLT31 out The selection signal of SLOT#31
55 ~SLT32 out The selection signal of SLOT#32
56 ~SLT33 out The selection signal of SLOT#33
73 ~X0 in Keyboard return signal
74 ~X1 in Keyboard return signal
75 ~X2 in Keyboard return signal
76 ~X3 in Keyboard return signal
77 ~X4 in Keyboard return signal
78 ~X5 in Keyboard return signal
79 ~X6 in Keyboard return signal
80 ~X7 in Keyboard return signal
4. Selection of function
S1985 when resetting latching the keyboard return signal, selecting function It does. The function which is selected is as follows. When you look at actually MSX2/2+, using the diode, wiring and programming.
Terminal name [rehe] ゙ [ru] function
~X2 L DRAM [rihuretsushiyumoto] ゙ becomes RAS only refreshment mode.
H DRAM [rihuretsushiyumoto] ゙ becomes [hidonrihuretsushiyumodo].
~X5 L The MA18/KBDIR terminal outputs the MA18 signal.
H The MA18/KBDIR terminal outputs the KBDIR signal.
~X6 L Keyboard kana JIS arrangement
H Keyboard kana 50 sound arrangement
~X7 L VDP [rito] 1WAIT is required at the time of ゙/the light/write.
H VDP [rito] 1WAIT is not required at the time of ゙/the light/write.
~X3 L ~SLT03/~CS01, the ~SLT02/~CS0 terminal ~SLT03,outputs the ~SLT02 signal.
H ~SLT03/~CS01, the ~SLT02/~CS0 terminal ~CS01,outputs the ~CS0 signal.
~X1 L The slot 0 is expanded.
H If it is ~X3=1, the slot 0 is not expanded.
* About the MA18/KBDIR terminal
In order mapper function to 512KB to make possible, MA18 is necessary. For this when resetting in order in ~X5 to become [rehe] ゙ [ru] L, it is necessary to wire to program.
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The 512KB memory addition of MSX2/2+ itself which
As for the .1MB expansion storage cartridge which is
Fujimoto of the writer of the 1MB expansion storage
cartridge, without remodelling the substance it is to
produce in order to increase the memory of MSX2 but,
when the DOS2 cartridge and the other cartridge are
used, there are times when it cannot designate
memory addition as because the slot is already used.
It tried thinking of that it builds in increases the
mapper memory of 512KB in MSX2/2+ itself which
uses S1985 then. As for S1985, by the fact that the
pseudo static ram of .512KB which builds in the
mapper register which can be managed is used, 3 with
just IC does memory addition to 512KB. This time, it
introduces concerning the remodelling example in the
case of SONY HB-F1XDJ. You think that even with in
case of the other type it becomes reference. 1.
Use part
HM658512 ×1 512KB pseudo static ram
74HC02 ×1 NOR gate IC
74HC32 ×1 OR gate IC
1S1588×1 Switching diode
0.1μF ×1 Ceramic condenser
10KΩ ×1 1/8W resistance
Wire AWG28 for [waiyaratsupingu] (0.32mm)
2. Schematic
HM658512
＿＿＿＿
No. No.｜
Z80 +5V 11------------------32｜Vcc
Z80 GND 29------------------16｜GND
Z80 D0 14------------------13｜D0
Z80 D1 15------------------14｜D1
Z80 D2 12------------------15｜D2
Z80 D3 8------------------17｜D3
Z80 D4 7------------------18｜D4
Z80 D5 9------------------19｜D5
Z80 D6 10------------------20｜D6
Z80 D7 13------------------21｜D7
Z80 A0 30------------------12｜A0
Z80 A1 31------------------11｜A1
Z80 A2 32------------------10｜A2
Z80 A3 33------------------ 9｜A3
Z80 A4 34------------------ 8｜A4
Z80 A5 35------------------ 7｜A5
Z80 A6 36------------------ 6｜A6
Z80 A7 37------------------ 5｜A7
Z80 A8 38------------------27｜A8
Z80 A9 39------------------26｜A9
Z80 A10 40------------------23｜A10
Z80 A11 1------------------25｜A11
Z80 A12 2------------------ 4｜A12
Z80 A13 3------------------28｜A13
S1985 MA14 7------------------ 3｜A14
S1985 MA15 6------------------31｜A15
S1985 MA16 5------------------ 2｜A16
S1985 MA17 4------------------30｜A17
S1985 MA18/KBDIR 3------------------ 1｜A18
Z80 ~WR 22------------------29｜~WE
+-------22｜~CE
| +---24｜~OE/~RFSH
| | ｜
| | ￣￣￣￣￣￣
| +--------------+
+--------------+ |
＿ | |
S1985 ~SLT30 53--+----------------o| | | |
| |32)o-+ |
| ＿ +-o| | |
+-o| | | ￣ |
|02)-+ ＿ | |
Z80 ~RD 21----o| | +-| | | ＿ |
￣ )32)-|--| | |
＿ +-| | | )02)o-----+
Z80 ~RFSH 28----o| | | ￣ +--| |
|02)-+ | ￣
Z80 ~MERQ 19----o| | |
￣ |
＿ |
Z80 ~BUSACK 23----o| | |
|02)--------+
+-o| |
| ￣
=
In case of HB-F1XD, it means that the baseplate is
different more or less but, the basic point is the same.
The point where it is different is about to use ~SLT33
as a signal of the memory slot. The pin numbering of
~SLT33 of S1985 is 56. 3. Explanation in schematic
The latest memory addition, in order to handle the
address of .512KB which uses the 512KB pseudo
static ram, has used MA14~MA18 of A0~A13 and S
1985 of Z80. As for the pseudo static ram, as for
each function of the package and the pin, it is identical
excluding usual SRAM and part. But, the memory
circuit inside is to be DRAM. In other words if you see
on the side which is used, it is method of using which
is not different from SRAM so should have been done
but, above being DRAM, the refreshment becomes
necessary. Though the refreshment is very simple in
comparison with DRAM.
The operation of HM658512
~CE ~OE/~RFSH ~WE Operation
L L H Read
L X L Write
H L X Refresh
H H X Standby
The refreshment, when Z80 is ~RFSH=L AND
~MERQ=L, the signal of HM658512 has gone by the
fact that it makes ~OE/~RFSH=L and ~CE=H. This
time, as for pseudo static ram,
It is operational with automatic refreshment mode.
With this mode, using the refreshment counter inside,
you refresh the pseudo static ram. By the way, in
HB-F1XDJ, as for .PAUSE which is PAUSE and the
speed controller, making use of ~BUSREQ and
~BUSACK of Z80, the operation of Z80 one The time
it seems that is made to stop. Because of this,
~MERQ and ~RFSH of Z80 use this period It is not
possible. It is measure at the time of PAUSE state,
but, this time Z80 utilizes the fact that ~BUSACK=L is
output. At the time of ~BUSACK=L, the signal of HM
658512 .疑似 sram which it tries to make ~OE/
~RFSH=L and ~CE=H, when the period of ~OE/
~RFSH=L and ~CE=H is above 8μS, becomes self
refreshment mode. With this mode, using the
refreshment counter and the timer inside, you refresh
the pseudo static ram, automatically
Supplementation) PAUSE, ~BUSREQ of Z80, using
the ~BUSACK terminal, stopping the operation of Z80
at one time, it actualizes the speed controller. Unless
measure of the refreshment of this period is taken, the
data orientation wound of DRAM it occurs. Similar
problem occurs even with the 1MB expansion storage
cartridge which I design. But, although PAUSE state
is supported, because the effective signal has not
come out of the slot, being able to correspond to
PAUSE it is not. Also the other memory cartridge is
similar With you think, (also RAM of the DOS2
cartridge was useless) .1MB expansion storage When
using the cartridge, way PAUSE and [supikon] are not
used, the request stripe M (which it does) the m.DOS2
cartridge (RAM to be attached), also MEM768 is
similar. RAM which is built in to XDJ the fact that it is all
right even in PAUSE state, during PAUSE period
giving the ~MERQ signal and refresh address from the
custom tip/chip, seems like because it does the
refreshment of DRAM.
The disassembly procedure of 4.HB-F1XDJ It
disassembles with procedure below. It will classify the
screw which you remove, the classified by group.
Because the assembly does with the procedure of
opposite to disassembly, please remember the thing
when disassembling. Substance screw 6 it is on
reverse side is removed You remove above the
substance. This time, wiring of [supikon] and running
fire in substance baseplate with connector Because
3 places it is connected, this is removed The
keyboard is removed. Because the film condition
cable is used, as for treatment politely The sealed
cover which is on the baseplate of the substance is
removed Power source section the connector and
the battery connector are removed from the baseplate.
The power source connector of FDD and the
connector of 34P are removed. The screw which
has stopped FDD unit is removed, (3 places) In the
radiator (aluminum plate) you have stopped three
terminal regulator which is on the left side of the
baseplate The screw of the leaf spring is removed
(1 places). You have stopped radiator (aluminum
plate) in the baseplate The screw is removed (2
places). The screw (black) which has stopped [
riasurotsuto] is removed, (2 places) The screw (
black) which has stopped the RCA pin of VIDEO and
AUDIO output is removed, (1 places) The screw
which has stopped the baseplate is removed, (5
places) 2 floor building has stopped the screw (
black) which the baseplate is removed, (1 places) You
can remove the sealed board and the baseplate at
above. It will handle the baseplate which you remove
carefully. Looking at the baseplate of HB-F1XDJ, you
tried collecting the fact that it is understood. The
baseplate is both sides, but, as for pattern of the
component side most unused. The solder side it
wires at 2 layer. S1985 was mounted on reverse
side of the baseplate.
MA14~MA18/KBDIR had become the unused pin.
-> From the place where the memory mapper of
64KB is effective, as for the mapper control of DRAM
It is not S1985, you think as the thing which is built in
on custom tip side. [kibodoritan] as for the signal
when resetting ~X5 reaches H level. -> The diode
addition is needed in order to make MA18 effective.
Same as the diode which is connected to ~X1, ~X3
and ~X6 resistant array and the Q1 transistor If
it adds the diode to the collector, OK. Note) As
for the baseplate of HB-F1XDJ for decreasing cost
the lead/read which is wired in the baseplate
Processing of the line is very careless. The part which
does not have the coating of the lead wire having
exposed, unskillfulness If it does, 6~7 place there
was a part of a kind of state where it short-circuits.
Checking You think that the one which does again
to solder is better. The remodelling 5.HB-F1XDJ
(1) the memory IC which is mounted on the substance
originally is removed. μPD41464 (or the suitable item)
is mounted 2. Solder with soldering iron It inhales
with the melting, the solder dropper, or the solder
sucking/absorbing taking line, please take. Through
hole Because so it is not, you think that you can
remove IC relatively simply.
(2) adding the diode in order to make MA18 effective
Is because with the MA18/KBDIR signal of S1985
MA18 that tries becomes effective. When resetting
in order for ~X5 of S1985 to reach L level, it wires.
~X5 being connected same as the diode which is
connected to ~X1, ~X3 and ~X6 of S1985 Between
the collectors of the terminal and the Q1 transistor of
the resistant array which is the 1S1588 diode If it
solders, it is OK. Also diode direction is the same
direction. Way you do not make a mistake, Please
do.
(3) wiring HM658512 is mounted between Z80 and
S1985 in regard to circumstances of wiring and
reverse side of the baseplate densely With it did. Like
this, when it does, it can wire directly from the terminal
of Z80 and the terminal of S1985 It does, also wiring
may be short and. However, memory it is locked in the
position where printed wiring Because certain, in order
not to damage this, HM658512 is locked with the both
sides adhesive tape. As for 74HC02 and 74HC32,
nearby GND of HM658512 and +5V in place of pattern
both sides It locks with the adhesive tape. More
and more start of wiring. In order MA14~MA18 to
remove the signal from S1985, the 3~7 At a time .1
books which solder the wire of AWG28 in the pin the
solder the wire which is plated the edge Adjusting to
the child, you stop with the tape, apply the soldering
iron and solder. Piling up the solder It cannot go.
Because interval of the terminal is narrow very, please
go prudently. Solder After, pulling the wire, all right
thing and, with the terminal of the appearance it is not
short Please verify whether. When the solder ends,
is soldered in the part which stress adding In order
there is no straw, the wire is locked with the tape.
Furthermore taking the signal of ~SLT30 In order to
put out, 1 it wires even in 53 pins. As for .74HC32
where also the wiring of HM658512,74HC02,74HC32
keeps doing to order next 2 Because there is an
unused gate, please connect the unused input terminal
to GND. In addition, because direction of the gate
of 74HC02 and 74HC32 is opposite, please note. Pin
distribution After verifying the position well, please
wire.
As for the condenser of 0.1μF, the Vcc of HM658512
and inserting between GND, as [pasukon] the [ku]
The occasion where is.
(4) the ~RFSH terminal of Z80 it pulls up by the
resistance of 10KΩ. The ~RFSH terminal of Z80 at the
time of PAUSE state becomes high impedance state,
It increases. In order for logic not to become
uncertainty, it pulls up by resistance. Z80 The
resistance of 10KΩ is soldered between ~RFSH and
Vcc.
(5) assembly In a general way when wiring ends,
please verify with the tester whether just it is wired.
Especially because the short circuit related to power
source, it is fatal, please be sure to verify. When wiring
and verifying of the baseplate end, when being
disassembly, the substance is assembled with the
procedure of opposite. The keyboard has reached
the point where the terminal of film condition is poured
in the connector, but, the film In order not to snap,
please insert prudently.
(6) operation verification Please turn on the power of
MSX itself. In picture “Main RAM: 512Kbytes” it is
indicated, The [re], first stage is OK. To move the
memory test program next, the test of memory
Please do. If the result of the test ends normally, it is
OK. Reforming of memory addition Structure is
completion. It seemed the hardship way. When
starting, turning off power directly, please inspect
cause.
6. Request in regard to handling This schematic
makes the free software. Copyright is not abandoned,
but, Handling is free inside the range which the kind of
writer who is shown below recognizes. It is reluctant
thing truly, but, with the baseplate which was
remodelled on the basis of this schematic in the user a
some Damage occurring, the writer does not owe
responsibility altogether. Please utilizes the
remodelling .MSX itself is a considerable risk
beforehand in regard to acknowledgment. As for the
latest remodelling because it is the meaning which
exchanges main memory, after understanding the
sufficient verification of the baseplate of .MSX itself
which if it fails, stops starting remodelling properly and
the operation of the circuit, please do remodelling.
When there is a thing which does not understand
concerning remodelling, communication in the board
room “MSX armament construction party” of FMSX of
NIFTY or E-mail. It is possible, if we answer. 1995
May 2nd Fujimoto 昌 interest (NIFTY-ID: MCN00585)
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Publicado: Junio 02 2008, 09:50 