SuperCart Construction

[GDMike]

Yup. I got that... just took me a couple minutes to see it.

Thank you.

[GDMike]

If you have a Supernotes Express Cartridge I've changed out the screw holding the PCB to the case. If you need this hardware please let me know. There is a possibility of the steel screw scratching the surface of the front of the port of the computer.

[GDMike]

I have 2 Supernotes carts ready if anyone wants one. Shoot me a message

[GDMike]

Qty change, I've got 4 built today, but only 1 is left.

Ty

[+TheBF]

Has anyone ever used this chip in a Supercart?

I has an 8 byte clock and calendar built in. I used it in an industrial product in the 90s.

 

https://www.futurlec.com/Datasheet/STMicro/M48T08.pdf

[GDMike]

I sure wish I knew how to add it into my SuperNotes PCB.

Unfortunately, I don't know how to address these but I'm trying to learn. I've also got personal issues keeping me at Bay so my time is limited on how it's spent these days.

Edited May 14, 2020 by GDMike

[Asmusr]

On 4/25/2020 at 10:17 PM, TheBF said:

Has anyone ever used this chip in a Supercart?

I has an 8 byte clock and calendar built in. I used it in an industrial product in the 90s.

 

https://www.futurlec.com/Datasheet/STMicro/M48T08.pdf

Before Shapchat we had the snaphat. ?

[+TheBF]

3 minutes ago, Asmusr said:

Before Shapchat we had the snaphat. ?

You lost me  ?

[Asmusr]

4 minutes ago, TheBF said:

You lost me  ?

[+TheBF]

?

 

LOL I missed that.   

[GDMike]

Nope. I'm wondering if I have one of those RTC chips. I'll have to dig around. Now you're supposed to say, "I Know how to make that work in the supercart" 

Lol. Well it's a great idea. 

[+TheBF]

10 hours ago, GDMike said:

Nope. I'm wondering if I have one of those RTC chips. I'll have to dig around. Now you're supposed to say, "I Know how to make that work in the supercart" 

Lol. Well it's a great idea. 

I just ordered a card and an old cartridge this week. I really like running Camel99 Forth with the supercart version on Classic99.

When it boots and says "24,008 FREE" it makes me happy.  (we are an easy to please lot aren't we)

 I found 3 of these chips while unpacking some boxes.  They are only 8K bytes but that is all I really want.  We shall see if the batteries are still good.

I will let you know how it goes. I already have the Forth code to access the clock and calendar.

[+TheBF]

On 4/25/2020 at 4:17 PM, TheBF said:

Has anyone ever used this chip in a Supercart?

I has an 8 byte clock and calendar built in. I used it in an industrial product in the 90s.

 

https://www.futurlec.com/Datasheet/STMicro/M48T08.pdf

I can confirm that this line of 8K battery RAMs is a drop-in chip for the Super Cart board from Arcade Shopper.

I didn't install the battery holder since the chip has a built in battery. Of course I didn't install the switches either and the open positions work with the MK48T18,

I might change R2 to reduce the brightness of the LED should I choose to install a LED.

But it is so neat to have an extra 8K RAM in the old machine.

 

Thank you Arcade Shopper.

 

 

[GDMike]

That's pretty cool!

[GDMike]

M48T08 on order. as Id like to try it out.

 

 

 

[+TheBF]

3 hours ago, GDMike said:

M48T08 on order. as Id like to try it out.

 

 

 

Here is the driver I wrote for Camel Forth.  Most of it looks ok for Turbo Forth except the RSHIFT and LSHIFT. 

 

You can replace those with multiple 2* for LSHIFT  and 2/  for RSHIFT .

So 4 LSHIFT  would be  2* 2* 2* 2* and 4 RSHIFT would 2/ 2/ 2/ 2/

 

\ CLOCK.MAX    access realtime clock in maxforth cpu           21DEC92 FOX
\ Ported from MaxForth to ANS/ISO Forth for CAMEL99 Forth      30MAY2020 BFox
\ MK48T18 8K battery ram with CLOCK and calendar in SUPER CART (>6000)

HERE
HEX
    6FF8   CONSTANT ctrl ( base address & control register of clock)
  ctrl 1 + CONSTANT sec
\ ctrl 2 + CONSTANT min
\ ctrl 3 + CONSTANT hr
  ctrl 4 + CONSTANT day
  ctrl 5 + CONSTANT date
\ ctrl 6 + CONSTANT month
\ ctrl 7 + CONSTANT yr

.( bcd conversions)
HEX
: BCD>S ( bcd -- n )
       DUP  0F AND
       SWAP F0 AND
       4 RSHIFT 0A * + ;

DECIMAL
: S>BCD ( n -- bcd )  10 /MOD  4 LSHIFT + ;

: BCD@  ( adr -- c)   C@ BCD>S ;      \ fetches BCD # and converts it

: clkwrt ( --) 80 ctrl C! ;    \ set write bit
: clkrd  ( --) 40 ctrl C! ;    \ set read bit stops updates
: clkon  ( --)  0 ctrl C! ;    \ clr R/W, resume updates
: ##  ( n -- ) 0 <# # # #> TYPE ;
DECIMAL
: DAY@  ( -- c ) clkrd day C@  07 AND clkon ;

: TIME@  ( -- sec min hr) \ can be used to compute total seconds
       clkrd
       sec BCD@
       sec 1+ BCD@
       sec 2+ BCD@    \ read the bytes
       clkon ;

: DATE@  ( -- date month yr)
       clkrd                           ( stop updates )
       date BCD@  date 1+ BCD@  date 2+ BCD@  ( read the bytes )
       clkon ;

: .TIME  ( -- ) TIME@  ## ." :" ## ." :" ## ;
HEX
: TIME! ( hr min sec -- )
       clkwrt               \ enable write-thru
       S>BCD 7F AND sec C!  \ store sec. & protect the STOP  bit
       S>BCD sec 1+ C!      \ store minutes
       S>BCD sec 2+ C!      \ store hours
       clkon ;              \ disable writes

: DATE! ( yr month date  -- )
       clkwrt
       0 day C!             \ starts the oscillator
       S>BCD date C!
       S>BCD date 1+ C!
       S>BCD date 2+ C!     \ store values
       clkon ;

                 \      YR       MM       DD
: .DATE  ( -- )  DATE@  ## ." /" ## ." /" ## ;

HERE SWAP - DECIMAL . .( bytes)

 

[GDMike]

I'll need to run this in camel Forth when the chip comes in. I can't use it in tf because no access to port.

I do have my cart populated with a ea Grom though.

I should be able to load camel Forth when I find a copy of it.

Edited November 16, 2020 by GDMike

[+TheBF]

This version is my last release.

 

https://atariage.com/forums/applications/core/interface/file/attachment.php?id=754021

[GDMike]

I was just reading the code.

Thx

[GDMike]

Could this MK48T08 piggy back on a 32K sram and the clock functions be accessed?

 

Edited November 16, 2020 by GDMike

[+TheBF]

11 hours ago, GDMike said:

Could this MK48T08 piggy back on a 32K sram and the clock functions be accessed?

 

Not by just piggy-backing it. You would need to disable some of the address lines on the 32K RAM or use a decoder chip.

[GDMike]

Good thing all my boards used a socket for 32K sram. Shoosh..

 

[GDMike]

On 11/16/2020 at 7:52 AM, TheBF said:

Not by just piggy-backing it. You would need to disable some of the address lines on the 32K RAM or use a decoder chip.

Hmm. I removed the 32K sram from my Supercart, and I plugged in my MK48T08 that I just received and it's returning 0s.

Just for the purpose of orienting which bank is 0, I plugged in an 8K SRAM and determined that both switches have to be up. The 8K returned good data along with the 32K I tried earlier, but the new MK48T08 returned 0s again.

Any ideas? 

Oh, BTW. I'm lighting a fire up under CAMEL FORTH. Just converting to real floppies, but I'll be running it later. Whohoo, what else better to do on FORTH day.

Edited November 21, 2020 by GDMike

[Stuart]

So you've set the switches such that you can write to the 8K RAM and read the same data back?

 

Worth checking the supply voltage on pin 28 of the 48T08 when its plugged in and the computer's on. If it's less than ~4.75V then the device goes into write protect mode where you also can't read from it (but the normal 8K RAM would still work). The supply voltage is going to be less than the computer +5V supply anyway due to the diode in the battery backup circuit. If the voltage is low, might be worth just bending pin 28 out of the socket and connecting direct to +5V on the PCB and see if it then works.

[GDMike]

There's an L.E.D. also on that board, not sure if it's stealing juice. But interesting note for checking the voltage coming in. I'll have to solder in two test wires as the pins on the MK48T08 aren't accessible.

Ty Mr. Stuart

 

Edited November 22, 2020 by GDMike