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Member Since 11 Jun 2016
OFFLINE Last Active Today, 3:49 PM

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In Topic: TM990 / 189

Wed Feb 13, 2019 2:10 AM

I like the idea of using the housing of the TI-59 calculator as a terminal to the board.

a real ti59 is not used, but it is the tms9901 outputs that drive the display and manage the keyboard in multiplex...

In Topic: TM990 / 189

Mon Feb 11, 2019 12:02 AM

in internet the FWs are the correct checksum for U32 = 7546 (tms2716) and U33 = D806 (tms2532).
for programming the U33 (tms2532) with willem or tl866 like (tms2732), an adapter must be used to make the pins compatible, in this way.
u33 adapter
tms 2532       tms 2732
21       vpp     20
20       cs       18
19       a10     19
18       a11     21
for the U32  attention because it has three power supplies (+5, -5, +12) you can use a D2716 (5 volt power supply) by modifying the PCB or using an adapter
u32 adapter
tms2716 (-5 volt)      D2716 ( 5 volt )
19  vdd                      19  n.c.
21  vbb                      21 connect +5
20  a10                      19
                                  20 connect gnd

In Topic: TM990 / 189

Fri Feb 8, 2019 9:01 AM

nobody has the FW for the eprom u32 and u33 !

In Topic: Tomy Tutor...anyone?

Thu Feb 7, 2019 3:12 AM


Finally picked up a 3D printer, so finishing off this project:




And back together after some paint:





great job !

In Topic: TM990 / 189

Tue Feb 5, 2019 9:52 AM

ok thanks, I followed the instructions of the databook, with the original or copied eprom works, with the dedicated fw the micro remains locked.