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Description
The Toshiba T9769 is a chipset called MSX-ENGINE with the following features:
- Main CPU: Toshiba TMPZ84C00A Zilog Z80 (clone) with a clock speed of 3,58 MHz (MSX2; switchable to 5.36 MHz on Panasonic MSX2+ machines)
- Programable Sound Generator: Toshiba T7766A (AY-3-8910 compatible)
- PPI chip: Toshiba TMP82C55A (Intel i8255 clone)
- MSX1 and MSX2 functions (MSX2 computers)
- MSX2+ functions (MSX2+ computers)
- dimensions: 31.45 × 31.45 x 4.1 mm (QFP144 package)
Pinout
T9769 revisions
This chipset exists in four versions (T9769 and 3 revisions, labelled A, B and C), plus a prequel (T9763).
For Panasonic and Sanyo MSX2+ computers the specific revision used changed over time. That's why the table below indicates two possible revisions for some machines.
| Generation | Model | Used chipset |
|---|---|---|
| MSX2 | Panasonic FS-A1FM | T9769 |
| MSX2 | Sakhr AX-370 | T9769B |
| MSX2 | Sanyo PHC-55FD2 | T9763 |
| MSX2+ | Panasonic FS-A1FX | T9769A or T9769B |
| MSX2+ | Panasonic FS-A1WSX | T9769B or T9769C |
| MSX2+ | Panasonic FS-A1WX | T9769A or T9769B |
| MSX2+ | Sanyo PHC-35J | T9769A or T9769B |
| MSX2+ | Sanyo PHC-70FD | T9769A or T9769B |
| MSX2+ | Sanyo PHC-70FD2 | T9769A or T9769B |
| MSX Turbo R | Aucnet NIA-2001 | T9769C |
| MSX Turbo R | Panasonic FS-A1GT | T9769C |
| MSX Turbo R | Panasonic FS-A1ST | T9769C |
Differences between revisions
The differences between all the versions of the T9769 chip are not yet known, they could be related to problems with the TC8566AF disk drive controller and its evolution in Turbo R where the disk rom is 'merged' with the MSX-DOS2 rom. One difference is that the VDP I/O delay is different for these versions. For the C revision it is 1 cycle and for the others it is 2 cycles. See https://github.com/openMSX/openMSX/issues/563 and https://github.com/openMSX/openMSX/issues/989
On the Sanyo PHC-55FD2, the disk drive controller is not a TC8566AF from Toshiba, but a Western Digital 2793 (TMS2793NL). There are probably differences between the T9763 chip and its sequels.
Upgrade to 512kB RAM
An easy way to upgrade any computer using the T9769 chip to 512kB RAM is:
- pull pins 51 and 52, connect to VCC (5V)
- Pull pin 50, mark as /CAS2
- Pull pin 47, mark as A8
Use 4x44256 chips and connect to the bus
More info: Tabajara Labs
