Model T Y2K: Difference between revisions

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[[file:TRS-80_Model_100.y2k.bin]]
[[file:TRS-80_Model_100.y2k.bin]]


If your original system rom has the part number LH535618 (most will), then you can use [[FlexROM_100]] and/or [[Building a REX|REX Classic]] to install the patched ROM.<br>
Most Model 100's have a non-standard pinout for the system rom socket.<br>
Most Model 100's have a non-standard pinout for the system rom socket, so you need FlexROM_100 or something like it in order to replace it with a standard chip.
If your original system rom has the part number LH535618 (most will), then you can use [[FlexROM_100]] (optionally with [[Building a REX|REX Classic]]) to install the patched ROM.


If you have a late model without LH535618, then you can use a plain 27C256 or [[28C256_to_27C256]].
If you have a late model without LH535618, then you can use a plain 27C256, or [[FlexROM_102]] (optionally with [[Building a REX|REX Classic]]), or [[28C256_to_27C256]].


==TANDY Model 102==
==TANDY Model 102==
US<br>
:0x5A53 0x31 -> 0x32
:0x5A53 0x31 -> 0x32
:0x5A56 0x39 -> 0x30
:0x5A56 0x39 -> 0x30


[[file:TANDY_Model_102.orig.bin]]<br>
[[file:TANDY_Model_102.us.orig.bin]]<br>
[[file:TANDY_Model_102.y2k.bin]]
[[file:TANDY_Model_102.us.y2k.bin]]


You can use a plain 27C256 or a [[28C256_to_27C256]] to install the patched rom.
UK<br>
:0x5A53 0x31 -> 0x32
:0x5A56 0x39 -> 0x30
 
[[file:TANDY_Model_102.uk.orig.bin]]<br>
[[file:TANDY_Model_102.uk.y2k.bin]]
 
You can use a plain 27C256, or [[FlexROM_102]] (optionally with [[Building_a_REX|REX Classic]]), or [[28C256_to_27C256]] to install the patched rom.


==TANDY Model 200==
==TANDY Model 200==
coming
Model 200 system rom spans 2 chips, 32k at M15, and 8k at M13. Only M15 needs to be modified.
 
:0x6DF1 0x31 -> 0x32
:0x6DF3 0x39 -> 0x30
 
[[file:TANDY_Model_200.M15.orig.bin]]<br>
[[file:TANDY_Model_200.M15.y2k.bin]]
 
[[file:TANDY_Model_200.M13.orig.bin]] (the 8k 2nd rom chip is not modified, included here just for completeness)
 
You can use a plain 27C256, or [[28C256_to_27C256]], or [[FlexROM_200]] (optionally with [[Building_a_REX|REX Classic]]) to install the patched rom.


==Olivetti M10==
==Olivetti M10==
Line 42: Line 60:
:0x5A5B 0x31 -> 0x32
:0x5A5B 0x31 -> 0x32
:0x5A5E 0x39 -> 0x30
:0x5A5E 0x39 -> 0x30
<!-- [[File:M10_System_ROM_NorthAmerica.orig.hex]] -->[[File:M10_System_ROM_NorthAmerica.orig.bin]]<br>
[[File:M10_System_ROM_NorthAmerica.orig.bin]]<br>
<!-- [[File:M10_System_ROM_NorthAmerica.y2k.hex]] -->[[File:M10_System_ROM_NorthAmerica.y2k.bin]]
[[File:M10_System_ROM_NorthAmerica.y2k.bin]]
 
Europe:
:0x5774 0x31 -> 0x32
:0x5779 0x39 -> 0x30
[[File:M10_System_ROM_EU.orig.bin]]<br>
[[File:M10_System_ROM_EU.y2k.bin]]


You can use an ordinary 27C256 UV Eprom, or one-time-programmable 27C256, or [[28C256_to_27C256]] to install the patched rom.
You can use a plain 27C256, or [[28C256_to_27C256]] to install the patched rom.


==Kyotronic KC-85==
==Kyotronic KC-85==
:0x575E 0x31 -> 0x32
:0x575E 0x31 -> 0x32
:0x5761 0x39 -> 0x30
:0x5761 0x39 -> 0x30
<!-- [[File:KC-85.orig.hex]] -->[[File:KC-85.orig.bin]]<br>
<!-- [[File:KC-85.orig.hex]] -->[[File:KC-85.orig.bin]]<br>
<!-- [[File:KC-85.y2k.hex]] -->[[File:KC-85.y2k.bin]]
<!-- [[File:KC-85.y2k.hex]] -->[[File:KC-85.y2k.bin]]
You can use a plain 27C256, or [[28C256_to_27C256]] to install the patched rom.


==NEC PC-8201A, PC-8300==
==NEC PC-8201A, PC-8300==
NEC has a second place that must be edited in addition to the same rule as all the rest.
To change the "19" in "1983", it's the same rule for NEC as all the rest, but there is also a second place to change the "83".<br>
 
:0x5D91 0x31 -> 0x32
:0x5D91 0x31 -> 0x32
:0x5D94 0x39 -> 0x30
:0x5D94 0x39 -> 0x30
:0x7E30 0x33 -> 0x31
:0x7E30 0x33 -> 0x30
:0x7E31 0x38 -> 0x30
:0x7E31 0x38 -> 0x30


Line 66: Line 94:
[[file:NEC_PC-8300.orig.bin]]<br>
[[file:NEC_PC-8300.orig.bin]]<br>
[[file:NEC_PC-8300.y2k.bin]]<br>
[[file:NEC_PC-8300.y2k.bin]]<br>
For PC-8300 you can use [[FlashROM_8300]] to install the patched rom.
For PC-8300 you can use [[FLASH_23C1000]] to install the patched rom.


=References=
=References=
http://www.muppetlabs.com/~chris/model100/y2000.html<br>
http://www.muppetlabs.com/~chris/model100/y2000.html<br>
https://www.web8201.net/default.asp?content=NECY2K.asp
https://www.web8201.net/default.asp?content=NECY2K.asp

Latest revision as of 01:09, 11 January 2023

"Model T computer" system rom Y2K patches

General

All the KC-85 clones have the same routine holding the century digits, though appearing at different addresses in different system roms.

A Y2K patching rule that applies the same to all machines is to just search for a certain string of bytes wherever it happens to appear, and edit.

Using the hex-editor of your choice:

Search for this sequence: 23 36 31 23 36 39
Replace it with this: 23 36 32 23 36 30

TRS-80 Model 100

0x5A53 0x31 -> 0x32
0x5A56 0x39 -> 0x30

File:TRS-80 Model 100.orig.bin
File:TRS-80 Model 100.y2k.bin

Most Model 100's have a non-standard pinout for the system rom socket.
If your original system rom has the part number LH535618 (most will), then you can use FlexROM_100 (optionally with REX Classic) to install the patched ROM.

If you have a late model without LH535618, then you can use a plain 27C256, or FlexROM_102 (optionally with REX Classic), or 28C256_to_27C256.

TANDY Model 102

US

0x5A53 0x31 -> 0x32
0x5A56 0x39 -> 0x30

File:TANDY Model 102.us.orig.bin
File:TANDY Model 102.us.y2k.bin

UK

0x5A53 0x31 -> 0x32
0x5A56 0x39 -> 0x30

File:TANDY Model 102.uk.orig.bin
File:TANDY Model 102.uk.y2k.bin

You can use a plain 27C256, or FlexROM_102 (optionally with REX Classic), or 28C256_to_27C256 to install the patched rom.

TANDY Model 200

Model 200 system rom spans 2 chips, 32k at M15, and 8k at M13. Only M15 needs to be modified.

0x6DF1 0x31 -> 0x32
0x6DF3 0x39 -> 0x30

File:TANDY Model 200.M15.orig.bin
File:TANDY Model 200.M15.y2k.bin

File:TANDY Model 200.M13.orig.bin (the 8k 2nd rom chip is not modified, included here just for completeness)

You can use a plain 27C256, or 28C256_to_27C256, or FlexROM_200 (optionally with REX Classic) to install the patched rom.

Olivetti M10

North America:

0x5A5B 0x31 -> 0x32
0x5A5E 0x39 -> 0x30

File:M10 System ROM NorthAmerica.orig.bin
File:M10 System ROM NorthAmerica.y2k.bin

Europe:

0x5774 0x31 -> 0x32
0x5779 0x39 -> 0x30

File:M10 System ROM EU.orig.bin
File:M10 System ROM EU.y2k.bin

You can use a plain 27C256, or 28C256_to_27C256 to install the patched rom.

Kyotronic KC-85

0x575E 0x31 -> 0x32
0x5761 0x39 -> 0x30

File:KC-85.orig.bin
File:KC-85.y2k.bin

You can use a plain 27C256, or 28C256_to_27C256 to install the patched rom.

NEC PC-8201A, PC-8300

To change the "19" in "1983", it's the same rule for NEC as all the rest, but there is also a second place to change the "83".

0x5D91 0x31 -> 0x32
0x5D94 0x39 -> 0x30
0x7E30 0x33 -> 0x30
0x7E31 0x38 -> 0x30

File:NEC PC-8201A.orig.bin
File:NEC PC-8201A.y2k.bin
For PC-8201/PC8201A you can use a plain 27C256 or a 28C256_to_27C256 to install the patched rom.

File:NEC PC-8300.orig.bin
File:NEC PC-8300.y2k.bin
For PC-8300 you can use FLASH_23C1000 to install the patched rom.

References

http://www.muppetlabs.com/~chris/model100/y2000.html
https://www.web8201.net/default.asp?content=NECY2K.asp

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