Topic revived seventeen years later - we now have a better answer: https://ardent-tool.com/tech/ROM_BASIC.html

Complete 32 KB ROM BASIC, Inaccessible on Boot

Most IML systems:

PS/2 Model 76/77 (w/ "Bermuda" planar)
PS/2 Model 90/95 w/ Type 1 Processor Complex
PS/2 Model 90/95 w/ Type 2 Processor Complex
and more...

So. Inaccessible on Boot. So, how do we access it?

IBMMuseum wrote:
> Topic revived seventeen years later - we now have a better answer: https://ardent-tool.com/tech/ROM_BASIC.html
>

> Complete 32 KB ROM BASIC, Inaccessible on Boot
>
> Most IML systems:
>
> PS/2 Model 76/77 (w/ "Bermuda" planar)
> PS/2 Model 90/95 w/ Type 1 Processor Complex
> PS/2 Model 90/95 w/ Type 2 Processor Complex
> and more...
>
> So. Inaccessible on Boot. So, how do we access it?

BASIC/BASICA from DOS?...

https://www.atarimagazines.com/compute/issue78/003_4_Readers_Feedback_IBM_BASIC_Versions.php

You can tell what version of BASIC you're using by looking at the
version identifier in the BASIC startup message. The identifier C stands
for cassette; D stands for disk; A stands for advanced BASIC; and J
stands for cartridge BASIC (the J signifies junior). Some versions of
IBM BASIC have gone through one or more revisions. The number after the
identifier tells you which revision you are using. For instance,
cassette BASIC on the PCjr is Version C1.20, while the PCjr's cartridge
BASIC identifies itself as Version Jl.OO, indicating that cassette BASIC
was revised twice but cartridge BASIC has not yet been revised.

IBMMuseum wrote:
>> Complete 32 KB ROM BASIC, Inaccessible on Boot
>>
>> Most IML systems:
>>
>> PS/2 Model 76/77 (w/ "Bermuda" planar)
>> PS/2 Model 90/95 w/ Type 1 Processor Complex
>> PS/2 Model 90/95 w/ Type 2 Processor Complex
>> and more...
>>
>> So. Inaccessible on Boot. So, how do we access it?
>
> BASIC/BASICA from DOS?...
>

> https://www.atarimagazines.com/compute/issue78/003_4_Readers_Feedback_IBM_BASIC_Versions.php
>
> You can tell what version of BASIC you're using by looking at the
> version identifier in the BASIC startup message. The identifier C stands
> for cassette; D stands for disk; A stands for advanced BASIC; and J
> stands for cartridge BASIC (the J signifies junior). Some versions of
> IBM BASIC have gone through one or more revisions. The number after the
> identifier tells you which revision you are using. For instance,
> cassette BASIC on the PCjr is Version C1.20, while the PCjr's cartridge
> BASIC identifies itself as Version Jl.OO, indicating that cassette BASIC
> was revised twice but cartridge BASIC has not yet been revised.

Interesting - I hear the die-hards call ROM-BASIC as "Cassette BASIC" even when it is not on the IBM PC (the only IBM system with a cassette port). This information should be incorporated on the page.

> while the PCjr's cartridge BASIC identifies itself as Version Jl.OO,

I suppose J1.00 is more likely (OCR-hiccup??)

--
Jelte,
Admirer of the letter of IBM with blue Ishiki

> > while the PCjr's cartridge BASIC identifies itself as Version Jl.OO,
> I suppose J1.00 is more likely (OCR-hiccup??)

The article is archived in italic, and probably had an OCR error with the original (it is pre-PS/2, in 1986)...

Dave, that article is in a lot of places.

IBMMuseum wrote:
>>> while the PCjr's cartridge BASIC identifies itself as Version Jl.OO,
>> I suppose J1.00 is more likely (OCR-hiccup??)
>
> The article is archived in italic, and probably had an OCR error with the original (it is pre-PS/2, in 1986)...
>

On 22-11-2023 01:17, Louis Ohland wrote:
> Dave, that article is in a lot of places.
>
> IBMMuseum wrote:
>>>> while the PCjr's cartridge BASIC identifies itself as Version Jl.OO,
>>> I suppose J1.00 is more likely (OCR-hiccup??)
>>
>> The article is archived in italic, and probably had an OCR error with the original (it is pre-PS/2, in 1986)...
>>

Do they all say Jl.OO ? Maybe OCR was correct after all, but it sure would be strange, though...
(or maybe the programmer was a *very* early fan of J-LO ;)

--
Jelte,
Admirer of the letter of IBM with blue Ishiki

On 22.11.2023 10:30, JWR wrote:
> On 22-11-2023 01:17, Louis Ohland wrote:
>> Dave, that article is in a lot of places.
>>
>> IBMMuseum wrote:
>>>>> while the PCjr's cartridge BASIC identifies itself as Version Jl.OO,
>>>> I suppose J1.00 is more likely (OCR-hiccup??)
>>>
>>> The article is archived in italic, and probably had an OCR error with
>>> the original (it is pre-PS/2, in 1986)...
>>>
>
> Do they all say Jl.OO ? Maybe OCR was correct after all, but it sure
> would be strange, though...
> (or maybe the programmer was a *very* early fan of J-LO ;)

Info added:
https://ardent-tool.com/tech/ROM_BASIC.html#Versions
(link to the original article in the Further Reading section)

And yeah, Jl.OO is an OCR error. Just to be 100% sure I czeched the ROM
image... (available here for those interested:
http://retrograde.inf.ua/pcjr.htm)