HP-41 RAMBox Questions

[Sylvain Cote]

Hello Raymond,

(02-18-2020 09:12 PM)Raymond Del Tondo Wrote:  A small correction to your description of PG<> :
According to the manual PG<> switches between RAMBOX 0 and RAMBOX 1, so if page 8 contains RBOS-"a", all pages are switched to the "b" after issuing PG<> , regardless whether banks were interleaved before or not.

You are right and I was mistaken.

I just did the following test on my HP-41CY that proves what you have said.

Activate RAMBOX a/0 non-interleave

Code:

PG<>
CAT 2                                    // if shows "-RAMBOX 64b" then do another: PG<>

Create odd and even modules in RAMBOX a/0

Code:

CAT 2                                    // shows "-RAMBOX 64a"
11  ENTER  "-TEST-AO"  INITPG  CAT 2     // shows "-RAMBOX 64a" ... "-TEST-AO"
12  ENTER  "-TEST-AE"  INITPG  CAT 2     // shows "-RAMBOX 64a" ... "-TEST-AO" ... "-TEST-AE"

Create odd and even modules in RAMBOX b/1

Code:

PG<>
CAT 2                                    // shows "-RAMBOX 64b"
13  ENTER  "-TEST-BO"  INITPG  CAT 2     // shows "-RAMBOX 64b" ... "-TEST-BO"
14  ENTER  "-TEST-BE"  INITPG  CAT 2     // shows "-RAMBOX 64b" ... "-TEST-BO" ... "-TEST-BE"

Switch RAMBOX a and b between interleaved and non-interleaved modes:

Code:

PG<>
CAT 2                                    // shows "-RAMBOX 64a" ... "-TEST-AO" ... "-TEST-AE"
PG01
CAT 2                                    // shows "-RAMBOX 64a" ... "-TEST-BO" ... "-TEST-AE"  // reordered for easy reading
PG10
CAT 2                                    // shows "-RAMBOX 64b" ... "-TEST-AO" ... "-TEST-BE"

Code:

PG<>
CAT 2                                    // shows "-RAMBOX 64a" ... "-TEST-AO" ... "-TEST-AE"
PG<>
CAT 2                                    // shows "-RAMBOX 64b" ... "-TEST-BO" ... "-TEST-BE"

Cleanup

Code:

PG<>
CAT 2                                    // shows "-RAMBOX 64a" ... "-TEST-AO" ... "-TEST-AE"
12  CLPG  CAT 2                          // shows "-RAMBOX 64a" ... "-TEST-AO"
11  CLPG  CAT 2                          // shows "-RAMBOX 64a"

Code:

PG<>
CAT 2                                    // shows "-RAMBOX 64b" ... "-TEST-BO" ... "-TEST-BE"
14  CLPG  CAT 2                          // shows "-RAMBOX 64b" ... "-TEST-BO"
13  CLPG  CAT 2                          // shows "-RAMBOX 64b"

Sylvain