| Volex TTX2000 S Issue 1.2 | Routines |
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This routine is copied into the printer buffer to run so that this ROM can be paged out.
This routine replaces code from the OEL Issue 2.3 ROM.
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| page_out_to_basic | 1632 | LD A,$08 | Output $08 to control register to page out ROM (also disables AFC and switches to channel 1). | |
| 1634 | OUT ($7F),A | |||
| 1636 | LD HL,(telesoftware_RAMT) | Load address from telesoftware_RAMT and store in P-RAMT system variable (address of last byte of physical RAM). | ||
| 1639 | LD ($5CB4),HL | |||
| 163C | LD DE,$3EAF | Copy UDGs from BASIC ROM to the end of physical memory. | ||
| 163F | LD BC,$00A8 | |||
| 1642 | EX DE,HL | |||
| 1643 | LDDR | |||
| 1645 | EX DE,HL | Set UDG system variable. | ||
| 1646 | INC HL | |||
| 1647 | LD ($5C7B),HL | |||
| 164A | DEC HL | Set RASP system variable (length of warning buzz) to 64 and RAMTOP system variable below UDG. | ||
| 164B | LD BC,$0040 | |||
| 164E | LD ($5C38),BC | |||
| 1652 | LD ($5CB2),HL | |||
| 1655 | LD HL,$3C00 | Set CHARS system variable to $3C00 (256 bytes before BASIC ROM font data). | ||
| 1658 | LD ($5C36),HL | |||
| 165B | LD HL,($5CB2) | Reset stack below RAMTOP. | ||
| 165E | LD (HL),$3E | |||
| 1660 | DEC HL | |||
| 1661 | LD SP,HL | |||
| 1662 | DEC HL | Set ERR-SP system variable (Address of item on machine stack to use as error return). | ||
| 1663 | DEC HL | |||
| 1664 | LD ($5C3D),HL | |||
| 1667 | IM 1 | Switch to interrupt mode 1. | ||
| 1669 | LD IY,$5C3A | Set IY register to address of ERR-NR system variable. | ||
| 166D | EI | Enable interrupts. | ||
| 166E | LD HL,$5CB6 | Set CHANS system variable to CHINFO (address of channel information). | ||
| 1671 | LD ($5C4F),HL | Copy 21 bytes from CHANINFO to CHINFO system variable. | ||
| 1674 | LD DE,$15AF | |||
| 1677 | LD BC,$0015 | |||
| 167A | EX DE,HL | |||
| 167B | LDIR | |||
| 167D | EX DE,HL | Set DATADD system variable (Address of terminator of last DATA item) to end of channel info. | ||
| 167E | DEC HL | |||
| 167F | LD ($5C57),HL | |||
| 1682 | INC HL | Set PROG system variable to following address. | ||
| 1683 | LD ($5C53),HL | |||
| 1686 | LD HL,($5C61) | Set STKBOT and STKEND system variables to value of WORKSP system variable. | ||
| 1689 | LD ($5C63),HL | |||
| 168C | LD ($5C65),HL | |||
| 168F | LD A,$38 | Set ATTR-P, ATTR-T, and BORDCR system variables to black on white attributes. | ||
| 1691 | LD ($5C8D),A | |||
| 1694 | LD ($5C8F),A | |||
| 1697 | LD ($5C48),A | |||
| 169A | LD HL,$0523 | Initialize REPDEL and REPPER system variables. | ||
| 169D | LD ($5C09),HL | |||
| 16A0 | LD HL,$5C00 | Decrement KSTATE0 and KSTATE4. | ||
| 16A3 | DEC (HL) | |||
| 16A4 | LD HL,$5C04 | |||
| 16A7 | DEC (HL) | |||
| 16A8 | LD HL,$15C6 | Copy 14 bytes from STRMDATA to STRMS system variable (addresses of channels attached to streams). | ||
| 16AB | LD DE,$5C10 | |||
| 16AE | LD BC,$000E | |||
| 16B1 | LDIR | |||
| 16B3 | LD HL,$5C3B | Set bit 1 of FLAGS system variable (printer in use). | ||
| 16B6 | SET 1,(HL) | |||
| 16B8 | LD A,$02 | Set DF-SZ system variable (number of lower screen lines) to 2. | ||
| 16BA | LD ($5C6B),A | |||
| 16BD | LD A,$FF | Set ERR-NR system variable to $FF (error 0). | ||
| 16BF | LD ($5C3A),A | |||
| 16C2 | CALL $0D6B | Call $0D6B (CLS routine). | ||
| 16C5 | LD A,$07 | Set the border colour to white, and EAR and MIC bits low. | ||
| 16C7 | OUT ($FE),A | |||
| 16C9 | LD A,$00 | Call $1601 (CHAN-OPEN) to open stream 0 (channel 'K'). | ||
| 16CB | CALL $1601 | |||
| 16CE | JP $12CF | Jump to $12CF (MAIN_3) in the ROM main execution loop. | ||
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